挤压温度对Mg-2.0Zn-0.5Zr-3.0Gd生物降解镁合金组织、力学性能及耐腐蚀性能的影响  

Effect of extrusion temperature on microstructure, mechanical properties and corrosion resistance of biodegradable Mg-2.0Zn-0.5Zr-3.0Gd magnesium alloy

作　　者：姚怀[1,2] 文九巴 熊毅[1,2] 贺俊光 刘亚[1] YAO Huai;WEN Jiu-ba;XIONG Yi;HE Jun-guang;LIU Ya(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Collaborative Innovation Center of Nonferrous Metals,Luoyang 471023,China)

机构地区：[1]河南科技大学材料科学与工程学院,洛阳471023 [2]有色金属共性技术河南省协同创新中心,洛阳471023

出　　处：《中国有色金属学报》2018年第12期2422-2432,共11页The Chinese Journal of Nonferrous Metals

基　　金：河南省高校科技创新团队支持计划资助项目(2012IRTSTHN008);河南省高校科技创新人才支持计划项目(17HASTIT026);河南省科技攻关计划项目(152102210077);河南省教育厅科技计划项目(16A430005);河南科技大学科技创新团队资助项目(2015XTD006)~~

摘　　要：研究挤压温度对铸态Mg-2.0Zn-0.5Zr-3.0Gd生物镁合金组织、力学性能及耐腐蚀性能的影响。结果表明:挤压温度在330～350℃时,动态再结晶的体积分数随挤压温度的升高而增加;在350～370℃时,动态再结晶的体积分数随温度的升高而降低。挤压态合金的析出相主要由纳米级的棒状(Mg, Zn)_3Gd相和新析出的颗粒状Mg_2Zn_(11)相组成。合金的力学性能与动态再结晶晶粒的体积分数成正比关系。挤压温度为350℃时,合金的抗拉强度、屈服强度及伸长率分别为(247±3) MPa、(214±3) MPa和(26.7±1.1)%。随着挤压温度的升高,合金的腐蚀速率先减小后增大,挤压温度为350℃时,合金的静态腐蚀速率及析氢腐蚀速率分别为0.614 mm/a和0.598 mm/a。Effects of the extrusion temperature on the microstructure,mechanical properties and corrosion resistance of as-cast Mg-2.0Zn-0.5Zr-3.0Gd biomedical magnesium alloy were investigated.The experimental results show that the volume fraction of dynamic recrystallized(DRXed)microstructure increases with increasing the extrusion temperature from 330℃to 350℃,but decreases as the temperature increased further to 370℃.The precipitated phases of extruded alloys are composed of nanoscale rod-like(Mg,Zn)3Gd and granular Mg2Zn11 phase.The Mg2Zn11 precipitated phase is a new precipitated phase in the extrusion process.The mechanical properties of extruded alloys are proportional to the volume area fraction of the DRXed grains.When the extrusion temperature is 350℃,the ultimate tensile strength,yield strength and ultimate tensile strength of extruded alloys are(248±3)MPa,(228±3)MPa and(29.4±0.9)%,respectively.The corrosion rates of the extruded alloys decrease initially and then increase with increasing the extrusion temperature from 330℃to 370℃.The corrosion rates of the alloy were determined to be 0.614 mm/a and 598 mm/a,respectively,in mass loss and hydrogen evolution methods when the extrusion temperature is 350℃.

关 键 词：镁合金 微观组织 生物腐蚀性能 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]