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A novel heat-resistant Al–Si–Cu–Ni–Mg base material synergistically strengthened by Ni-rich intermetallics and nano-AlN_p microskeletons
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作者 Kaiqi Hu Qingfei Xu +3 位作者 Xia Ma Qianqian Sun Tong Gao Xiangfa Liu 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第3期306-312,共7页
In this work, nano-AlN particle(nano-AlN_p) microskeletons were introduced into an Al–Si–Cu–Ni–Mg alloy by Al–8 AlN master alloy in which the nano-AlN_p reinforcements connect with each other to form three-dimens... In this work, nano-AlN particle(nano-AlN_p) microskeletons were introduced into an Al–Si–Cu–Ni–Mg alloy by Al–8 AlN master alloy in which the nano-AlN_p reinforcements connect with each other to form three-dimensional networks. It is found that these nano-AlN_p microskeletons mainly distribute in the binary Al–Si eutectic zones resulting in flaky eutectic Si phases being modified to particulates. Meanwhile,the microskeletons strengthen the matrix synergistically with semi-continuous Ni-rich intermetallics in three dimensions. The tensile mechanical properties, micro-hardness and thermal expansion properties of the alloy at different temperatures are significantly improved. Especially, the ultimate tensile strength(UTS) at 350℃ increases from 85MPa to 106MPa, rising by 24.7%, which is ascribed to nano-AlN_p microskeletons assisting intermetallics with undertaking mechanical loading, and to the modification of eutectic Si phases to reduce the stress concentration at elevated temperatures. 展开更多
关键词 Al–Si ALLOY HEAT-RESISTANT AL ALLOY Mechanical properties at high temperatures Nano-AlN_p microskeletons
Preparation of Al-Zn-Mg-Cu alloy semisolid slurry through a water-cooled serpentine pouring channel
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作者 Wen-zhi Zhu Wei-min Mao +2 位作者 Qing-song Wei Chen Hui Yu-sheng Shi 《中国铸造:英文版》 SCIE 2019年第1期31-39,共9页
The semisolid slurry of Al-Zn-Mg-Cu alloy was prepared through a self-designed water-cooled copper serpentine pouring channel(WSPC) machine. Influences of pouring temperature, the number of turns and the cooling water... The semisolid slurry of Al-Zn-Mg-Cu alloy was prepared through a self-designed water-cooled copper serpentine pouring channel(WSPC) machine. Influences of pouring temperature, the number of turns and the cooling water flow rate on the microstructure of the semisolid Al-Zn-Mg-Cu alloy slurry were investigated. The results show that the semisolid Al-Zn-Mg-Cu alloy slurry with satisfactory quality can be generated by the WSPC when the pouring temperature is in the range between 680 ℃ and 700 ℃. At a given pouring temperature, the average grain size of primary α-Al decreases and the shape factor increases with the increase of the number of turns. When the cooling water flow rate is 450 L·h-1, the obtained semisolid slurry is optimal. During the preparation of the semisolid Al-Zn-Mg-Cu alloy slurry with low superheat pouring, the alloy melt has mixed inhibition and convection flow characteristics by 'self-stirring'. When the alloy melt flows through the serpentine channel, the chilling effect of the inner wall of the channel, the convection and mixed inhibition of the alloy melt greatly promote the heterogeneous nucleation and grain segregation. This effect destroys the dendrite growth mode under traditional solidification conditions, and the primary nuclei gradually evolve into spherical or nearspherical grains. 展开更多
关键词 Al-Zn-Mg-Cu Alloy SEMISOLID slurry WATER-COOLED SERPENTINE CHANNEL primary α-Al
Effect of vibration on seepage feeding during low-pressure casting of ZL205A alloy
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作者 Ru-jia Wang Shi-ping Wu Wei Chen 《中国铸造:英文版》 SCIE 2019年第1期40-45,共6页
Appropriate vibration can promote the feeding capacity of gravity casting, but the effect of vibration on the feeding of low-pressure casting is not clear. The effect of vibration on the seepage feeding of ZL205A allo... Appropriate vibration can promote the feeding capacity of gravity casting, but the effect of vibration on the feeding of low-pressure casting is not clear. The effect of vibration on the seepage feeding of ZL205A alloy was investigated by vibration casting experiment and physical simulation. The aqueous solution of sodium carboxymethyl cellulose(CMC) with the same rheological characteristic of metal melt was used. The results show that vibration can improve the feeding capacity and reduce shrinkage defects of ZL205A alloy in lowpressure casting. The orthogonal physical simulation experiments indicate that vibration with low frequency and great exerted force can significantly improve the seepage velocity of non-Newtonian fluid with solid particles in porous medium. The seepage phenomenon in CMC solution shows that vibration can change the structure of accumulated particles at the seepage entrance, and thus open the blocked feeding channel. The numerical simulation of one-dimensional semisolid fluid seepage reveals that vibration can form a wave field in the porous medium, which can reduce the adhesion force between fluid and capillary wall and destroy the boundary layer of fluid, and thus promote the seepage velocity. 展开更多
关键词 mechanical VIBRATION PHYSICAL simulation SEEPAGE ZL205A ALLOY
Design and motion testing of a Multiple SMA fin driven BIUV 预览
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作者 Yong-hua Zhang Jian-hui He Kinhuat Low 《水动力学研究与进展:英文版》 SCIE EI CSCD 2019年第1期124-136,共13页
Fishes interact with the fluid environment using various surfaces.These multiple control surfaces work in combination to produce the thrust and the balance torques in a steady swimming,to maneuver and to position them... Fishes interact with the fluid environment using various surfaces.These multiple control surfaces work in combination to produce the thrust and the balance torques in a steady swimming,to maneuver and to position themselves accurately even in turbulent flows.These motivate us to embark on a research program designed to develop an agile biologically inspired robotic fish based on the performance of multiple fins.To accomplish this goal,a mechanical ray-like fin actuated by the shape memory alloy (SMA) is developed,which can realize the oscillating motion,the undulating motion or even the complex three dimensional motion.The basic unit is the two opposite side SMA-driven plate,namely the fin ray.As a result,a lightweight bio-inspired fin is constructed by placing radially multiple SMA fin rays.A biologically inspired underwater vehicle (BIUV) is later built using the above multiple lightweight bio-inspired fins.Two common arrangement styles of multiple fins on the BIUV are considered here:one is the posterior fin (for the oscillating motion) that is parallel to the anterior fins (for the undulating motion),another one is the posterior fin that perpendicular to the anterior fins.The kinematic modeling,the deformation modeling and the detecting of the SMA fin are made.The thrust generation is also established.Finally,an experiment is conducted to test the performance of the proposed two arrangement styles,including the comparison of the averaged propulsion velocity and the averaged thrust under certain kinematic parameters.Meanwhile,the influence of the frequency and the amplitude of the SMA fin ray on the propulsion performance is also investigated. 展开更多
关键词 OSCILLATING undulating shape MEMORY alloy (SMA) biologically inspired UNDERWATER vehicle (BIUV) FIN RAY
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Single and double aging treatments on Mg97Zn1Y2 alloy
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作者 Di-qing Wan Ying-lin Hu +1 位作者 Hou-bin Wang Shu-ting Ye 《中国铸造:英文版》 SCIE 2019年第1期46-52,共7页
The development of magnesium alloys was limited due to the low absolute strength and poor corrosion resistance. It was found that the optimal performance could not be achieved in some alloys by a single quenching and ... The development of magnesium alloys was limited due to the low absolute strength and poor corrosion resistance. It was found that the optimal performance could not be achieved in some alloys by a single quenching and aging treatment, but could be achieved after a graded aging or multiple-stage aging heat treatment. The Mg97Zn1Y2 alloy was prepared and subjected to single and double aging treatments. Single aging was carried out at 250 ℃ for 6 to 15 h. For double aging, the first step was performed the same as the single aging. The second step was performed at 350 ℃ for 12 h. The microstructure and properties of the alloy with single and double aging were analyzed by means of hardness measurement, optical microscopy, scanning electron microscopy, X-ray diffraction, and polarization curve measurements. Results show that the precipitated nanoscale phases are formed during aging, and evenly distributed in the matrix. Compared with the single aging treatment, the hardness and corrosion resistance of the alloy are further improved due to the double aging treatment. 展开更多
关键词 SINGLE AGING DOUBLE AGING Mg97Zn1Y2 ALLOY LPSO PHASE
Effects of trace Cr on as-cast microstructure and microstructural evolution of semi-solid isothermal heat treatment ZC61 magnesium alloy
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作者 Xiao-feng Huang Ya-jie Ma +2 位作者 Qiao-qiao Zhang Lang-lang Wei Jian-qiao Yang 《中国铸造:英文版》 SCIE 2019年第1期53-62,共10页
The content and kind of trace elements in magnesium alloys have important effects on their ascast and semi-solid microstructures. In this research work, effects of trace Cr on as-cast and semi-solid microstructures of... The content and kind of trace elements in magnesium alloys have important effects on their ascast and semi-solid microstructures. In this research work, effects of trace Cr on as-cast and semi-solid microstructures of ZC61 magnesium alloy were investigated by metal mold casting and semi-solid isothermal heat treatment. The results show that the addition of Cr can refine the α-Mg phase without generating a new phase, noticeably change the eutectic phase, and decrease the average size of solid particles at the same isothermal heat treatment conditions. Non-dendritic microstructures of all alloys are constituted of α1-Mg phases, α2-Mg phases and eutectic phases after water quenching. With isothermal temperature increased or holding time prolonged, the eutectic microstructure(α-Mg+MgZn2+CuMgZn) at the grain boundaries in as-cast alloy is melted preferentially and then turned into semi-solid non-dendritic microstructure by processes of initial coarsening, microstructure separation, spheroidizing and final coarsening. Especially when the ZC61-0.1 Cr alloy was treated at 585 ℃ for 30 min, the ideal non-dendritic microstructure can be obtained, and the corresponding solid particle size and shape factor were 37.5 μm and 1.33, respectively. The coarsening process of solid α-Mg phase at higher temperature or longer time, which is affected by both combining growth and Ostwald ripening mechanism, is refrained when Cr is added to the ZC61 alloy. 展开更多
关键词 ZC61 magnesium alloy CR content SEMI-SOLID isothermal heat treatment NON-DENDRITIC microstructure MICROSTRUCTURAL evolution
Tunable Perpendicular Magnetic Anisotropy in Off-Stoichiometric Full-Heusler Alloy Co2MnAl
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作者 余之峰 鲁军 +5 位作者 王海龙 赵旭鹏 魏大海 马佳淋 毛思玮 赵建华 《中国物理快报:英文版》 SCIE CAS CSCD 2019年第6期79-82,共4页
Off-stoichiometric full-Heusler alloy Co2 MnAl thin films with different thicknesses are epitaxially grown on GaAs(001) substrates by molecular-beam epitaxy. The composition of the films, close to Co1.65Mn1.35Al(CMA),... Off-stoichiometric full-Heusler alloy Co2 MnAl thin films with different thicknesses are epitaxially grown on GaAs(001) substrates by molecular-beam epitaxy. The composition of the films, close to Co1.65Mn1.35Al(CMA),is determined by x-ray photoelectron spectroscopy and energy dispersive spectroscopy. Tunable perpendicular magnetic anisotropy(PMA) from 3.41 Merg/cm^3 to 1.88 Merg/cm^3 with the thickness increasing from 10 nm to 30 nm is found,attributed to the relaxation of residual compressive strain. Moreover, comparing with the ultrathin CoFeB/MgO used in the conventional perpendicular magnetic tunnel junction, the CMA electrode has a higher magnetic thermal stability with more volume involved. The PMA in CMA films is sustainable up to 300℃,compatible with semiconductor techniques. This work provides a possibility for the development of perpendicular magnetized full-Heusler compounds with high thermal stability and spin polarization. 展开更多
关键词 TUNABLE PERPENDICULAR Magnetic ANISOTROPY Full-Heusler Alloy Co2MnAl different thicknesses
Hot compression deformation behavior of biomedical Ni-Ti alloy
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作者 Zhen Wang Xiao-Wen Xu Bing Zhang 《稀有金属:英文版》 SCIE EI CAS CSCD 2019年第7期609-619,共11页
Biomedical Ti-55.78 (wt%) Ni alloy samples were prepared by vacuum induction melting, and their hot compression deformation behavior was studied in the deformation temperature range of 750-950℃, the strain rate range... Biomedical Ti-55.78 (wt%) Ni alloy samples were prepared by vacuum induction melting, and their hot compression deformation behavior was studied in the deformation temperature range of 750-950℃, the strain rate range of 0.001-1.000 s^-1 and the true strain range of 0.1 -0.7. The constitutive equation of the as-cast biomedical Ni-Ti alloy was established based on the Arrhenius constitutive model, and error analysis of the constitutive equation was carried out. The processing zone and unstable thermal deformation zone of the as-cast biomedical Ni-Ti alloy were obtained by establishing hot processing maps based on a dynamic material model. The results showed that deformation temperature and strain rate were the main factors affecting the flow stress. The results of error verification of the constitutive equation show that the predicted flow stress curves agree well with the measured ones. Therefore, the constitutive equation based on Arrhenius can accurately predict the high temperature flow stress of as-cast biomedical Ni-Ti alloy. The optimum parameters for forging process of biomedical Ni-Ti alloy are the strain rate less than 0.003 s^-1 and the hot deformation temperature range of 930-950℃. 展开更多
关键词 BIOMEDICAL NI-TI ALLOY HOT compression deformation Constitutive equation HOT processing map
Corrosion resistance of Mg(OH)2/Mg-Al-layered double hydroxide coatings on magnesium alloy AZ31: influence of hydrolysis degree of silane
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作者 Qing-Song Yao Zhong-Chao Li +5 位作者 Zai-Meng Qiu Fen Zhang Xiao-Bo Chen Dong-Chu Chen Shao-Kang Guan Rong-Chang Zeng 《稀有金属:英文版》 SCIE EI CAS CSCD 2019年第7期629-641,共13页
Mg(OH)2/Mg-Al-layered double hydroxide (LDH) coatings were modified with methyltrimethoxysilane (MTMS) on magnesium alloys. Effect of hydrolysis degree of silane solution on coating formation was investigated. Chemica... Mg(OH)2/Mg-Al-layered double hydroxide (LDH) coatings were modified with methyltrimethoxysilane (MTMS) on magnesium alloys. Effect of hydrolysis degree of silane solution on coating formation was investigated. Chemical compositions and surface morphologies of the coatings were examined using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and field-emission scanning electronic microscopy (FESEM). Results indicated that the composite coatings consisted of polymethyltrimethoxysilane (PMTMS), LDH and Mg(OH)2. Electrochemical and hydrogen evolution measurements revealed that the composite coatings possessed good corrosion resistance, especially the ones prepared in a high hydrolysis degree of silane. The optimum corrosion resistance of the composite coati ng was LDH/PMTMS-3 coating, which had the lowest value of corrosion current density (5.537×10^-9 A·cm^-2) and a dense surface.Plausible mechanism for coating formation and corrosion process of MTMS-modified Mg(OH)2/Mg-Al-LDH coatings were discussed. 展开更多
关键词 Magnesium alloy Layered double HYDROXIDE (LDH) SILANE Coating Corrosion resistance
Influence of Reaction Time on Growth Behaviours of Mg-Al LDH Films 预览
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作者 WU Liang CHEN Jing +5 位作者 ZHANG Sheng TANG Ai-tao YANG Dan-ni ZHANG Gen LIU Lei PAN Fu-sheng 《表面技术》 EI CAS CSCD 北大核心 2019年第3期19-26,共8页
Mg-Al LDH film was fabricated on anodized magnesium alloy AZ31 by in-situ growth method.The characteristics of the film were investigated by X-ray diffraction(XRD),Fourier transform infrared(FT-IR),scanning electron m... Mg-Al LDH film was fabricated on anodized magnesium alloy AZ31 by in-situ growth method.The characteristics of the film were investigated by X-ray diffraction(XRD),Fourier transform infrared(FT-IR),scanning electron microscopy(SEM)observation and electrochemical tests.The results showed that the crystallinity of LDH film was increased with reaction time.When the reaction time was more than 12 h,the LDH film had complete crystal layered structure.The anodic oxide film was sealed basically by the growth of LDH nanosheets after 6 h reaction.The corrosion resistance of the films became better with the increasing of reaction time.However,after 12 h reaction,the corrosion resistance of the film decreased.The formation behavior of the Mg-Al LDH film was proposed.That the competitive growth of LDH grains,which contains dissolution and recrystallization,was proposed to explain the change of the growth and corrosion resistance of the Mg-Al LDH film. 展开更多
关键词 magnesium alloy corrosion resistance in-situ GROWTH LAYERED double hydroxide(LDH) reaction time
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A promising new class of irradiation tolerant materials:Ti2ZrHfV0.5Mo0.2 high-entropy alloy
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作者 Yiping Lu Hefei Huang +9 位作者 Xuzhou Gao Cuilan Ren Jie Gao Huanzhi Zhang Shijian Zheng Qianqian Jin Yonghao Zhao Chenyang Lu Tongmin Wang Tingju Li 《材料科学技术学报:英文版》 SCIE EI CAS CSCD 2019年第3期369-373,共5页
Recently, high-entropy alloys(HEAs) or multi-principal-element alloys with unprecedented physical,chemical, and mechanical properties, have been considered as candidate materials used in advanced reactors due to their... Recently, high-entropy alloys(HEAs) or multi-principal-element alloys with unprecedented physical,chemical, and mechanical properties, have been considered as candidate materials used in advanced reactors due to their promising irradiation resistant behavior. Here, we report a new single-phase bodycentered cubic(BCC) structured Ti2 ZrHfV0.5Mo0.2 HEA possessing excellent irradiation resistance, i.e.,scarcely irradiation hardening and abnormal lattice constant reduction after helium-ion irradiation,which is completely different from conventional alloys. This is the first time to report the abnormal XRD phenomenon of metallic alloys and almost no hardening after irradiation. These excellent properties make it to be a potential candidate material used as core components in next-generation nuclear reactors. The particular irradiation tolerance derives from high density lattice vacancies/defects. 展开更多
关键词 High-entropy alloy IRRADIATION resistance MICROSTRUCTURAL characterization DEFECTS evolution
Influence of solution treatment on microstructure, corrosion resistance, and oxidation behavior of cast G-NiCr28W alloy
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作者 Alptekin Kisasoz 《中国铸造:英文版》 SCIE 2019年第1期63-70,共8页
G-NiCr28W is a nickel-based cast alloy. Its microstructure consists of nickel-rich matrix phase and chromium-rich eutectic carbides. The solution treatment process can provide homogenous microstructure and desired mec... G-NiCr28W is a nickel-based cast alloy. Its microstructure consists of nickel-rich matrix phase and chromium-rich eutectic carbides. The solution treatment process can provide homogenous microstructure and desired mechanical/thermal properties for G-NiCr28W alloy. However, the solution treatment process affects the corrosion resistance of the alloy and it causes metal loss due to the occurrence of oxidation at atmospheric conditions. Therefore, determining the changes in the properties of the G-NiCr28W is important. For this purpose, G-NiCr28W specimens were solution treated at 1,040 ℃, 1,100 ℃ and 1,160 ℃ for 1 h and 8 h, respectively. The microstructures of the solution-treated samples were characterized by optical microscopy, scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction analysis. Moreover, hardness, corrosion resistance and oxidation behaviors of the solution-treated samples were examined. The solution treatment process applied at 1,160 ℃ led to the formation of Fe2W2C blocky carbides, and hardness of the sample increased with the existence of blocky carbides, while corrosion resistance decreased. Furthermore, excessive metal loss occurred depending on oxidation due to the high process temperature at 1,160 ℃. 展开更多
关键词 G-NiCr28W nickel-based ALLOY heat treatment corrosion behaviour OXIDATION
Microstructure and mechanical properties of A356 alloy with yttrium addition processed by hot extrusion
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作者 Zhifan Wei Yushun Lei +2 位作者 Hong Yan Xihao Xu Jiajia He 《中国稀土学报:英文版》 SCIE EI CAS CSCD 2019年第6期659-667,共9页
The effects of the rare earth element yttrium(Y) and hot extrusion on the microstructure and mechanical properties of A356 alloy were investigated by mechanical properties testing and microstructure observation. The r... The effects of the rare earth element yttrium(Y) and hot extrusion on the microstructure and mechanical properties of A356 alloy were investigated by mechanical properties testing and microstructure observation. The results indicate that the addition of Y improves the microstructure of the as-cast alloy. The distribution of primary α-Al is uniform and orderly. The long needle-like eutectic Si phases and β-Fe phases turn to strips and short rods. When the content of Y increases to 0.2 wt%, the mean diameter of aAl(40.3 μm) and the aspect ratio of the eutectic Si phase(2.3) reach the minimum values, which are68.9% and 86.1% lower, respectively, than that of the alloy without Y addition. Under extrusion stress, the shape of the eutectic Si phase is changed from long rod-like to near grain-like after solution treatment.The size of the eutectic Si phase is significantly reduced. The needle-like β-Fe phases are squeezed and broken. The mechanical properties of the as-extruded alloy are significantly improved compared to the as-cast alloy. When the rare earth content is 0.2 wt%, the ultimate tensile strength, hardness and elongation of the alloy reach the maximum values, which are 328.2 MPa, 110.4 HV and 21.3%, respectively, and increase by 42.01%, 37.71% and 481.91%, respectively, in comparison to the as-cast alloy without Y addition. 展开更多
关键词 A356 alloy with Y ADDITION Micro structure Mechanical properties Hot EXTRUSION RARE earths
插线板用高抗冲阻燃耐热PET/PC合金的制备 预览
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作者 徐星驰 张伟 吴玉成 《工程塑料应用》 CAS CSCD 北大核心 2019年第6期20-25,共6页
采用双螺杆挤出机熔融共混挤出制备了聚对苯二甲酸乙二酯/聚碳酸酯(PET/PC)合金。研究了PET和PC黏度对合金力学性能、耐热性能、阻燃性能的影响。结果表明,PC树脂的黏度不会影响PET的结晶行为,且PC树脂的黏度越大,合金的力学性能和耐热... 采用双螺杆挤出机熔融共混挤出制备了聚对苯二甲酸乙二酯/聚碳酸酯(PET/PC)合金。研究了PET和PC黏度对合金力学性能、耐热性能、阻燃性能的影响。结果表明,PC树脂的黏度不会影响PET的结晶行为,且PC树脂的黏度越大,合金的力学性能和耐热性能越好。中黏PET的结晶度高有利于提高合金的耐热性能,但是会降低合金的韧性。选用高黏PET和高黏PC的组合可以得到高韧性、高耐热的合金。酯交换抑制剂的加入可以抑制PET和PC之间的酯交换反应,使得合金的球压痕直径减小。但是过多的酯交换抑制剂会降低材料的韧性,当酯交换抑制剂添加量超过0.6份后,合金的悬臂梁缺口冲击强度降低至23kJ/m^2以下。加入少量的扩链剂可以提高合金的力学性能。在增容剂、阻燃剂等加工助剂一定的情况下,基体树脂选用高黏PET和高黏PC,并加入0.4份酯交换抑制剂、0.2份扩链剂,此时合金的综合性能最好,缺口冲击强度达到62kJ/m^2,球压痕直径为1.9mm,满足插线板的国家标准要求。 展开更多
关键词 聚对苯二甲酸乙二酯 聚碳酸酯 合金 高抗冲 耐热 阻燃
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Azo dye degradation behavior of AlFeMnTiM(M=Cr,Co,Ni)high-entropy alloys 预览
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作者 Shi-kai Wu Ye Pan +2 位作者 Ning Wang Tao Lu Wei-ji Dai 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2019年第1期124-132,共9页
Because of the potential carcinogenic effects and difficult degradation of azo dyes,their degradation has been a longstanding problem.The degradation of azo dye Direct Blue 6(DB6)using ball-milled(BM)high-entropy allo... Because of the potential carcinogenic effects and difficult degradation of azo dyes,their degradation has been a longstanding problem.The degradation of azo dye Direct Blue 6(DB6)using ball-milled(BM)high-entropy alloy(HEA)powders was characterized in this work.Newly designed AlFeMnTiM(M=Cr,Co,Ni)HEAs synthesized by mechanical alloying(MA)showed excellent performance in the degradation of azo dye DB6.The degradation efficiency of AlFeMnTiCr is approximately 19 times greater than that of the widely used commercial Fe–Si–B amorphous alloy ribbons and more than 100 times greater than that of the widely used commercial zero-valent iron(ZVI)powders.The galvanic-cell effect and the unique crystal structure are responsible for the good degradation performance of the BM HEAs.This study indicates that BM HEAs are attractive,valuable,and promising environmental catalysts for wastewater contaminated by azo dyes. 展开更多
关键词 high ENTROPY ALLOY mechanical ALLOYING AlFeMnTiM DEGRADATION performance AZO DYE
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Single-phase high-entropy intermetallic compounds(HEICs): bridging high-entropy alloys and ceramics
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作者 Naixie Zhou Sicong Jiang +3 位作者 Timothy Huang Mingde Qin Tao Hu Jian Luo 《科学通报:英文版》 SCIE EI CSCD 2019年第12期856-864,共9页
High-entropy intermetallic compounds(HEICs)were fabricated by mechanical alloying and spark plasma sintering to fill a knowledge gap between the traditional high-entropy alloys(HEAs)and emerging highentropy ceramics(H... High-entropy intermetallic compounds(HEICs)were fabricated by mechanical alloying and spark plasma sintering to fill a knowledge gap between the traditional high-entropy alloys(HEAs)and emerging highentropy ceramics(HECs).Notably,several four-or five-component equimolar aluminides,such as the B2-phase(Fe1/5 Co1/5 Ni1/5 Mn1/5 Cu1/5)Al,have been made into single-phase HEICs for the first time.Thermodynamic modeling and a reversible,temperature-dependent,phase-stability experiment suggest that such B2-phase HEICs are entropy-stabilized phases.The structure of these HEICs resembles that of HECs with high-entropy mixing of fo ur or five elements of nearly equal fractions in one and only one sublattice,but with significant(10%)anti-site defects(differing from typical HECs).A new phase stability rule for forming single B2-phase HEICs is proposed.Five additional HEICs of predominantly D022 phases have also been made.This study broadens the families of equimola r,single-phase,high-entropy materials that have been successfully fabricated. 展开更多
关键词 High-entropy INTERMETALLIC compound Aluminide Phase stability High-entropy alloy High-entropy CERAMIC
Role of Cu element in biomedical metal alloy design
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作者 Er-Lin Zhang Shan Fu +7 位作者 Ruo-Xian Wang Hai-Xia Li Ying Liu Zhi-Qiang Ma Guang-Kun Liu Chen-Shun Zhu Gao-Wu Qin Da-Fu Chen 《稀有金属:英文版》 SCIE EI CAS CSCD 2019年第6期476-494,共19页
Biomedical metals are widely used as implant materials in the human or animal body to repair organs and restore function, such as heart valves, meninges, peritoneum and artificial organs.Alloying element affects the m... Biomedical metals are widely used as implant materials in the human or animal body to repair organs and restore function, such as heart valves, meninges, peritoneum and artificial organs.Alloying element affects the microstructure, mechanical property, corrosion resistance and wear resistance, but also influences the antibacterial and biological activity.Recently, antibacterial metal alloys have shown great potential as a new kind of biomedical materials, in which Cu has been widely used as antibacterial agent element.In addition, biodegradable metal alloys, including magnesium alloy and zinc alloy, also have attracted much attention worldwide.Cu was also used as alloying element to adjust the degradation rate.Thus, the role of Cu in the alloy design will be very important for the development of new alloy.In this paper, we summarized the recent research results on the Cu-containing metal alloy for biomedical application and hoped that this review would give more suggestions for the further development of biomedical metal alloy. 展开更多
关键词 CU BIOMEDICAL metal alloy Corrosion resistance ANTIBACTERIAL PROPERTY BIOLOGICAL PROPERTY
Biocorrosion properties of Ti–3Cu alloy in F ion-containing solution and acidic solution and biocompatibility
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作者 Dian-Geng Cai Mian-Mian Bao +5 位作者 Xiao-Yan Wang Lei Yang Gao-Wu Qin Ren-Xian Wang Da-Fu Chen Er-Lin Zhang 《稀有金属:英文版》 SCIE EI CAS CSCD 2019年第6期503-511,共9页
Ti–3Cu alloy has shown low melting point and strong antibacterial properties against S.aureus and E.coli and thus has potential application as dental materials and orthopedic application.In this paper, the corrosion ... Ti–3Cu alloy has shown low melting point and strong antibacterial properties against S.aureus and E.coli and thus has potential application as dental materials and orthopedic application.In this paper, the corrosion properties of Ti–3Cu alloy in five kinds of simulated solutions were investigated in comparison with cp-Ti(commercially pure titanium) by electrochemical technology and immersion experiment.Electrochemical results have demonstrated that Ti–3Cu alloy exhibited much nobler corrosion potential, lower corrosion current density and high corrosion resistance than cp-Ti in all solutions, especially in saliva-pH6.8+0.2 F and saliva-pH3.5, indicating that Ti–3Cu alloy has much better anticorrosion properties than cpTi.Immersion results have shown that Ti ion and Cu ion were released from Ti–3Cu, especially in saliva-pH6.8+0.2 F and saliva-pH3.5 solutions.Both electrochemical data and immersion results have indicated that high corrosion rate and high metal ion release rate were detected in F ion-containing solution and low-pH solution, displaying that F~- and low pH had much strong aggressive attack to cp-Ti and Ti–3Cu alloy.The corroded surface morphology was observed by scanning electron microscopy(SEM), and the roughness was tested in the end.The good corrosion resistance of antibacterial Ti–3Cu alloy suggests its great potential as a long-term biomedical application. 展开更多
关键词 TI alloy Corrosion resistance Ion release Antibacterial material
Corrosion resistance of nanostructured magnesium hydroxide coating on magnesium alloy AZ31: influence of EDTA
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作者 Xiao-Li Fan Yuan-Fang Huo +5 位作者 Chang-Yang Li M.Bobby Kannan Xiao-Bo Chen Shao-Kang Guan Rong-Chang Zeng Quan-Li Ma 《稀有金属:英文版》 SCIE EI CAS CSCD 2019年第6期520-531,共12页
A hexagonal nanosheet Mg(OH)2 coating was prepared through a one-step hydrothermal method using LiOH solution as mineralizer and then modified by ethylenediaminetetraacetic acid(EDTA) to minimize the rapid corrosion o... A hexagonal nanosheet Mg(OH)2 coating was prepared through a one-step hydrothermal method using LiOH solution as mineralizer and then modified by ethylenediaminetetraacetic acid(EDTA) to minimize the rapid corrosion of AZ31 Mg alloy.The performance of the coating was evaluated using electrochemical technique,hydrogen evolution measurements, nanoscratch test,Fourier-transform infrared spectroscopy(FTIR), X-ray diffraction(XRD) patterns and field-emission scanning electron microscopy(FESEM).The results suggested that the corrosion rate of bare AZ31 Mg alloys was significantly reduced by one and two orders of magnitude through the protection from Mg(OH)2 coating and modification with EDTA(i.e., EDTA-Mg(OH)2 coating), respectively.FESEM micrographs indicated that the modification in EDTA elicits to the formation of an EDTA-Mg(OH)2 composite with a thickness as twice as that of as-prepared Mg(OH)2 coating.Nanoscratch tests revealed strong adhesion between the composite or Mg(OH)2 coating and the substrate.The study of formation and corrosion mechanisms of the coatings manifested that Mg(OH)2 was first formed near the intermetallic compound AlMn particles and gradually covered the entire surface, wherein the AlMn particles played an important role in the coating growth process.And it also proved that EDTA accelerated the formation of Mg(OH)2. 展开更多
关键词 Corrosion resistance MAGNESIUM alloy MAGNESIUM HYDROXIDE EDTA INTERMETALLIC compound
Corrosion behavior of Ce-doped Ni-10Cu-11Fe-6Al(wt%) inert anode in molten CaCl2 salt
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作者 Mehdi Alzamani Kourosh Jafarzadeh Arash Fattah-alhosseini 《中国稀土学报:英文版》 SCIE EI CAS CSCD 2019年第2期218-224,共7页
In this research the effect of cerium dopingon corrosion behavior of Ni-10 Cu-11 Fe-6 Al(wt%) alloy as a novel inert anode in titanium electrolytic production was investigated. The samples, including un-doped and Ce-d... In this research the effect of cerium dopingon corrosion behavior of Ni-10 Cu-11 Fe-6 Al(wt%) alloy as a novel inert anode in titanium electrolytic production was investigated. The samples, including un-doped and Ce-doped nickel-based alloys, were prepared using vacuum induction melting(VIM) process and then exposed to the electrolysis in molten calcium chloride at 900C at à1.6 V versus graphite reference electrode for different immersion time. The surface and cross-section of the samples were characterized using scanning electron microscopy(SEM), and their electrochemical behavior was investigated by electrochemical impedance spectroscopy(EIS). The results show that the un-doped samples have greater number of voids and porosities as compared to that of the 0.0064 wt% Ce-doped samples(as the optimum content of cerium in the alloy). Thus, the nickel-based alloy becomes less sensitive to the pitting by addition of cerium. The corrosion penetration depth reaches about 244 mm after 16 h of electrolysis in the un-doped sample, while was approximately 103 mm for the 0.0064 wt% Ce-doped sample, which is an indication that the corrosion penetration depth decreases by adding small amounts of Ce. 展开更多
关键词 Ni-10Cu-11Fe-6Al Ce doping Corrosion behavior MOLTEN CACL2 SALT Nickel-based alloy Rare earths
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