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中文摘要：
采用熔融玻璃净化结合循环过热的方法，对过冷Fe75Ni25合金的晶粒细化机制进行了系统的研究，在所获得的过冷度范围内，发现了两次晶粒细化现象，基于理论计算和对实验结果的分析，系统考察了合金的晶粒细化机制，结果表明，第一次晶粒细化（56K〈△T〈145K），是由于重熔引起的枝晶骨架的破断；而第二次晶粒细化（△T〉209K），则是快速凝固收缩产生的应力导致枝晶碎断，并在应变激活能和晶格畸变能的共同作用下引发再结晶的结果。
英文摘要：
The grain refinement mechanisms of undercooled Fe75Ni25 alloys were investigated by fluxing and cyclic superheating. Within the undercooling, △T, range achieved, two kinds of grain refinement were observed. In combination with the calculation and the analysis of experiment results, the grain refinement mechanisms were elucidated. The results indicate that the first grain refinement, occurring at 56 K〈 △t 〈145 K, can be ascribed to the breakup of dendrite-skeleton owing to remelting, and the second grain refinement at △T 〉209 K, was due to the recrystallization induced by the stress originating from the rapid solidification contraction.
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