Stability of γ′ multimodal microstructure in a Ni-based powder metallurgy superalloy

作     者：ZHANG Ming LIU GuoQuan WANG Hao HU BenFu 

作者机构：School of Materials Science and Engineering University of Science and Technology Beijing 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2018年第61卷第12期

页      面：1824-1828页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Key Research and Development Program of China(Grant No.2016YFB0700505) the National Natural Science Foundation of China(Grant No.51571020) the State Key Laboratory for Advanced Metals and Materials(Grant No.2016-Z05) the fund of the Guangdong Provincial Key Laboratory for Technology and Application of Metal Toughening(Grant No.GKL201611) 

主　　题：Nickel alloys γ′ phase multimodal size distribution microstructure stability 

摘      要：Multimodal size distribution of γ′ phase was obtained in a slow-cooling experiment following supersolvus solution treatment(1191°C). The morphology of the secondary γ′ particles exhibited splitting and protrusion instabilities. In the subsequent aging process(815°C), reverse coarsening was observed, i.e., the average precipitate size decreased with increasing aging *** coarsening slows the coarsening rate of the precipitates, increases the hardness of the alloy, and greatly improves the morphological stability of the γ′ phase.