Transactions of Materials and Heat Treatment

Title：Study on superplastic forming of preformed blank for magnesium alloy wheel

Authors： Li Gengxin

Unit： Weihai Vocational College

KeyWords： magnesium alloy wheel superplastic forming

ClassificationCode：TG376

year,vol(issue):pagenumber：2014,39(6):71-74

Abstract：

The superplastic forming of preformed blank for casting AZ80A magnesium alloy wheel was studied, and the optimal parameters of superplatic forming for this alloy were selected based on the tests. The forming temperature is 410 ℃, and the strain rate is 0.01 s-1. Superplastic forming process was decided based on these parameters. The preformed blank of magnesium alloy wheel was made through isothermal extrusion technology. The microstructures of preformed blank wheel before and after forming were compared. The results show that the dynamic recrystallization happens during the preformed blank forming，the tiny isometric grains are obtained from big irregular casting ones through extrusion, the dendritic β phase is crushed，and along the axial direction the grains are in zonal distribution and fiber structure is formed. The synthesized mechanical properties of preformed blank of isothermal extruded wheel are excellent, especially the axial one is outstanding, which dues to the occuring of grain refinement and fiber structure caused by superplastic forming.

Funds：

河南省科技攻关项目（072102230007）；西北工业大学凝固技术国家重点实验室开放课题（SKLSP201008）

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