液態(tài)金屬深過冷快速凝固過程中初生固相的重熔

液態(tài)金屬深過冷快速凝固過程中初生固相的重熔Remelting of Primary Solid in Rapid Solidification of Deeply Undercooled Alloy Melts

深過冷液態(tài)金屬（合金）凝固時(shí)伴隨有顯著的溫度再輝，初生固相因此不可避免部分被重熔，從而影響到最終凝固組織形態(tài)。近年來(lái)，過冷熔體中晶體生長(zhǎng)理論模型不斷完善，使得定量分析初生固相重熔程度隨過冷度的變化規(guī)律成為可能，本文即對(duì)這方面的研究工作進(jìn)展進(jìn)行綜述，并結(jié)合某些合金在不同過冷度下晶體生長(zhǎng)行為及其凝固組織的實(shí)驗(yàn)結(jié)果，對(duì)典型非平衡凝固組織的形成機(jī)制進(jìn)行闡述。

Solidification of deeply undercooled alloy melts proceeds with obvious temperature recalescence, during which part of primary solid is inevitably remelted, and the microstructural morphology is inevitably changed. During past decades, great improvement was achieved in modelling crystal growth in undercooled alloy melts, making it possible to quantitatively evaluate the remelting degree of primary solid at different undercoolings. In this paper, the progress in modelling the remelting of primary solid was introduced, and the variation of remelted fraction of primary solid as a function of the alloy feature and undercooling was presented. In combination with experimental results of crystal growth pattern and solidification structure in selected alloys, the mechanisms for grain refinement in undercooled single-phase alloys and anomalous eutectic formation in undercooled eutectic alloys were then discussed.

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