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挤压铸造压力对半固态Mg98.5Ni0.5Y1.0合金组织及力学性能的影响 预览

Effect of Squeeze Pressure on Microstructure and Mechanical Properties of Semisolid Mg98.5Ni0.5Y1.0 Alloy
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摘要 采用超声振动制备Mg98.5Ni0.5Y1.0合金半固态浆料,随后将浆料直接挤压铸造成形,研究了挤压压力对合金组织和性能的影响。结果表明,挤压铸造能显著细化半固态Mg98.5Ni0.5Y1.0合金中的初生α-Mg相和长周期堆垛有序(LPSO)结构。挤压铸造压力能提高Y和Ni元素在镁基体中的固溶度,促使Mg2Ni颗粒在LPSO结构中析出。随着挤压铸造压力的升高,合金的晶粒尺寸降低,强度不断提高,100MPa时合金具有最佳的综合性能,其抗拉强度、屈服强度以及伸长率分别为240MPa、113MPa和13.12%,与未施加压力的合金相比,分别提高了7.6%、19.56%和12.7%。 Semisolid slurry of Mg98.5Ni0.5Y1.0 alloy prepared by ultrasonic vibration was squeeze cast under different pressures to study the effect of squeeze pressure on the microstructure and mechanical properties of the alloy. The results show that squeezing casting can refine significantly the primary α-Mg phase and LPSO structure in semi-solid Mg98.5Ni0.5Y1.0 alloy. Pressure can improve the solid solubility of Y and Ni elements in magnesium matrix and promote the precipitation of granular Mg2Ni phase in LPSO structure. The grain size decreases with the increase of squeeze pressure, leading to an improvement in strength. The alloy solidified under applied pressure of 100 MPa has the best combination of properties. Its tensile strength, yield strength and elongation are 240 MPa, 113 MPa and 13.12%, respectively. Compared with the alloy without squeeze pressure, they are increased by 7.6%, 19.56% and 12.7%, respectively.
作者 余亮 吴树森 杨雄 汪学阳 吕书林 YU Liang;WU Shu-sen;YANG Xiong;WANG Xue-yang;Lü Shu-lin(Guangdong Hongtu Technology (holdings) Co.,Ltd.,Zhaoqing 526108,Guangdong,China;State Key Laboratory of Materials Processing and Die & Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China)
出处 《铸造》 CAS 北大核心 2019年第6期607-612,共6页 Foundry
基金 国家自然科学基金项目(51505165)。
关键词 镁合金 LPSO结构 挤压压力 半固态 组织 Mg alloy LPSO structure squeeze pressure semisolid microstructure
作者简介 余亮(1971-),男,大专,产品开发总监,主要研究方向为合金材料及压力铸造。Email:yuliang@ght-china.com;通讯作者:吕书林,男,副教授,博士,硕士生导师。电话:027-87556262,Email:shulin317@hust.edu.cn.
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