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首页> 外文期刊>Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing >Dross formation during remelting of aluminum 5182 remelt secondary ingot (RSI)
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Dross formation during remelting of aluminum 5182 remelt secondary ingot (RSI)

机译：铝5182重熔二次锭（RSI）重熔过程中形成的结渣

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摘要

This article reports, for the first time, a surprising result that in the center part of some commercial aluminum 5182 remelt secondary ingot (RSI), more than 50 percent of the alloy turns to dross during melting. The solidification microstructure of the RSI was characterized in order to understand where the dross comes from and how it forms. Optical microscopy showed that severe interdendritic porosities and hot tears exist in the RSI. These cavities provide continuous channels that expose the internal interdendritic surfaces to the atmosphere outside of RSI~ SEM revealed that the dendrites in the center of RSI are covered by magnesium and aluminum oxides. It is the oxidation of the surfaces of the interdendritic pores that results in a large amount of dross formation during the remelting of aluminum 5182 RSI.
机译：本文首次报道了令人惊讶的结果，即在某些商业铝5182重熔二级锭（RSI）的中心部分，超过50％的合金在熔化过程中变成渣s。对RSI的凝固组织进行了表征，以了解锡渣来自何处以及如何形成。光学显微镜显示，RSI中存在严重的树枝状孔隙和热裂缝。这些腔提供了连续的通道，该通道将内部的树枝状表面暴露于RSI以外的大气中。SEM显示RSI中心的树枝状晶体被镁和氧化铝覆盖。铝5182 RSI重熔期间，正是枝晶间孔表面的氧化导致大量锡渣的形成。

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