Microstructure Evolution of Conventional and Semi-Solid A356 Alloy with Addition of Strontium

Abstract:

In this study, modification of aluminium silicon eutectic alloy by grain modifier, strontium was investigated on conventional and slope cast A356 alloy. A356 alloy with addition of 0 to 0.97 wt.% Sr was prepared by conventional and slope casting in melting furnace. The molten metal of A356 alloy was casted into steel mould. Microstructure was observed using SEM. Phase analysis was done using XRD. Microhardness was conducted using Vicker microhardness. Microstructure of conventional cast displayed dendritic structure whereas slope cast displayed globular structure. Addition of Sr refined eutectic structure in both conventional and slope cast alloy. Phase analysis revealed the presence of Al2Sr phase in conventional cast Al-6Si-0.97Sr. Microhardness of the conventional cast alloy decreased with increasing of Sr up to 0.97 wt.%.

• Periodical: Advanced Materials Research (Volume 1087)
• Pages: 488-492
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1087.488
• Online since: February 2015
• Authors: Yuan Sieng Seo, Laila Masrur Mohd Nasir, Zuhailawati Hussain, Abu Seman Anasyida*
• Keywords: A356 Aluminum Alloy, Cooling Slope, Globular, Semi-Solid, Strontium

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