Relationship between deformation twinning and surface step formation in AZ31 magnesium alloys
Relationship between deformation twinning and surface step formation in AZ31 magnesium alloys
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DOI：
10.1016/j.actamat.2010.03.044
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发表时间：
2010-08-01
期刊：
影响因子：
9.4
通讯作者：
Sutou, Y.
中科院分区：
文献类型：
--
作者：
Ando, D.;Koike, J.;Sutou, Y.
AZ31镁合金轧制板在室温下在沿轧制方向的张力作用下发生变形。在断裂边缘附近的区域观察到许多大的表面台阶。透射电子显微镜显示在这些步骤下存在双胞胎。晶体分析表明，孪晶属于{1 0 (1) over bar 1}-{1 0 (1) over bar 2}双孪晶类型，其基面相对于基体基面倾斜37°，这被认为使得孪晶内部的基面位错滑移高度活跃。孪晶内的局部变形可能导致裂纹状断层的形成并导致宏观脆性破坏。 (C) 2010 Acta Materialia Inc. 由 Elsevier Ltd 出版。保留所有权利。
Rolled sheets of AZ31 Mg alloys were deformed at room temperature under tension along the rolling direction. A number of large surface steps were observed in the region near the fractured edge. Transmission electron microscopy showed the presence of twins under these steps. Crystallographic analysis indicated that the twins are of the {1 0 (1) over bar 1}-{1 0 (1) over bar 2} double twin type with their basal planes tilted by 37 degrees with respect to the basal planes of the matrix, which is considered to make basal dislocation slip highly active within the twin. The localized deformation within the twins may lead to the formation of crack-like faults and to failure in a macroscopically brittle manner. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.