On the diversity of the plastic response of magnesium in plane strain compression
On the diversity of the plastic response of magnesium in plane strain compression
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镁平面应变压缩塑性响应的多样性
DOI：
10.1016/j.msea.2015.10.108
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发表时间：
2016
期刊：
影响因子：
6.4
通讯作者：
Molodov
中科院分区：
文献类型：
--
作者：
Molodov;Al-Samman;Molodov
选定的“硬”和“软”取向的镁单晶在室温下变形的通道模具压缩。具有“硬”基底起始取向的试样显示出有限的延展性并沿着{11 2 <$4}面断裂。垂直于{10 1 2}延伸孪生取向c轴的压缩揭示了非常对比的变形行为。沿着晶体学< 11 2 <$0>方向压缩的试样表现出异常高的室温延展性，而沿着< 10 1 <$0>方向压缩导致在初始S形应力-应变响应后失效。在这两种情况下，{10 1 <$2}延伸孪晶被发现在低应变下完全消耗基质，并将起始取向转换为对应于相应的高施密德因子孪晶变体的取向。对于c轴受到约束的棱柱形起始取向，也获得了高应变。在标本中，有利地定向为基底滑移，异常{10 1 <$2}延伸孪晶形成，聚集在平行于约束方向的带。这些孪晶产生了与所施加的平面应变变形相反的应变，并提供了显著的动态晶界强化效果。
Mg single crystals of selected ‘hard’and ‘soft’orientations were deformed at ambient temperature in channel-die compression. Specimens with a ‘hard’basal starting orientation displayed a limited ductility and fractured along {11 2 ̅ 4} planes. Compression perpendicular to the c-axis of orientations well aligned for {10 1 ̅ 2} extension twinning revealed a very contrasting deformation behavior. Specimens compressed along the crystallographic< 11 2 ̅ 0> direction exhibited an exceptionally high room temperature ductility, whereas compression along< 10 1 ̅ 0> resulted in failure after an initial sigmoidal stress–strain response. In both cases {10 1 ̅ 2} extension twins were found to fully consume the matrix at low strains and convert the starting orientations into orientations corresponding to the respective high Schmid factor twin variants. High strains have also been attained for a prismatic starting orientation where the c-axis was constrained. In specimens, favorably oriented for basal slip, anomalous {10 1 ̅ 2} extension twins formed, clustered in bands parallel to the constraint direction. These twins produced a strain opposite to the imposed plane strain deformation and provided a pronounced dynamic grain boundary strengthening effect.
常温下镁单晶的形变诱导再结晶
DOI：
10.1088/1757-899x/82/1/012014
发表时间：
2015
期刊：
IOP Conference Series: Materials Science and Engineering
影响因子：
--
作者：
K. Molodov;T. Al;D. Molodov
通讯作者：
D. Molodov
影响因子：
9.4
作者：
Molodov, Konstantin D.;Al-Samman, Talal;Gottstein, Guenter
通讯作者：
Gottstein, Guenter