Influence of grain size on strain rate sensitivity in rolled Mg–3Al–3Sn alloy at room temperature
Influence of grain size on strain rate sensitivity in rolled Mg–3Al–3Sn alloy at room temperature
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DOI：
10.1016/j.scriptamat.2012.10.019
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发表时间：
2013-03
影响因子：
6
通讯作者：
Huiyuan Wang;En-Song Xue;X. Nan;Tao Yue;Yan-Peng Wang;Q. Jiang
中科院分区：
文献类型：
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作者：
Huiyuan Wang;En-Song Xue;X. Nan;Tao Yue;Yan-Peng Wang;Q. Jiang
在室温下，轧制Mg-3Al-3Sn（AT 33）合金的应变速率敏感性随晶粒尺寸的减小而增大，这是由于变形机制由位错主导转变为孪晶介导所致。此外，随着变形的进行，滑移主导晶粒（φ 6μm）的SRS由于α_c+ α_c滑移的持续激活而逐渐减小，而孪晶介导晶粒（φ 41μm）的SRS由于α_c+ α_c滑移、收缩孪晶（{101孪晶）的共同作用而迅速减小。
The strain rate sensitivity (SRS) of a rolled Mg–3Al–3Sn (AT33) alloy increased with decreasing grain size at room temperature, owing to a change in the deformation mechanism from dislocation-dominated to twinning-mediated. Moreover, as deformation proceeds the SRS for slip-dominated grains (∼6μm) decreases gradually due to continuous activation of 〈c+a〉 slip, while that for twinning-mediated grains (∼41μm) decreases rapidly because of the combined action of 〈c+a〉 slip, contraction twinning ({101¯1}〈101¯2〉) and extension twinning ({101¯2}〈101¯1¯〉).