冲击加载条件下AZ31B镁合金变形孪晶的微观特征

兵工学报 ›› 2009, Vol. 30 ›› Issue (9): 1223-1226.

冲击加载条件下AZ31B镁合金变形孪晶的微观特征

杨勇彪^1,2，王富耻²，谭成文²，才鸿年²

1．中北大学信息与通信工程学院，山西太原030051;2．北京理工大学材料学院，北京100081

收稿日期:2008-03-30 上线日期:2014-12-25
通讯作者: 杨勇彪 E-mail:yangyongbiao@ yahoo. com. cn:
作者简介:杨勇彪（19 71-），男，博士研究生。

Microstructure Characterization of Twinning Under Impact Loading for AZ31B Magnesium Alloys

YANG Yong-biao^1,2, WANG Fu-chi², TAN Cheng-wen²,CAI Hong-nian²

1. School of information and communication Engineering, North University of China, Taiyuan 030051, Shanxi, China; 2. School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China

Received:2008-03-30 Online:2014-12-25
Contact: YANG Yong-biao E-mail:yangyongbiao@ yahoo. com. cn:

摘要/Abstract

摘要： 采用分离式Hopkinson压杆(SHPB)对A231B热轧板材沿轧向进行冲击实验，加载应变率约为1200 s-1．利用金相显微镜和透射电子显微镜观察微观组织特征。结果表明：在应变量约为0.003的条件下，压缩孪生{10?1}/<10?2>与拉伸孪生{1?02}/< 1?01>均为孪生塑性变形机制，这与准静态加载下单一的拉伸孪生机制不同。孪晶内部的微观特征演化过程包括：1）平行排列基面层错的出现；2）与孪晶界成特定角度平行排列位错线的形成；3）位错胞的产生。

关键词: 金属材料 , 庄缩孪生 , 拉伸孪生 , 位错胞 , 基面层错

Abstract: Dynamic mechanical properties of AZ31B sheet were carried out in compression along rolling direction using split Hopkinson bar (SHPB) at the strain rate of 1200 s-1 ? Post-mortem observations were conducted using optical microscope and transmission electron microscope. The results show that both {10?1}/く10?2 > and {1?02}/< 10?1> twinning are the plastic deformation mechanisms at the strain of 0.003，which is different from the {10?2}/< 10?1 > twinning deformation mechanism under quasi-static loading condition. The evolution of microstructure inside twinning consists of parallel basal stacking faults, parallel dislocation arrays of different orientations to twin boundary and disloca?tion cells.

Key words: metallic material , tensile twinning , contraction twinning , dislocation cells , basal stacking faults

中图分类号:

TG146.2+．2

杨勇彪，王富耻，谭成文，才鸿年. 冲击加载条件下AZ31B镁合金变形孪晶的微观特征[J]. 兵工学报, 2009, 30(9): 1223-1226.

YANG Yong-biao, WANG Fu-chi, TAN Cheng-wen,CAI Hong-nian. Microstructure Characterization of Twinning Under Impact Loading for AZ31B Magnesium Alloys[J]. Acta Armamentarii, 2009, 30(9): 1223-1226.

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