Effect of cyclic crack opening displacement rate on corrosion fatigue crack velocity and fracture mode transitions for Al-Zn-Mg-Cu alloys

被引：16

作者：

Hall, M. M., Jr. ^{[1
]}

机构：

[1] MacRay Consulting, Monroeville, PA 15146 USA

来源：

CORROSION SCIENCE | 2014年 / 81卷

关键词：

Aluminum; Modeling studies; Corrosion fatigue; Hydrogen embrittlement; Stress corrosion; ALUMINUM-ALLOYS; ASSISTED CRACKING; SUSTAINED-LOAD; HYDROGEN; PROPAGATION; DIFFUSION; BEHAVIOR; DUCTILE; GROWTH; ELECTROCHEMISTRY;

D O I：

10.1016/j.corsci.2013.12.014

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A time-domain analysis of corrosion fatigue data obtained by Holroyd and Hardie (1983) on Al-Zn-Mg-Cu alloy 7017-T651 shows that there is a correlation between Stage II crack velocity and cyclic crack opening displacement (COD)-rate. This correlation holds for all cyclic frequency-Delta K data combinations and fracture modes, suggesting that cyclic COD-rate, which is a function of both frequency and Delta K, is a more fundamental crack driving force variable. A diffusion-limited "critical hydrogen" embrittlement model is developed to rationalize effects of cyclic frequency on corrosion fatigue crack velocity and fracture mode transitions. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：132 / 143

页数：12

共 62 条

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