Fatigue crack initiation and propagation behaviors of solution-treated and air-cooled Cu-6Ni-1.5Si alloy strengthened by precipitation hardening

被引：8

作者：

Goto, M. ^{[1
]}

Iwamura, T. ^{[1
]}

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

Kim, S. ^{[3
]}

Yamamoto, T. ^{[1
]}

Lim, S. H. ^{[4
]}

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

Kitamura, J. ^{[1
]}

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

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

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

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2019年 / 123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; Solution heat treatment; Grain boundaries; Crack initiation; HIGH-CYCLE FATIGUE; NI-SI ALLOYS; MICROCRACKS; MICROSTRUCTURE; CONDUCTIVITY;

D O I：

10.1016/j.ijfatigue.2019.02.004

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 of a solution-treated and air-cooled Cu-Ni-Si alloy with high solute concentrations of 6% Ni and 1.5% Si. This alloy was strengthened by disc-shaped Ni2Si precipitates, a few tens of nanometers in diameter, formed during air cooling. The results were compared with those of a conventional solution-treated Cu-Ni-Si alloy cooled by water quenching. The correlation between the tensile and fatigue strengths of the two alloys differed completely from the general tendency that enhanced tensile strength brings an increase in fatigue strength. Indeed, the fatigue strength of the air-cooled Cu-Ni-Si alloy was 1.1 times higher than that of the water-quenched alloy, while the tensile strength was only 75% that of the water quenched alloy. Moreover, the electrical conductivity of the air-cooled specimens in International Annealed Copper Standard (LACS) percentage points was 1.7 times higher than that of the water-quenched specimens. The physical background for the superior fatigue strength of the air-cooled Cu-Ni-Si alloy, including the role of microstructure, is discussed.

引用

页码：135 / 143

页数：9

共 31 条

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