Understanding the environmentally assisted cracking (EAC) initiation and propagation of new generation 7xxx alloys using slow strain rate testing

被引：25

作者：

Aboura, Y. ^{[1
]}

Garner, A. J. ^{[1
]}

Euesden, R. ^{[1
]}

Barrett, Z. ^{[2
]}

Engel, C. ^{[3
]}

Holroyd, N. J. H. ^{[1
,4
]}

Prangnell, P. B. ^{[1
]}

Burnett, T. L. ^{[1
]}

机构：

[1] Univ Manchester, Dept Mat, Manchester M13 9PL, England

[2] Airbus UK, Pegasus House ,Aerosp Ave, Filton, Bristol BS34 7PA, England

[3] Airbus Operat GmbH, Airbus Allee 1, D-28199 Bremen, Germany

[4] Case Western Reserve Univ, Dept Mat Sci & Engn, Cleveland, OH USA

来源：

CORROSION SCIENCE | 2022年 / 199卷

基金：

英国工程与自然科学研究理事会;

关键词：

Environmentally Assisted Cracking (EAC); Stress Corrosion Cracking (SCC); High strength aluminium alloys; Fractography; Hydrogen Embrittlement; STRESS-CORROSION CRACKING; AL-ZN-MG; CU ALUMINUM-ALLOYS; HYDROGEN-EMBRITTLEMENT; INTERMETALLIC PHASES; LOCALIZED CORROSION; HEAT-TREATMENT; BEHAVIOR; ALUMINUM-ALLOY-7050; MECHANISMS;

D O I：

10.1016/j.corsci.2022.110161

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

New generation (new-gen) 7xxx series alloys have recently been shown to have higher susceptibility to environmental assisted cracking (EAC) in humid air, compared to AA7050, in T7651 tempers. Hydrogen (H)-EAC fracture features of brittle intergranular (IG) and transgranular (TG) fracture modes were observed with humidity levels as low as 20%. Initiation was favoured at sites of intermetallic particle clusters with gas pores. The higher performance of AA7050 was attributed to the difficulty of initiation in this alloy, where the grain structure, combined with an intrinsic resistance of the grain boundaries to IG-EAC, made the attainment of sustained cracking difficult.

引用

页数：20

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