Mitigating Intergranular Stress Corrosion Cracking in Age-Hardenable Al-Zn-Mg-Cu Alloys

被引：26
|
作者：
Krishnan, M. Ajay [1 ]
Raja, V. S. [1 ]
Shukla, Shweta [1 ]
Vaidya, S. M. [2 ]
机构：
[1] Indian Inst Technol, Dept Met Engn & Mat Sci, Bombay 400076, Maharashtra, India
[2] Godrej Aerosp, Bombay 400076, Maharashtra, India
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2018年 / 49A卷 / 06期
关键词：
HYDROGEN EMBRITTLEMENT; ALUMINUM-ALLOYS; SCC-RESISTANCE; STRENGTH; BEHAVIOR; SUSCEPTIBILITY; RETROGRESSION; ELECTROCHEMISTRY; PRECIPITATION; IMPROVEMENTS;
D O I：
10.1007/s11661-018-4601-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This article reports an attempt to develop high-strength aluminum alloys of 7xxx series resistant to intergranular stress corrosion cracking (SCC). A novel aging technique reported in this work exhibited improved strength levels (as high as similar to 100 MPa to that of conventional overaged temper for AA 7050) with significant resistance to SCC measured even at a low strain rate (10(-7) s(-1)) in 3.5 wt pct NaCl. The novel aging heat treatment produced a microstructure that is finer and dense enough in the matrix to impart strength, whereas it is enriched with Cu on the grain boundaries to impart SCC resistance. A detailed explanation for the enhanced strength and SCC resistance is discussed. (C) The Minerals, Metals & Materials Society and ASM International 2018
引用
收藏
页码：2487 / 2498
页数：12
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