Fatigue behaviour of age-hardened Cu-Ni-Si alloy and effect of sporadic discontinuous precipitates on fatigue strength

被引：3

作者：

Goto, M. ^{[1
]}

Han, S. Z. ^{[2
]}

Yamamoto, T. ^{[1
]}

Kitamura, J. ^{[1
]}

Ahn, J. H. ^{[2
]}

Iwamura, T. ^{[1
]}

Lim, S. H. ^{[3
]}

机构：

[1] Oita Univ, Dept Mech Engn, Oita 8701192, Japan

[2] Korea Inst Mat Sci, Chang Won 624831, South Korea

[3] Kangwon Natl Univ, Chunchon 200701, South Korea

来源：

3RD INTERNATIONAL SYMPOSIUM ON FATIGUE DESIGN AND MATERIAL DEFECTS (FDMD 2017) | 2017年 / 7卷

基金：

日本学术振兴会; 新加坡国家研究基金会;

关键词：

Fatigue; Copper alloy; Crack initiation; Micrstuructur; CONDUCTIVITY;

D O I：

10.1016/j.prostr.2017.11.085

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Microstructure and fatigue strength of Cu-Ni-Si alloy with high solute concentrations were studied. The maximum hardness of this alloy was obtained by 0.5 h aging (500 degrees C) and the matrix was strengthened by nano-size 6-Ni2Si precipitates. In addition, some parts of grains transformed into discontinuous precipitates which bring a detrimental effect on mechanical properties, producing a sporadic distribution of discontinuous precipitates. The fatal cracks, which led to the fracture of the specimen, were initiated at the grain boundaries, not at discontinuous precipitation phases. The physical background of fatigue damage is discussed in light of the role of microstructure on the behaviour of fatigue cracks. Copyright ED 2017 The Authors. Published by Elsevier B.V.

引用

页码：248 / 253

页数：6

共 12 条

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