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Deformation Mechanism of L1 2 ‐ γ ′ Phase in Bimodal γ ″‐ γ ′ Precipitation Hardened Inconel 718 Superalloy
Author(s) -
Zhang Hongjun,
Li Chong,
Guo Qianying,
Li Huijun,
Liu Yongchang
Publication year - 2018
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201800652
Subject(s) - materials science , inconel , superalloy , alloy , shearing (physics) , high resolution transmission electron microscopy , transmission electron microscopy , precipitation , precipitation hardening , deformation mechanism , deformation (meteorology) , metallurgy , phase (matter) , crystallography , composite material , microstructure , nanotechnology , physics , chemistry , organic chemistry , meteorology
Deformation mechanism of L1 2 ‐ γ ′ phase in bimodal γ ″‐ γ ′ precipitation hardened Inconel 718 alloy is characterized through high resolution transmission electron microscopy (HRTEM) observations. The spherical γ ′ particle exhibits morphological transition toward ellipsoid along the <110> direction and shows deformation anisotropy leading to orientation‐dependent lattice misfitting status with γ ‐matrix. The deformation process of γ ′ phase is determined to be of APB (anti‐phase boundary)‐type shearing induced by gliding of paired {100}a/2<1 ¯ 10> superpartial dislocations, thus γ ′ phase plays a APB‐strengthening role in Inconel 718 alloy.