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Zhongping Que,Jiho Gu,Jongho Shin,정연길,Jehyun Lee 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.1
Directional solidification experiments of a binary Ni-23at.%Al alloy were carried out to examine the effectsof growth velocity on the microstructure selection in the interdendritic region. Only the growth velocity waschanged from 5 µm/s to 60 µm/s under a given thermal gradient. As a result, the noticeable change in themicrostructure during solidification occurred between the γ dendrites. The γ interdendritic microstructure wasvaried as a function of growth velocity from rod γ-γ' coupled peritectic structure to planar γ' structure andthen to eutectic structures consisting of stable γ'-β eutectic and metastable γ-β‚ eutectic structures. Themicrostructure selected preferentially among the γ dendrites was considered by calculating the interfacetemperature of a phase growing into its parent melt. It is shown that the microstructure selection in the γinterdendritic region is determined by a phase or a structure kinetically leading at the highest interfacetemperature under a given growth condition.