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首页> 外文期刊>Advances in materials science and engineering >Surface Crystallization in Mg-Based Bulk Metallic Glass during Copper Mold Casting
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Surface Crystallization in Mg-Based Bulk Metallic Glass during Copper Mold Casting

机译：铜基铸造过程中镁基大块金属玻璃的表面结晶

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摘要

The localized crystallization of Mg54Cu28Ag7Y11bulk metallic glass (BMG) in the injection casting process using a copper mold was investigated. It has been found that several crystalline phases were formed close to the as-cast surface but did not exist in the internal part of the BMG plate. It is abnormal that the as-cast surface is partially crystallized with higher cooling rate than that of inside. Overheating of the melt and nucleation induced by the surface of copper mold play key roles in the abnormal crystallization. It is suggested that the function of copper mold to trigger heterogeneous nucleation cannot be totally ignored, although it provides the high cooling rate for the glass formation during casting.
机译：研究了Mg54Cu28Ag7Y11bulk金属玻璃（BMG）在使用铜模的铸造过程中的局部结晶。已经发现，在铸态表面附近形成了几个结晶相，但在BMG板的内部不存在。铸态表面以高于内部的冷却速率结晶的部分结晶是异常的。铜模表面引起的熔体过热和成核在异常结晶中起关键作用。尽管铜铸模为铸造过程中的玻璃形成提供了很高的冷却速率，但它却不能完全忽略铜铸模触发异质形核的功能。

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