复合添加Cr、Bi元素的ZA84镁合金时效硬化及微观组织研究（英文）
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摘要
利用扫描电镜及高分辨透射电镜对复合添加Cr、Bi元素的ZA84镁合金的时效硬化及微观组织进行了研究。结果表明:在ZA84合金中复合添加微量的Cr、Bi元素能显著增强合金时效硬化效果。ZA84-0.2Cr-0.5Bi合金经160℃时效,在时效初期基体存在严重的晶格畸变并含有数量较多的晶体缺陷。峰时效阶段合金微观组织中析出大量呈棒状或块状的MgZn_2相以及粒状的Bi_2Mg_3相,此时合计峰时效硬度HV达到924.8 MPa。随着时效时间的延长,沉淀相继续长大并粗化,其硬度也略有下降。
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 °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 β_1-MgZn_2 phases and granular Bi_2Mg_3 phases, and the peak hardness HV value is 924.8 MPa. When ageing proceed, the precipitates coarsening results in the hardness value reduction.
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 °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 β_1-MgZn_2 phases and granular Bi_2Mg_3 phases, and the peak hardness HV value is 924.8 MPa. When ageing proceed, the precipitates coarsening results in the hardness value reduction.
引文
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2 Ding Wenjiang.Science and Technology of Magnesium Alloy[M],Beijing:Science Press,2007(in Chinese)
3 Huang T H,Song P,Zhou H H et al.Rare Metal Materials and Engineering[J],2016,45(2):431(in Chinese)
4 Zhang D D,Hao X W,Fang D Q et al.Rare Metal Materials and Engineering[J],2016,45(9):2208
5 Shi G L,Zhang D F,Zhao X B et al.Rare Metal Materials and Engineering[J],2013,42(12):2447
6 Gao X,Nie J F.Scripta Mater[J],2007,56(8):645
7 Buha J.Mater Sci Eng A[J],2008,492(1-2):293
8 Buha J.Mater Sci Eng A[J],2008,491:70
9 Buha J.J Alloy Compd[J],2009,472:171
10 Mendis C L,Oh-ishi K,Ohkubo T et al.Mater Sci Eng A[J],2012,535:122
11 Zhang Guanghao,Chen Jihua,Yan Hongge et al.J Alloy Compd[J],2014,592:250
12 Bhattacharjee T,Mendis C L,Oh-ishi K et al.Mater Sci Eng A[J],2013,575:231
13 Oh-ishi K,Hono K,Shin K S.Mater Sci Eng A[J],2008,496:425
14 Lin Xiaoping,Dong Yun,Ye Jie et al.Mater Sci Eng A[J],2012,538:231
15 Sasaki T T,Ohkubo T,Hono K.Scripta Mater[J],2009,61:72
16 Yuan G Y,Sun Y S,Ding W J.Mater Sci Eng A[J],2001,308:38
17 Buha J.Mater Sci Eng A[J],2008,489:127