Insight into the partial solutionisation of a high pressure die-cast Al-Mg-Zn-Si alloy for mechanical property enhancement

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• 作者：Wenchao Yang^a ; ^b ; Lin Liu^a ; Jun Zhang^a ; Shouxun Ji^b ; ^c ; ^{shouxun.ji@brunel.ac.uk}
• 关键词：Aluminium alloys ; Mechanical property ; Microstructure ; Heat treatment ; High pressure die-casting
• 刊名：Materials Science and Engineering: A
• 出版年：2017
• 出版时间：13 January 2017
• 年：2017
• 卷：682
• 期：Complete
• 页码：85-89
• 全文大小：1376 K
• 卷排序：682

文摘

A partial solution treatment was investigated to enhance the mechanical properties for a die-cast Al-Mg-Zn-Si alloy. The strengthening mechanism was identified that the Mg32(Al, Zn)49 intermetallics and equilibrium η-MgZn2 phase formed in the as-cast microstructure were partially dissolved into the α-Al matrix during solutionising and the fine semi-coherent η'-MgZn2 phase was precipitated during subsequent aging. Consequently, the unique microstructure was characterised by the co-existence of equilibrium η-MgZn2 phase and metastable η'-MgZn2 phase in the α-Al matrix, together with the un-changed Mg2Si eutectic and remnant Mg32(Al, Zn)49 intermetallics in the Al-Mg-Zn-Si alloy.