Age hardening and microstructure of ZA84 magnesium alloy with the combined addition of Cr and Bi

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Age hardening and microstructure of ZA84 magnesium alloy with the combined addition of Cr and Bi
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Affiliation:School of Materials Science and Engineering,Northeastern University,School of Materials Science and Engineering,Northeastern University,School of Materials Science and Engineering,Northeastern University,School of Materials Science and Engineering,Northeastern University,School of Materials Science and Engineering,Northeastern University,School of Materials Science and Engineering,Northeastern University
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Fund Project:The National Natural Science Foundation of China（51675092）; Hebei Province Natural Science Fund（E2014501123）

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Abstract:

The age hardening and microstructure of ZA84 magnesium alloy with the combined addition of Cr and Bi was studied by SEM and HRTEM. The results show a trace amount of Cr and Bi has a significant enhancement effect on the hardness of aging. When the ZA84-0.2Cr-0.5Bi alloy aged at 160℃, during the early aging period, the matrix has serious lattice distortion and a large number of crystal defects. The microstructure at the peak aging consists of a large number of rod-like or blocky β1’-MgZn2 phases and granular Bi2Mg3 phases, and the peak hardness value is 92.48HV. When ageing proceeded, the precipitate coarsening resulted in the hardness value reduction.

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[Jie Ye, Xiao-ping Lin, Yun Dong, Fei Teng, Gui-fang Sun, jie Han. Age hardening and microstructure of ZA84 magnesium alloy with the combined addition of Cr and Bi[J]. Rare Metal Materials and Engineering,2018,47(1):39~42.]
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Received:July 22,2016
Revised:March 17,2017
Adopted:April 14,2017
Online: February 07,2018
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