Precipitation microstructure in Al-Si-Mg-Mn alloy with Zr additions

被引：18

作者：

Voncina, Maja ^{[1
]}

Medved, Jozef ^{[1
]}

Kores, Stanislav ^{[2
]}

Xie, Pan ^{[3
]}

Schumacher, Peter ^{[3
,4
]}

Li, Jiehua ^{[3
]}

机构：

[1] Univ Ljubljana, Fac Nat Sci & Engn, Askerceva 12, Ljubljana 1000, Slovenia

[2] Talum Tovarna Aluminija DD Kidricevo, Tovarniska Cesta 10, Kidricevo 2325, Slovenia

[3] Univ Leoben, Chair Casting Res, A-8700 Leoben, Austria

[4] Austrian Foundry Res Inst, A-8700 Leoben, Austria

来源：

MATERIALS CHARACTERIZATION | 2019年 / 155卷

基金：

奥地利科学基金会;

关键词：

Al alloy; Phase selection; Precipitation; Ageing; TEM; AGE-HARDENING BEHAVIOR; MECHANICAL-PROPERTIES; ALUMINUM-ALLOY; PHASE; EVOLUTION; TI;

D O I：

10.1016/j.matchar.2019.109820

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The precipitation microstructure of Al-10Si-0.5 Mg-0.5Mn (wt%) alloys with different Zr additions was investigated. The beta-type (i.e. Mg2Si) phase was observed to be dominant in the precipitation microstructure. Furthermore, the Q-Al5Cu2Mg8Si6 phase and the pi-Al8Mg3FeSi6 phase were also observed to be the dominant thermodynamically stable precipitates at 180 degrees C. The main strengthening effect can be attributed to the Q-Al5Cu2Mg8Si6 and beta-type (i.e. Mg2Si) precipitates due to the fact that the pi-Al8Mg3FeSi6 phase is relatively large in size, plate-like in morphology, and low in number density and thereby volume fraction. More importantly, the Zr addition into the Al-Si-Mg-Mn alloys causes the precipitation to start at a lower temperature during ageing, which can be due to the grain refinement effect by Zr addition and thereby enhanced diffusion. This paper provides some insights in precipitation microstructure and thereby shortening the ageing treatment at a relatively low ageing temperature.

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页数：8

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