Fatigue crack initiation and propagation of a TiNi shape memory alloy
Fatigue crack initiation and propagation of a TiNi shape memory alloy
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DOI：
10.1016/j.scriptamat.2010.02.001
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发表时间：
2010-05-01
影响因子：
6
通讯作者：
Riberty, P.
中科院分区：
文献类型：
--
作者：
Gloanec, A. -L.;Cerracchio, P.;Riberty, P.
本文用低周疲劳间断试验研究了TiNi形状记忆合金的疲劳裂纹萌生和扩展阶段。在疲劳循环载荷作用下，合金的响应呈现典型的伪弹性响应。两个潜在的启裂区域突出显示：在相界面和在晶界。裂纹的扩展是由许多微观裂纹合并而成的。这两个阶段在总疲劳寿命的最后20%中是可检测的。(C)2010 Acta Materialia Inc.由Elsevier Ltd.出版。保留所有权利。
In this paper, fatigue crack initiation and the propagation stages of a TiNi shape memory alloy are examined using a low cycle fatigue interrupted test. Submitted to fatigue cyclic loading, the response of the alloy presents a classical pseudoelastic response. Two potential initiation crack areas are highlighted: at the phase interfaces and at the grain boundaries. Propagation results from the coalescence of many microscopic cracks. These two stages are detectable in the last 20% of the total fatigue life. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.