Corrosion-Fatigue Crack Growth in Age-Hardened Al Alloys: Examples of Failures and Explanations for Fractographic Observations

被引：4

作者：

Byrnes, Rohan ^{[1
]}

Goldsmith, Noel ^{[1
]}

Knop, Mark ^{[1
]}

Lynch, Stan ^{[1
]}

机构：

[1] Def Sci & Technol Org, Melbourne, Vic, Australia

来源：

11TH INTERNATIONAL FATIGUE CONGRESS, PTS 1 AND 2 | 2014年 / 891-892卷

关键词：

Corrosion Fatigue; Aluminium Alloys; Failures; Fractography; Cycle Frequency; Mechanisms; Adsorption-Induced Dislocation-Emission; ALUMINUM-ALLOYS; PROPAGATION;

D O I：

10.4028/www.scientific.net/AMR.891-892.248

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The characteristics of corrosion-fatigue in age-hardened Al alloys, e.g. brittle striations on cleavage-like facets, are described, with reference to two examples of component failure. Mechanisms of corrosion fatigue (and explanations for fracture-surface features) are then reviewed. New observations of corrosion-fatigue crack growth for 7050-T7451 alloy compact-tension specimens tested in aqueous environments using a constant ('intermediate') Delta K value but different cycle frequencies are then described and discussed. These observations provide additional support for a hydrogen-embrittlement process involving adsorption-induced dislocation-emission from crack tips.

引用

页码：248 / 253

页数：6