锻压技术

镁合金汽车轮毂的挤压变形与性能研究

英文标题：Study on extrusion deformation and properties for magnesium alloy automotive hubs

作者：宋飞吴会波罗志林

分类号：TG146.2

出版年,卷(期):页码：2019,44(12):174-181

摘要：

研究了挤压温度对汽车轮毂用AM50-1.8%Ca镁合金显微组织、力学性能和耐腐蚀性能的影响。结果表明：挤压温度为325~425 ℃时AM50-1.8%Ca镁合金的组织都为等轴晶+黑色颗粒状第2相，AM50-1.8%Ca镁合金在挤压温度为375 ℃ 时具有最为细小且均匀的组织；在相同浸泡时间下，挤压温度为375 ℃的AM50-1.8%Ca镁合金的析氢体积最小、腐蚀速率最小、腐蚀电位最大、腐蚀电流密度最小，且挤压温度为325和425 ℃的试样在腐蚀过程中都有点蚀发生，而挤压温度为375 ℃ 的试样在腐蚀过程中无点蚀发生；挤压温度为375 ℃时，AM50-1.8%Ca镁合金具有最佳的耐腐蚀性能和较高的强塑性，这主要与此时合金的晶粒细化、细小第2相的均匀分布以及组织均匀性等有关。

The influences of extrusion temperature on the microstructure, mechanical properties and corrosion resistance property of AM50-1.8%Ca magnesium alloy for automobile hub were studied. The results show that the microstructure of AM50-1.8%Ca magnesium alloys is the equiaxed grains + the black granular second phase at the extrusion temperature of 325-425 ℃, and AM50-1.8%Ca magnesium alloy has the smallest and uniform microstructure at the extrusion temperature of 375 ℃. Under the same immersion time, AM50-1.8%Ca magnesium alloy at the extrusion temperature of 375 ℃ has the smallest hydrogen evolution volume, the smallest corrosion rate, the maximum corrosion potential and the smallest corrosion current density, and the specimens at the extrusion temperature of 325 ℃ and 425 ℃ has pitting corrosion during the corrosion process, and the specimens at the extrusion temperature of 375 ℃ has not pitting corrosion during the corrosion process. Furthermore, AM50-1.8%Ca magnesium alloy has the best corrosion resistance property and high plasticity at the extrusion temperature of 375 ℃, which is mainly related to the grain refinement, the uniform distribution of the fine second phase and the homogeneity of microstructure for the alloy.

基金项目：

科技创新团队基金(KJ17006)；南京信息职业技术学院横向课题（HX20191002)

宋飞（1980-），男，硕士，讲师 E-mail：465858213@qq.com

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