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中文摘要：
利用OM和TEM对FGH4096粉末高温合金的再结晶组织进行了系统的观察和分析，证实有3种再结晶形核机制存在，即原始颗粒边界形核、应变诱导蝶状，y1相形核和孪晶叠加形核．通过研究微观偏析，弯曲褶皱边界的形成和孪晶叠加效应，原子扩散和位错运动建立了形核模型．
英文摘要：
FGH4096 is regarded as a promising powder metallurgy superalloy for hightemperature/pressure turbine disc in aerospace industries due to its high resistance/defect tolerance and high working temperature up to 750 °C. In the present work, OM and TEM have been employed to study the recrystallization nucleation and microstructure evolution in FGH4096 powder metallurgy superalloy. It is proved that there exist three types of recrystallization mechanisms： nucleation from previous particle boundary （PPB）, strain-induced nucleation from butterfly .yt phase （SIP） and twins superposition （TS） nucleation. The physical explanation for this is given from the view of point of micro-segregation, formation of the bend fold boundary and twins superposition, atomic diffusion and dislocation movement.
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