Transactions of Materials and Heat Treatment

Title：Study on compound forming and heat treatment behavior of magnesium alloy AZ91 for automobile

Authors： Xie Jian Liu Yiguan Hu Jun Wen Aimin

Unit： Nanjing Communications Institute of Technology

KeyWords： magnesium alloy AZ91 squeeze casting isothermal forging artificial aging

ClassificationCode：

year,vol(issue):pagenumber：2016,41(7):123-128

Abstract：

Evolution of microstructure and properties of magnesium alloy AZ91 under different technological conditions for automobile were studied by extrusion casting, isothermal die forging and artificial aging treatment, and the mechanism was discussed. The results show that the squeeze cast magnesium alloy AZ91 is mainly composed of primary α-Mg matrix, divorced eutectic phase (Mg17Al12 phase) and β precipitated phase. After isothermal die forging, the hard deformation zone, large deformation zone and small deformation zone exist in the alloy, and the recrystallization volume fraction in the hard deformation zone and the small deformation zone increases significantly with the increase of deformation. Thus, the large deformation zone is composed of fine dynamic recrystallization grains. Furthermore, the mechanical properties of the alloy with different deformations are improved compared to the cast alloy, and the tensile strength, yield strength, elongation and hardness show a rising trend with the increase of deformation. Finally, the comprehensive performance of magnesium alloy AZ91 after isothermal forging and heat treatment is higher than that of squeeze cast alloy.

Funds：

南京交通职业技术学院科研创新计划（2014002）

谢剑（1972-），男，硕士，副教授

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