锻压技术

等温锻造温度对机械外壳用Mg-8Al-1Zn-0.5Ca镁合金组织与性能的影响

英文标题：Influence of isothermal forging temperature on microstructure and properties of Mg-8Al-1Zn-0.5Ca magnesium alloy for mechanical shells

作者：郭伟1 李桐2

单位：1.河南工业和信息化职业学院机械工程系 2.郑州大学机械与动力工程学院

关键词：等温锻造温度 Mg-8Al-1Zn-0.5Ca镁合金显微组织耐磨损性能耐腐蚀性能

分类号：TH164

出版年,卷(期):页码：2024,49(10):15-20

摘要：

为了研究等温锻造温度对机械外壳用Mg-8Al-1Zn-0.5Ca镁合金组织与性能的影响，选择5种等温锻造温度对合金试样进行锻造试验，并进行了显微组织分析、耐腐蚀和耐磨损性能的测试与分析。结果发现：随着等温锻造温度从340 ℃增加至420 ℃，Mg-8Al-1Zn-0.5Ca镁合金的平均晶粒尺寸先减小后增大、腐蚀电位先正移后负移、磨损体积先减小后增大，合金的耐腐蚀和耐磨损性能先变好后变差。相较于等温锻造温度为340 ℃，等温锻造温度为400 ℃时的Mg-8Al-1Zn-0.5Ca镁合金的平均晶粒尺寸减小了76.1%、腐蚀电位正移141 mV、磨损体积减小了66.2%。研究结果表明，Mg-8Al-1Zn-0.5Ca镁合金的等温锻造温度优选为400 ℃。

In order to investigate the influence of isothermal forging temperature on the microstructure and properties of Mg-8Al-1Zn-0.5Ca magnesium alloy for mechanical shells, five kinds of isothermal forging temperatures were selected for forging tests on the alloy samples, and the microstructure analysis, and the test and analysis of corrosion resistance and wear resistance properties were conducted. The results show that as the isothermal forging temperature increases from 340 ℃ to 420 ℃, the average grain size of Mg-8Al-1Zn-0.5Ca magnesium alloy first decreases and then increases, the corrosion potential shifts positively first and then negatively, the wear volume first decreases and then increases, and both the corrosion resistance and wear resistance properties first improve and then deteriorate. Compared with the isothermal forging temperature of 340 ℃, the average grain size of Mg-8Al-1Zn-0.5Ca magnesium alloy decreases by 76.1%, the corrosion potential shifts positively by 141 mV, and the wear volume decreases by 66.2% at the isothermal forging temperature of 400 ℃. The research results show that the optimal isothermal forging temperature for Mg-8Al-1Zn-0.5Ca magnesium alloy is 400 ℃.

基金项目：

河南省重点研发与推广专项项目（202102310204）

作者简介：郭伟（1982-），男，硕士，副教授,E-mail：61140911@qq.com

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