Transactions of Materials and Heat Treatment

Title：Superplastic deformation analysis on Mg-Zn-Zr alloy for vehicle shock-absorbing material with different FSP rotation speeds

Authors： Shang Xia Ma Lihua

Unit： Yellow River Traffic College

KeyWords： friction stir machining Mg-Zn-Zr alloy superplasticity grain boundary microstructure

ClassificationCode：TG456.9

year,vol(issue):pagenumber：2019,44(6):162-167

Abstract：

The Mg-Zn-Zr alloy used for vehicle shock-absorbing material was processed by friction stir processing (FSP) at 500-1500 r·min-1 rotation speed, and the grain size, micro-morphology and the second phase structure of alloy during the superplastic deformation process were analyzed. The results show that the second phase microstructure is formed in the base metal as the dispersion distribution after FSP, and with the increasing of FSP rotation speed, the second phase particle refinement of magnesium alloy is significantly improved to form the uniform dispersion distribution. Then, the dispersion phase β existing in the alloy effectively guarantees the good superplasticity of alloy under strain rate, and FSP causes the obvious dynamic recrystallization of alloy. When the rotation speed of FSP increases, a larger grain boundary dislocation angle occurs in the alloy, and the difference between the results of grain boundary distribution and the random grain boundary distribution decreases. Furthermore, the elongation of alloy at all FSP rotation speeds is over 200% to show the good superplasticity. When the rotation speed of FSP increases, the optimum strain rate and the elongation of alloy increase significantly, and the deformation temperature also increases. After superplastic deformation, the grain boundary slip occurs in all alloys, and when the FSP rotation speed is increased, the grains are obviously refined.

Funds：

河南省科技攻关计划项目(154102310028)

尚霞(1979-), 女，学士，讲师 E-mail：gaomingda346588@126.com

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