Microstructure Evolution of Primary γ′ Phase in Ni3Al-Based Superalloy  

作　　者：Xin He Jianbo Zhang Yuanyi Peng Jingan Li Jian Ding Chang Liu Xingchuan Xia Xueguang Chen Yongchang Liu 

机构地区：[1]School of Material Science and Engineering,Hebei University of Technology,Tianjin 300130,China [2]School of Material Science and Engineering,Tianjin University,Tianjin 300130,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2020年第12期1709-1726,共18页金属学报（英文版）

基　　金：financially supported by the Natural Science Foundation of Hebei Province(No.E2019202161);the Highlevel Talent Funding Project of Hebei Province(No.A201902008);the Key R&D Program of Hebei Province(No.19251013D);the College Student Innovation and Entrepreneurship Training Program of Hebei University of Technology(No.S201910080035);the National Key R&D Program of China(No.2018YFB2001805)。

摘　　要：In this work,water cooling,air cooling(AC)and furnace cooling(FC)were applied to investigate the effect of cooling rate on microstructure evolution of primaryγ′in a newly designed Ni3Al-based alloy.The results showed that nucleation rate of primaryγ′increased with increasing cooling rate.In addition,higher cooling rate shortened growth period of primaryγ′,which made its morphology close to the initial precipitatedγ′.For AC and FC specimens,due to the lower cooling rate,primaryγ′possessed longer growth period and its morphology was mainly due to the evolution of lattice misfit betweenγand primaryγ′.Meanwhile,growth of primaryγ′depended on lattice misfit distribution between its corner and edge area.Moreover,primaryγ′morphologies of sphere,cube and concave cube with tip corners were illustrated by considering interaction between elemental diffusion and elastic strain energy.

关 键 词：Ni3Al-based alloy Primaryγ′ Cooling rate Nucleation rate Lattice misfit 

分 类 号：TG132.3[一般工业技术—材料科学与工程]