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Influence of Cooling Velocity on Solidification Structure of Eutectic Component Mg-Al Alloy Containing Rare Earth Nd

MA Shi-hui(Department of Mechanical Engineering,Chengde Petroleum College,Chengde 067000,Hebei,China)  
In this article,components of semi-solid AZ91 magnesium alloy liquid during the latter term of solidification have been simulated,and the changes of solidification microstructures at different cooling velocity have been analyzed when rare earth metal Nd of 1.0%wt was added to Mg-Al alloy.The results show that,solidification microstructures adopting graphite mould casting was obviously small compared with sand mould casting;tree crystal αwas relatively giant and eutectic microstructure was relatively densified;there was tree crystal αcontaining high Al at sand mould casting.
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