TY - JOUR

T1 - Precipitation microstructure in Al-Si-Mg-Mn alloy with Zr additions

AU - Vončina, Maja

AU - Medved, Jožef

AU - Kores, Stanislav

AU - Xie, Pan

AU - Schumacher, Peter

AU - LI, Jiehua

N1 - Publisher Copyright: © 2019 Elsevier Inc.

PY - 2019/9

Y1 - 2019/9

N2 - The precipitation microstructure of Al-10Si-0.5 Mg-0.5Mn (wt%) alloys with different Zr additions was investigated. The β-type (i.e. Mg 2Si) phase was observed to be dominant in the precipitation microstructure. Furthermore, the Q-Al 5Cu 2Mg 8Si 6 phase and the π-Al 8Mg 3FeSi 6 phase were also observed to be the dominant thermodynamically stable precipitates at 180 °C. The main strengthening effect can be attributed to the Q-Al 5Cu 2Mg 8Si 6 and β-type (i.e. Mg 2Si) precipitates due to the fact that the π-Al 8Mg 3FeSi 6 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.

AB - The precipitation microstructure of Al-10Si-0.5 Mg-0.5Mn (wt%) alloys with different Zr additions was investigated. The β-type (i.e. Mg 2Si) phase was observed to be dominant in the precipitation microstructure. Furthermore, the Q-Al 5Cu 2Mg 8Si 6 phase and the π-Al 8Mg 3FeSi 6 phase were also observed to be the dominant thermodynamically stable precipitates at 180 °C. The main strengthening effect can be attributed to the Q-Al 5Cu 2Mg 8Si 6 and β-type (i.e. Mg 2Si) precipitates due to the fact that the π-Al 8Mg 3FeSi 6 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.

UR - http://www.scopus.com/inward/record.url?scp=85069562458&partnerID=8YFLogxK

U2 - 10.1016/j.matchar.2019.109820

DO - 10.1016/j.matchar.2019.109820

M3 - Article

VL - 155.2019

JO - Materials characterization

JF - Materials characterization

SN - 1044-5803

IS - September

M1 - 109820

ER -