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微量元素添加对Ti1100合金的高温抗氧化及耐蚀性能影响

Effects of Minor Additions of Elements into Ti1100 on Elevated Temperature Oxidation- and Corrosion-Resistance
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摘要 利用固溶体合金中的"团簇加连接原子"模型解析了典型高温近α-Ti合金Ti1100的成分,其团簇成分式为[Al-(Ti13.7Zr0.3](Al0.69Sn0.18Mo0.03Si0.12。在此基础上,采用相似元素替代原则设计了微量元素Hf、Ta和Nb添加的系列合金成分,即[Al-(Ti13.7Zr0.15Hf0.15)](Al0.69Sn0.18Si0.1(Mo/Ta/Nb)0.03)。对该系列合金进行950℃,1h固溶+560℃,6h时效处理,然后进行组织结构、硬度、抗高温氧化及电化学腐蚀性能测试。结果表明Zr0.15Hf0.15,合金与参比合金具有相同片层β转变组织,而在此基础上Ta和Nb的添加会使合金中产生大量等轴α组织;但组织的改变对系列合金的显微硬度影响不大,介于33003700MPa。650℃氧化100 h后系列合金均具有较强的抗氧化能力,氧化增重小于1.0mg/cm2,而在800℃氧化100h后,添加Hf、Ta、Nb元素的合金氧化增重明显低于Ti1100合金,氧化层厚度为2327μm,且氧化层致密,其中[Al-(Ti13.7Zr0.15Hf0.15)](Al0.69Sn0.18Si0.1Ta0.015Nb0.015)合金具有最优的抗高温氧化性能,800℃,100h后的氧化增重仅为2.6mg/cm2。此外,该系列合金在在3.5%NaCl溶液中也具有较好的耐蚀性。 The composition rule of near-a Ti alloy Ti1100 was investigated using a cluster-plus-glue-atom model for solid-solution alloys, and its cluster formula could be expressed as [Al-(Ti13.7Zr0.3)](Alo.69Sno.18Moo.03Sio.12) A new series of alloys by adding minor Hf, Ta andNb with similar elements substitution in equimolar ratio were then designed, being [Al-(Ti13.7Zr0.15Hf0.15)](A10.69Sn0.1sSi0.1(Mo/Ta/Nb)o.o3) These alloys were solid-solution-treated at 950 ℃ for 1 h followed by water-quenching, and then aged at 560 ℃ for 6 h. Subsequently, the microstructures, microhardness, elevated temperature oxidation- and corrosion-resistance of the alloys were measured. The results show that the alloy with Hf0.15 substitution for Zr0.15 in Till00 still exhibits a fl-transformed lamellar microstructure, while the further combinations of Ta and Nb induce a large amount of equiaxed a grains to form a duplex microstructure. The change of microstructure hardly affects the microhardness of the alloys, within a range of 3300-3700 MPa. All the designed alloys, as well as the reference Ti1100, possess excellent oxidation-resistance at 650 ℃, and all the oxidation mass gains are less than 1.0 mg/cm2. But the results are obviously different in comparison with that of Till00 at 800 ~C. The oxidation mass gains of the designed alloys with Hf, Ta and Nb co-alloying after 100 h are significantly fewer, and the widths of the dense oxidation layers are among 23-27 ktm. The [Al-(Ti13.TZr0.15Hf0.15)](A10.69Sn0.18Si0.1Ta0.015Nb0.015) alloy has the best oxidation resistance with the fewest oxidation mass gain of 2.6 mg/cm2. In addition, this series of alloys also have good corrosion resistance in 3.5%NaC1.
作者 车晋达 姜贝贝 王清 董闯 陈国清 张瑞谦 唐睿 徐芬 孙立贤 Che Jinda 1, Jiang Beibei 1, Wang Qing1, Dong Chuang1, Chen Guoqing1, Zhang Ruiqian 2 Tang Rui 2, Xu Fen 3, Sun Lixian 3 (1. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), Dalian University of Technology, Dalian 116024, China; 2. Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China; 3. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, China)
出处 《稀有金属材料与工程》 CSCD 北大核心 2018年第5期1471-1477,共7页 Rare Metal Materials and Engineering
基金 国家自然科学基金资助(51171035,51131002) 辽宁省自然科学基金(2015020202) 国家国际科技合作专项(2015DFR60370)广西信息材料重点实验室基金(161002-K)
关键词 近α-Ti合金 合金设计 微量元素 高温氧化 near-α Ti alloys composition design minor-addition of elements high-temperature oxidation
作者简介 车晋达,男,1991年生,硕士生,大连理工大学材料科学与工程学院,辽宁大连116024,电话:0411-84708615,E-mail:773574604@qq.com
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