Mechanical Properties and Microstructure of Mg-Al-Zn-Si-base Alloy

摘要: Magnesium alloys containing Mg2Si particles, as a promising low cost heat-resistant magnesium alloy for automobile engine applications, are attracting more and attention of both material scientists design engineers. Refinement the Chinese script particle is key using this kind in sand casting or permanent mould casting. In present work, new type with based on Mg–Al–Zn–Si was developed. The effect Sb addition mischmetal (MM, mixture rare-earth, RE elements) microaddition to investigated systematically from viewpoints microstructure, solidification process, mechanical properties corrosion resistance. Microstructure observation revealed that promoted formation fine polygonal particles by providing nucleation sites. Meanwhile, grain sizes modified Mg–Al–Zn–Si–Sb much finer than those base alloy. Such improved microstructure brings about significant improvement tensile properties, toughness creep resistance at elevated temperatures up 200 � C, which superior comparable AE42 Moreover, significantly MM microaddition.