Transactions of Materials and Heat Treatment

Title：Study on extrusion deformation and properties for magnesium alloy automotive hubs

Authors： Song Fei Wu Huibo Luo Zhilin

Unit： Nanjing Vocational College of Information Technology Nanjing University of Aeronautics and Astronautics

KeyWords： magnesium alloy automotive hub microstructure extrusion deformation corrosion resistance property

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2019,44(12):174-181

Abstract：

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.

Funds：

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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