Roles of deformation twinning and dislocation slip in the fatigue failure mechanism of AZ31 Mg alloys
Roles of deformation twinning and dislocation slip in the fatigue failure mechanism of AZ31 Mg alloys
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DOI：
10.1016/j.scriptamat.2010.03.021
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发表时间：
2010-10-01
影响因子：
6
通讯作者：
Sutou, Y.
中科院分区：
文献类型：
--
作者：
Koike, J.;Fujiyama, N.;Sutou, Y.
对AZ 31镁合金进行了室温拉伸循环疲劳试验。在低于和高于疲劳极限时均观察到{1 0（1）over bar 2}类型的变形孪晶，表明{1 0（1）over bar 2}孪晶不会直接导致疲劳失效。然而，棱柱滑动和大量的循环硬化观察到以上的疲劳极限。渐进硬化引起{1 0 1 1}-{1 0（1）在棒2上}双孪晶，这导致形成大的表面台阶、裂纹和最终失效。(C)2010 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Fatigue tests were performed on AZ31 Mg alloys at room temperature in tension cycles. Deformation twinning of the {1 0 (1) over bar 2} type was observed both below and above the fatigue limit, indicating that the {1 0 (1) over bar 2} twins do not contribute directly to fatigue failure. However, prismatic slip and substantial cyclic hardening were observed above the fatigue limit. Progressive hardening gave rise to {1 0 1 1}-{1 0 (1) over bar 2} double twinning that led to the formation of large surface steps, cracks and eventual failure. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.