对Ni3Al基单晶合金IC6sx的表面进行吹砂变形处理; 再在800—1260℃热暴露1—10 h, 采用OM, SEM和EPM研究了IC6sx合金的再结晶行为. 结果表明, 合金再结晶开始形核的温度约1000 ℃, 一次再结晶完成的温度为1200—1210℃. 在1200—1240℃热暴露时的再结晶层厚度约为10 m, 而在1260 ℃热暴露时增长到约23 m. 再结晶在枝晶干长大的速度明显小于枝晶间, 再结晶层和基体的枝晶干之间观察到一种由粗大条状γ'相和γ+γ'相构成的胞状转变结构, 这是由于枝晶干中粗大的γ'相阻碍再结晶向基体内生长形成的.
The surface recrystallization in a Ni3Al base single crystal alloy IC6SX which is developed for advanced aeroengine turbine blades and vanes has been studied. The specimens were cold worked by grit blasting and then heat treated in the temperature range of 800-1260℃ for 1h to 10h. The experiment results showed that initial recrystallization nucleation temperature was about 1000℃ and the primal recrystallization completing temperature was between 1200-1210℃.It has been found that the recrystallization grain size increased significantly with increasing temperature. However, the thickness of recrystallization layer almost kept to be 10 μm in the temperature range of 1200-1240℃ for 1h, and increased fast with increasing temperature above 1240℃ i.e., the thickness of recrystallization layer was ～23μm after 1260℃/10h. The results indicated that different from the recrystallization behavior in most common Ni-base superalloys, the recrystallization grains in the interdendritic region grew faster than in the dendritic core. It was observed that a cellular transformation formed in the interface between recrystallization grain and the dendritic core.
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