| FGH4096粉末高温合金的再结晶形核机制 |
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| 引用本文： | 宁永权,姚泽坤.FGH4096粉末高温合金的再结晶形核机制[J].金属学报,2012(8):1005-1010. |
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| 作者姓名： | 宁永权 姚泽坤 |
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| 作者单位： | 西北工业大学材料学院 |
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| 基金项目： | 国家自然科学基金项目51101119;中国博士后基金项目20110491686资助~~ |
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| 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γ’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.
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| 关 键 词： | 粉末高温合金 再结晶 形核机制 |
RECRYSTALLIZATION NUCLEATION MECHANISM OF FGH4096 POWDER METALLURGY SUPERALLOY |
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| NING Yongquan,YAO Zekun.RECRYSTALLIZATION NUCLEATION MECHANISM OF FGH4096 POWDER METALLURGY SUPERALLOY[J].Acta Metallurgica Sinica,2012(8):1005-1010. |
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| Authors: | NING Yongquan YAO Zekun |
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| Affiliation: | School of Material Science and Engineering,Northwestern Polytechnical University,Xi’an 710072 |
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| Abstract: | FGH4096 is regarded as a promising powder metallurgy superalloy for high-temperature/pressure turbine disc in aerospace industries due to its high resistance/defect tolerance and high working temperature up to 750℃.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 7’ 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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| Keywords: | powder metallurgy superalloy recrystallization nucleation mechanism |
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