锻压技术

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

英文标题：Effect of equal channel angular pressing on microstructure and corrosion property of Mg-4Zn-1Mn-0. 2Ca alloy

作者：虞佳雯曹晓卿王利飞王永祥李永峭

单位：太原理工大学

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

出版年,卷(期):页码：2023,48(1):103-107

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. 52 μm, 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.

基金项目：

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

作者简介: 虞佳雯(1996-), 女, 硕士 E-mail: 752442518@ qq. com 通信作者: 曹晓卿(1966-), 女, 博士, 教授 E-mail: caoxiaoqing@ tyut. edu. cn

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