Two-stage double peaks ageing and its effect on stress corrosion cracking susceptibility of Al-Zn-Mg alloy

被引：54

作者：

Wang, Y. L. ^{[1
,2
]}

Jiang, H. C. ^{[1
]}

Li, Z. M. ^{[1
]}

Yan, D. S. ^{[1
]}

Zhang, D. ^{[1
,2
]}

Rong, L. J. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China

[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2018年 / 34卷 / 07期

基金：

国家重点研发计划;

关键词：

Al-Zn-Mg alloy; Two-stage ageing; Double peaks ageing; Stress corrosion cracking (SCC) susceptibility; Grain boundary precipitates (GBPs); ALUMINUM-ALLOYS; HEAT-TREATMENT; HYDROGEN EMBRITTLEMENT; MECHANICAL-PROPERTIES; CU; MICROSTRUCTURE; RESISTANCE; BEHAVIOR; PREDEFORMATION; PRECIPITATION;

D O I：

10.1016/j.jmst.2017.05.008

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Different artificial two-stage ageing behaviors and their effect on stress corrosion cracking (SCC) susceptibility of Al-Zn-Mg alloy have been investigated. The experimental results show that two hardness peaks present on the second-stage ageing-hardening curve when the first-stage ageing is dealt with comparatively lower temperature than the conventional one. The first peak is caused by dispersive and evenly distributed G.P. zones, while eta ' phases and coarsened G.P. zones contribute to the second peak. Tensile strength of experimental alloy raises 9.6% (33.2 MPa) and SCC susceptibility decreases 38.9% by applying the second peak ageing regime instead of conventional T73. Al-Zn-Mg alloy obtains high strength and SCC resistance due to its finely dispersive matrix precipitates (MPts), coarsened and discontinuous grain boundary precipitates (GBPs), as well as the narrow precipitate free zone (PFZ) in the second peak ageing condition. (C) 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

引用

页码：1250 / 1257

页数：8

共 42 条

[1] Improved resistance to stress-corrosion-cracking failures via optimized retrogression and reaging of 7075-T6 aluminum sheets [J].