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http://dx.doi.org/10.7777/jkfs.2012.32.6.289

Effect of Cerium on the Microstructure and Room Temperature Tensile Properties of Mg-4Al-2Sn-1Si Alloys  

Kim, Jung-Hoon (Department of Materials Science and Engineering, Pusan National University)
Cho, Dae-Hyun (Department of Materials Science and Engineering, Pusan National University)
Park, Ik-Min (Department of Materials Science and Engineering, Pusan National University)
Publication Information
Journal of Korea Foundry Society / v.32, no.6, 2012 , pp. 289-295 More about this Journal
Abstract
Mg-Al-Sn-Si system alloy, as a promising cheap heat-resistant Mg alloy for automobile engine part, has been investigated. Refinement of microstructure and precipitation of thermally stable secondary phases are important goal for the design of heat-resistant Mg alloy. In this study, the effect of Ce on the microstructure and room temperature mechanical properties of Mg-Al-Sn-Si alloy was investigated. High thermally stable $Mg_2Si$ phases in Mg-Al-Sn-Si alloy is very useful intermetallic compound. However, the $Mg_2Si$ phases often result in poor mechanical properties due to the coarse chinese type $Mg_2Si$ phases. The experimental specimens were fabricated by fluxless melting under $CO_2+SF_6$ atmosphere and poured into the permanent pre-heated at $200^{\circ}C$. It was told that Ce addition can modify $Mg_2Si$ phases and refine microstructure and improve the tensile strength, yield strength and elongation.
Keywords
Heat resistant Mg alloy; $Mg_2Si$ phase; Modification;
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