Correlation of microstructure with corrosion performance in high zinc 7068 aluminum alloy aged using different T6 conditions

被引：22

作者：

Kumar, Ankur ^{[1
]}

Chaudhari, Gajanan P. ^{[1
]}

Nath, S. K. ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Met & Mat Engn, Roorkee 247667, Uttar Pradesh, India

来源：

MATERIALS CHARACTERIZATION | 2022年 / 191卷

关键词：

7068 Al-Zn-Mg-Cu alloy; DSC; TEM; Mechanical properties; Precipitate distribution; Intergranular corrosion; MG-CU ALLOY; INTERGRANULAR CORROSION; HYDROGEN EMBRITTLEMENT; DISSOLUTION PHENOMENA; HARDENING RESPONSE; PITTING CORROSION; HEAT-TREATMENTS; BEHAVIOR; PRECIPITATION; CRACKING;

D O I：

10.1016/j.matchar.2022.112133

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High-strength 7068 aluminum alloy containing > 7 wt% zinc deserves evaluation of its SCC performance in different ageing conditions, because of reported less effectiveness of over-ageing in newly developed high-zinc 7xxx series alloys. Microstructural features resulting from different ageing treatments are correlated with mechanical properties, localised corrosion behaviour, and SCC susceptibility. Localised attack manifested in dissolution of second phase precipitates which occurs from selective leaching of magnesium and aluminum. The micro-galvanic effect of iron-containing precipitates on the matrix dissolution is less as compared to Al2MgCu phase. Peak and overaged alloy exhibited higher resistance to intergranular corrosion and SCC because of discontinuous grain boundary precipitates and fewer Al2MgCu/alpha-Al micro-galvanic couples.

引用

页数：17

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