Age Hardening and Microstructure of ZA84 Magnesium Alloy with the Combined Addition of Cr and Bi

作者：Ye Jie; Lin Xiaoping^*; Dong Yun; Teng Fei; Sun Guifang; Han Jie

来源：Rare Metal Materials and Engineering, 2018, 47(1): 39-42.

DOI：10.1016/s1875-5372(18)30068-7

• crystal defect
• age hardening
• strengthening phase
• ZA84-0.2Cr-0.5Bi alloy

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 that 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 was aged at 160 degrees C, 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 beta(1)'-MgZn2 phases and granular Bi2Mg3 phases, and the peak hardness HV value is 924.8 MPa. When ageing proceed, the precipitates coarsening results in the hardness value reduction.

• 出版日期2018-1
• 单位东北大学