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

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:682

Article

Yang, Wenchao^1,2  Liu, Lin¹  Zhang, Jun¹  Ji, Shouxun^2,3 

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

[2] Brunel Univ London, Inst Mat, Brunel Ctr Adv Solidificat Technol, Uxbridge UB8 3PH, Middx, England

[3] Brunel Univ London, Coll Engn, Dept Mech Engn Aerosp & Civil Engn, Uxbridge UB8 3PH, Middx, England

关键词: Aluminium alloys;    Mechanical property;    Microstructure;    Heat treatment;    High pressure die-casting;   

DOI  :  10.1016/j.msea.2016.11.028

来源: Elsevier

【 摘 要 】

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 Mg-32(Al, Zn)(49) intermetallics and equilibrium eta-MgZn2 phase formed in the as-cast microstructure were partially dissolved into the alpha-Al matrix during solutionising and the fine semi-coherent eta'-MgZn2 phase was precipitated during subsequent aging. Consequently, the unique microstructure was characterised by the co-existence of equilibrium eta-MgZn2 phase and metastable eta-MgZn2 phase in the alpha-Al matrix, together with the un-changed Mg2Si eutectic and remnant Mg-32(Al, Zn)(49) intermetallics in the Al-Mg-Zn-Si alloy.

【 授权许可】

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