Low cycle fatigue behaviour of a precipitation hardened Cu-Ni-Si alloy
Low cycle fatigue behaviour of a precipitation hardened Cu-Ni-Si alloy
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DOI：
10.1016/j.ijfatigue.2016.07.019
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发表时间：
2016-11-01
影响因子：
6
通讯作者：
Primaux, Francois
中科院分区：
文献类型：
--
作者：
Delbove, Maxime;Vogt, Jean-Bernard;Primaux, Francois
在室温下进行低周疲劳试验，以研究Cu-Ni-Si合金的微观结构对应变循环的应力响应和抗疲劳性的作用。循环调节由硬化和软化组成。TEM分析表明，在一些晶粒中，位错保持孤立和限制在沉淀物之间，而在其他晶粒中，位错堆积在δ-Ni 2Si沉淀物中，然后切割它们。重复切割允许它们溶解并在塑性变形局部化的地方形成无沉淀带。Manson-Coffin图根据参与塑性变形调节的晶粒比例表现出两个区域。(C)2016爱思唯尔有限公司版权所有。
Low cycle fatigue tests were performed at room temperature to investigate the role of the microstructure of a Cu-Ni-Si alloy on the stress response to strain cycling and on the fatigue resistance. The cyclic accommodation consisted of a hardening followed by a softening. TEM analysis showed that in some grains dislocations remained isolated and confined between precipitates while in other grains dislocations piled up at delta-Ni2Si precipitates and then cut them. Repetitive cutting allows their dissolution and formation of precipitate-free bands where the plastic deformation is localised. The Manson-Coffin diagram exhibited two regimes according to the proportion of grains involved in the plastic deformation accommodation. (C) 2016 Elsevier Ltd. All rights reserved.