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首页> 外文会议>TMS(The Minerals, Metals amp; Materials Society) Annual Meeting and Symposium on Solidification of Aluminum Alloys; 20040314-20040318; Charlotte,NC; US >Nucleation and Growth Temperature and the Formation of Microstructure in Steady State Solidification of Aluminum-based Alloys
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Nucleation and Growth Temperature and the Formation of Microstructure in Steady State Solidification of Aluminum-based Alloys

机译：铝基合金稳态凝固过程中的成核生长温度及其微观组织的形成

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摘要

Recent work (primarily by the author and his collaborators) on measurement of formation temperature of constituents of Al-based alloys under Bridgman solidification conditions is reviewed. Together with associated microstructural observations, the results indicate control by heterogeneous nucleation in the case of polygonal primary silicon in Al-18.3wt % Si alloy, while competitive growth is controlling in the case of aluminide dendrites in Al-Fe, Al-Ni and Al-Ce or La alloys, for which measured tip undercoolings are in good agreement with values calculated from dendrite growth models. Extrapolation to zero growth velocity of measured growth temperatures of eutectics in such systems agree closely with reliable values by other methods and values of kinetic constants A and B_(EU) for dendrites and eutectic derived from measured velocities for extinction of the dendritic constituent are shown to be in accord with direct measurements. The sometimes dramatic effects of ternary alloy or trace additions remain to be fully explored.
机译：综述了有关在Bridgman凝固条件下测量Al基合金成分形成温度的最新工作（主要由作者和他的合作者完成）。连同相关的微观结构观察结果，结果表明在Al-18.3wt％Si合金中，多边形原生硅的情况下，通过异质形核控制，而在Al-Fe，Al-Ni和Al中的铝化物枝晶的情况下，竞争性增长受到控制。 -Ce或La合金，其测得的尖端过冷度与根据枝晶生长模型计算出的值非常吻合。在这样的系统中，将共晶的测量生长温度外推至零生长速度与通过其他方法得出的可靠值非常吻合，并且显示出由测量速度得出的，用于树突成分消失的树突和共晶的动力学常数A和B_（EU）的值如下：与直接测量一致。三元合金或微量添加物有时会产生巨大的影响，有待充分研究。

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