Role of microstructure on initiation and propagation of fatigue cracks in precipitate strengthened Cu-Ni-Si alloy

被引：37

作者：

Goto, M. ^{[1
]}

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

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

Kitamura, J. ^{[1
]}

Fujimura, T. ^{[1
]}

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

Yamamoto, T. ^{[1
]}

Kim, S. ^{[4
]}

Lee, J. ^{[5
]}

机构：

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

[2] Korea Inst Mat Sci, Struct Mat Div, Chang Won 642831, South Korea

[3] Kangwon Natl Univ, Dept Adv Mat Sci & Engn, Chunchon 200701, South Korea

[4] Gyeongsang Natl Univ, Dept Mat Sci & Engn, RECAPT, Chinju, South Korea

[5] Changwon Natl Univ, Dept Met & Mat Engn, Chang Won 641773, South Korea

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2016年 / 87卷

基金：

日本学术振兴会; 新加坡国家研究基金会;

关键词：

Copper alloys; Fatigue; Grain boundaries; Crack initiation; Ni2Si precipitates; DYNAMIC EMBRITTLEMENT; ELECTRICAL-PROPERTIES; CYCLE FATIGUE; GROWTH LAW; BEHAVIOR; MICROCRACKS;

D O I：

10.1016/j.ijfatigue.2016.01.004

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Fatigue tests were conducted on round-bar specimens to understand the fatigue behavior of precipitate strengthened Cu-6Ni-1.5Si alloy. Aging at 500 degrees C for 0.5 h produced delta-Ni2Si precipitates in the matrix, homogeneously and heterogeneously precipitated delta-Ni2Si particles, and a precipitate-free zone around the grain boundaries. The cracks were initiated at the grain boundaries, followed by growth along the crystallographic slip planes in the adjacent grains. Crack propagation from the crack origin along the grain boundaries was occasionally observed. The physical background of fatigue damage is discussed in light of the role of microstructure on the behavior of fatigue cracks. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：15 / 21

页数：7

共 24 条

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