【摘要】 综述了包晶合金定向凝固中包晶相的形核与生长机制,讨论了利用最高界面生长温度假设以及成分过冷和充分形核判据下包晶合金的微观组织与相选择规律,对包晶相的 3 种生长机制进行了分析,并在 Sn-Cu 包晶合金定向凝固实验中发现其包晶反应不仅存在于凝固界面处,在后续冷却过程中也能进行,最后针对国内外包晶合金定向凝固研究的现状,提出了其需要进一步研究的问题。更多还原

【Abstract】 Directional solidification of peritectic alloy described is significant for advanced materials processing. The nucleation andgrowth mechanisms of peritectic phase are outlined and the nucleation undercooling of peritectic phase is small as a result of the presenceof properitectic phase nuclei. On the basis of assuming maximal interface growth temperature or nucleation and constitutionalundercooling criterion (NCU), the microstructure and phase selection of peritectic alloy have been considered. It was found that theperitectic reaction as one of the growth mechanisms of peritectic phase existed not only at the S/L interface, but also in the directionallysolidified sample of Sn-Cu peritectic alloy. Finally, the problems for directional solidification of peritectic alloys were presented to deeplyand rigorously explore the solidification theory and experiment of peritectic alloy.更多还原