Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 43A, Issue 1, Pages 360-368Publisher
SPRINGER
DOI: 10.1007/s11661-011-0820-y
Keywords
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Funding
- General Motors Global Research and Development (GM RD), Warren, MI
- Shanghai Jiao Tong University (SJTU), Shanghai, China
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The solidification microstructure and mechanical properties of as-cast Mg-Al-Sn alloys have been investigated using computational thermodynamics and experiments. The as-cast microstructure of Mg-Al-Sn alloys consists of alpha-Mg, Mg(17)Al(12), and Mg(2)Sn phases. The amount of Mg(17)Al(12) and Mg(2)Sn phases formed increases with increasing Al and Sn content and shows good agreement between the experimental results and the Scheil solidification calculations. Generally, the yield strength of as-cast alloys increases with Al and Sn content, whereas the ductility decreases. This study has confirmed an early development of Mg-7Al-2Sn alloy for structural applications and has led to a promising new Mg-7Al-5Sn alloy with significantly improved strength and ductility comparable with commercial AZ91 alloy.
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