Fatigue crack propagation in ultrafine grained Al-Mg alloy

被引：67

作者：

Pao, PS ^{[1
]}

Jones, HN ^{[1
]}

Cheng, SF ^{[1
]}

Feng, CR ^{[1
]}

机构：

[1] USN, Res Lab, Dept Navy, Washington, DC 20375 USA

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2005年 / 27卷 / 10-12期

关键词：

fatigue crack growth; fatigue crack growth threshold; ultrafine grained material; microstructure; aluminum; GROWTH; DEFLECTION; STABILITY;

D O I：

10.1016/j.ijfatigue.2005.06.027

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The fatigue crack growth rates in ultrafine grained (UFG) Al-7.5Mg were investigated and were compared to those observed in powder-metallurgy (P/M) Al-7Mg and ingot-metallurgy (I/M) Al-7Mg. Fatigue crack growth rates in UFG AI-7.5Mg are significantly higher than those of P/M Al-7Mg, which, in turn, are significantly higher than those of I/M Al-7Mg. The fatigue crack growth threshold is the lowest in the UFG Al-7.5Mg, followed by P/M Al-7Mg, and is the highest in I/M Al-7Mg. The higher fatigue crack growth rates and lower thresholds in UFG Al-7.5Mg may be attributed to the much smoother fracture surface morphology and lower roughness-induced crack closure and crack deflection. Published by Elsevier Ltd.

引用

页码：1164 / 1169

页数：6

共 17 条

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