Low cycle fatigue behavior of Cu-Cr-Zr alloy

doi:10.13251/j.issn.0254-6051.2020.04.021

Abstract

Abstract: The low-cycle fatigue properties and cyclic deformation behavior of Cu-Cr-Zr alloys were studied by means of low cycle fatigue (LCF) tests at room temperature. The microstructure and fatigue fracture of the alloy were analyzed by electron backscattered diffraction (EBSD), transmission electron microscopy (TEM), and scanning electron microscopy(SEM). The results show that the relationship between the elastic strain amplitude, the plastic strain amplitude and the number of cycles can be expressed by Basquin and Coffin-Manson formulas, respectively. The cyclic hardening occurs at the later stage of fatigue deformation with a high applied total strain amplitude (Δε_t/2=0.6%), the cyclic deformation microstructure is a mixed structure of dislocation walls, dislocation clusters, and cellular substructure, and the formation of twins is observed. In addition, the fatigue fracture characteristics of the selected material at an applied total strain amplitude of 0.4% exhibit multiple fatigue sources, a large number of tearing edges, dimples, and furrows are observed in the fatigue crack propagation area.

Key words: Cu-Cr-Zr alloy, low cycle fatigue behavior, fatigue fracture, dislocation morphology

CLC Number:

TG146.1

Jie Xiao, Zhong Qiangqiang, Wang Junfeng, Chen Jinshui, Xiao Xiangpeng. Low cycle fatigue behavior of Cu-Cr-Zr alloy[J]. Heat Treatment of Metals, 2020, 45(4): 105-109.

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