|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||D-66: Microstructures and Mechanical Properties of Low Si Content Al-Si-Mg Alloy
||Jia Lina, Zhang Hu, Zhou Li
|On-Site Speaker (Planned)
In order to develop a novel Al-Si cast alloy as a substitution of A356, the mechanical properties and strengthening mechanism of a low Si content (Al-3Si-0.5Mg-0.2Cr) alloy were studied and investigated. The wheels and heat-treated alloys presented similar microstructure. For the Al-3Si-0.5Mg-0.2Cr alloy, the main Fe-rich precipitations contained α-Al12(Fe,Cr)3Si2 and π-Al8FeMg3Si6, while in A356 alloy were β-Al9Fe2Si2 and β-Al5FeSi. The Cr and Mg additions promoted the transformation and the morphology optimum control of Fe-rich phases. And the strengthening phase β’-Mg2Si were coherent with the Al lattice in one Al and Al direction. The ultimate tensile strength and yield strength of Al-3Si-0.5Mg-0.2Cr wheel were insignificantly increased compared with A356 wheel. The large SDAS and shrinkage pores caused the elongation of Al-3Si-0.5Mg-0.2Cr alloy lower than expected value. The insufficient pressure of low-press-casting process, which results in cast defects and relatively low cooling rate, was a remarkable effect on the ductility.
||Planned: Light Metals