生物可降解挤压态Mg-Sn-Zn-Zr合金组织与腐蚀性能的研究  

Study on Microstructure and Corrosion Properties of Biodegradable Extruded Mg-Sn-Zn-Zr Alloys

作　　者：刘德学[1,2] 张全发 郭菲菲 周田水 LIU Dexue;ZHANG Quanfa;GUO Feifei;ZHOU Tianshui(College of Materials Science and Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou Univ.of Tech.,Lanzhou 730050,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《热加工工艺》2024年第15期94-99,共6页Hot Working Technology

基　　金：国家自然科学基金资助项目(1216023,51365029,5206126);甘肃省重点研发计划-国际合作项目(20YF8WA064)。

摘　　要：采用气体保护法制备了高强塑性Mg-Sn-Zn-Zr(TZK)合金,然后在不同温度(300、350、400℃)对其进行挤压变形,并对合金的微观组织、物相组成和体外降解行为进行研究。结果表明:300℃挤压后合金的组织为均匀细小的等轴晶,晶粒尺寸最小,为6.57μm;析氢量和腐蚀速率最低,耐腐蚀性能最好。随挤压温度升高,合金的晶粒长大,组织中出现孪晶,导致其耐腐蚀性能变差。High-strength and plasticity Mg-Sn-Zn-Zr(TZK)alloy was prepared by gas shielding method,and then the alloy was subjected to extrusion deformation at different temperatures(300℃,350℃and 400℃),and the microstructure,phase composition and in-vitro degradation behavior of the alloy were studied.The results show that the microstructure of the alloy after extrusion at 300℃is uniform and fine equiaxed grains,and the grain size is the smallest,which is 6.57μm;the hydrogen evolution and corrosion rate are lowest,and the corrosion resistance is best.With the increase of extrusion temperature,the grains of the alloy grow up and twin crystals appear in the structure,resulting in poor corrosion resistance.

关 键 词：Mg-Sn-Zn-Zr合金 挤压变形 微观组织 腐蚀性能 

分 类 号：TG379[金属学及工艺—金属压力加工] TG146.22[一般工业技术—材料科学与工程]