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金属学报 2006
Research on Grain Refinement Mechanism in Undercooled Fe75Ni25 Alloy
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Abstract:
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 if T>56K, can be ascribed to the breakup of dendrite-skeleton owing to remelting, whereas the second grain refinement was caused by recrystallization induced by the stress originating from the rapid solidification contraction with T>209K.
