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
收藏
页码：248 / 253
页数：6
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