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材料工程  2015 

轧制AZ31镁合金板材(4mm)动态压缩性能与失效行为

DOI: 10.11868/j.issn.1001-4381.2015.02.010, PP. 61-66

Keywords: AZ31镁合金,SHPB,高应变速率,动态力学性能,失效行为

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Abstract:

为了研究轧制AZ31镁合金板材(4mm)在高应变速率下的动态力学性能和失效行为,采用分离式霍普金森压杆装置(SHPB)在室温下应变速率为500~2600s-1范围内对其进行了动态压缩实验,并利用金相显微镜(OM)和扫描电镜(SM)对冲击后的试样进行了显微分析.探讨了轧制AZ31镁合金板材沿轧制方向(RD)、横向(TD)和法向(ND)的动态压缩性能和失效行为.结果表明轧制AZ31镁合金4mm板材动态压缩性能存在各向异性.沿RD和TD方向压缩的动态性能相同,沿ND方向压缩的动态断裂强度最大.AZ31镁合金4mm板材的动态压缩断裂机制为解理断裂.变形机制为沿RD和TD方向高速压缩时,{1012}〈1120〉拉伸孪晶参与变形;沿ND方向高速压缩时,{1011}〈1120〉压缩孪晶参与变形.

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