Revealing the Void Formation Mechanism during Superplastic Deformation of a Fine-Grained Ni-Co-Base Superalloy  

作　　者：Rashad AAl-Hammadi Rui Zhang Chuanyong Cui Zijian Zhou Yizhou Zhou 

机构地区：[1]Shi-Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2024年第5期915-920,共6页金属学报（英文版）

基　　金：financial support from the National Key R&D Program of China(2019YFA0705300);the Youth Innovation Promotion Association,CAS(No.2023202);the Natural Science Foundation Project of Liaoning Province(No.2023-MS-024).

摘　　要：The mechanism behind void formation during superplasticity remains a subject of uncertainty.This study presented a novel insight into the void formation in a fine-grained Ni-Co-based superalloy during superplasticity.It was observed that the dissolution ofγ′-particles resulted in the creation of vacancies due to differences in atomic size between the matrix and the particles.These vacancies acted as inclusions,leading to the formation of micro-voids.Notably,excessive void formation correlated with higher particle dissolution was experimentally observed,highlighting a direct relationship between void formation and particle dissolution.

关 键 词：SUPERPLASTICITY Void formation Ni-Co-based superalloy Microstructure 

分 类 号：TG142.1[一般工业技术—材料科学与工程]