等通道转角挤压对Mg-4Zn-1Mn-0.2Ca合金显微组织与腐蚀性能的影响  

Effect of equal channel angular pressing on microstructure and corrosion property of Mg-4Zn-1Mn-0.2Ca alloy

作　　者：虞佳雯 曹晓卿[1] 王利飞[1] 王永祥 李永峭 Yu Jiawen;Cao Xiaoqing;Wang Lifei;Wang Yongxiang;Li Yongqiao(College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《锻压技术》2023年第1期103-107,共5页Forging & Stamping Technology

基　　金：山西省自然科学基金资助项目(201901D111104);山西省国际合作项目(201903D421076)。

摘　　要：探讨了等通道转角挤压对生物医用合金材料Mg-4Zn-1Mn-0.2Ca合金显微组织和腐蚀性能的影响。通过对挤压态Mg-4Zn-1Mn-0.2Ca合金进行共8道次的等通道转角挤压变形,获得了不同状态的合金,并对3种不同状态的试样进行了显微组织观察。8道次变形后合金的晶粒尺寸最小为10.52μm,且组织更均匀。采用浸泡实验测得了合金在模拟体液中的腐蚀速率,其中8道次变形的合金的腐蚀速率最低,为1.897 mm·y^(-1),并通过电化学实验进一步分析了等通道扭转挤压变形后合金腐蚀行为的变化。结果表明:等通道转角挤压变形后挤压态Mg-4Zn-1Mn-0.2Ca镁合金的晶粒逐渐细化且组织更加均匀,随着挤压道次的增加,合金在模拟体液中的局部阻抗逐渐提高,耐蚀性得到了改善。The influences of equal channel angular pressing(ECAP) on the microstructure and corrosion property of biomedical Mg-4Zn-1Mn-0.2Ca alloy were investigated. Then, Mg-4Zn-1Mn-0.2Ca alloy was subjected to eight passes of equal channel angular pressing deformation to obtain the alloys in different states, and the microstructures of the samples in three states were observed. Furthermore, the minimum grain size of the alloy after eight-pass deformation was 10.52 μm, and the microstructure was more uniform. The corrosion rate of the alloy in the simulated body fluid(SBF) was measured by immersion experiment, and the corrosion rate of the alloy by eight-pass deformation was the lowest at 1.897 mm·y^(-1). Moreover, the change of the corrosion behavior for the alloy after the ECAP deformation was analyzed by electrochemical experiment. The results show that after ECAP deformation, the grains of extruded Mg-4Zn-1Mn-0.2Ca magnesium alloy are gradually refined and the microstructure is more uniform. With the increasing of extrusion pass, the local impedance of the alloy in SBF is gradually increased, and the corrosion resistance is improved.

关 键 词：Mg-4Zn-1Mn-0.2Ca合金 等通道转角挤压 组织均匀化 显微组织 耐蚀性 

分 类 号：TG379[金属学及工艺—金属压力加工]