Solidification Microstructure and Mechanical Properties of Cast Magnesium-Aluminum-Tin Alloys
Metallurgical and Materials Transactions A(2011)
摘要
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 α -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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关键词
Ultimate Tensile Strength,AZ91 Alloy,Energy Dispersive Spectroscope,Mg17Al12 Phase,Ternary Eutectic Reaction
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