期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.12.019
关键词
Aluminium alloys; High pressure die casting; Mechanical property; Microstructure
类别
资金
- Engineering and Physical Sciences Research Council (EPSRC) [EP/I038616/1]
- Technology Strategy Board (TSB) [101172]
- Jaguar Land Rover (JLR), United Kingdom
- EPSRC [EP/I038616/1, EP/H026177/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I038616/1, EP/H026177/1] Funding Source: researchfish
A high strength Al-Mg2Si-Mg-Zn based alloy has been developed for the application in high pressure die casting to provide improved mechanical properties. The effect of various alloying elements on the microstructure and mechanical properties including yield strength, ultimate tensile strength and elongation of the alloy was investigated under the as-cast and heat-treated conditions. The typical composition of the high strength alloy has been optimised to be A1-8.0 wt%Mg2Si-6.0 wt%Mg-3.5 wt% Zn-0.6 wt%Mn (Al-11.0 wt%Mg-2.9 wt%Si-3.5 wt%Zn-0.6 wt%Mn) with unavoidable trace impurities. The mechanical properties of the alloy were enhanced by a quick solution treatment followed by ageing treatment. The improved tensile properties were at a level of yield strength over 300 MPa, the ultimate tensile strength over 420 MPa and the elongation over 3% assessed using international standard tensile samples made by high pressure die casting. The microstructure of the die-cast alloy consisted of the primary alpha-Al phase, Al-Mg2Si eutectics, AlMgZn intermetallics and alpha-AlFeMnSi intermetallics under the as-cast condition. The AlMgZn intermetallic compound was dissolved into the Al-matrix during solution treatment and subsequently precipitated during ageing treatment for providing the effective improvement of the mechanical properties. (C) 2014 Elsevier B.V. All rights reserved.
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