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首页> 外文期刊>Materials and Manufacturing Processes >Understanding the Evolution of the Microstructure in Melt-Conditioned Direct-Chill Cast Al Alloys
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Understanding the Evolution of the Microstructure in Melt-Conditioned Direct-Chill Cast Al Alloys

机译：了解熔融条件直接冷铸铝合金的微观组织演变

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摘要

Present work focuses on understanding the solidification mechanism responsible for the grain-refinement in melt-conditioned direct chill (MC-DC) cast Al-alloy. It has been found that the melt-conditioning performed by stirring the liquid above the solidification front using a rotor-stator type melt-conditioning device, results in substantial fragmentation of dendrites due to forced convection and thermo-solutal distribution across the billet sump. Results also indicate that an isothermal region is created in the MC-DC regime of the billet sump, which further enhances the nucleation and restricts growth of the α-Al phase. The forced convection together with the solute transport lead to catastrophic dendrite fragmentation.
机译：目前的工作着重于了解熔体条件直接冷却（MC-DC）铸造铝合金中负责晶粒细化的凝固机制。已经发现，通过使用转子-定子型熔融调节装置在凝固前沿上方搅拌液体而进行的熔融调节，由于强制对流和整个坯料贮槽的热固溶分布而导致树枝状晶体的大量碎裂。结果还表明，在坯料槽的MC-DC区域中创建了一个等温区，这进一步增强了成核作用并限制了α-Al相的生长。强制对流与溶质运移一起导致灾难性的枝晶碎裂。

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