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Study on Strain Rate–Dependent Deformation Mechanism of WC–10 wt% Ni 3 Al Cemented Carbide by Micropillar Compression
Author(s) -
Zhang Minai,
Wang Xin,
Dupuy Alexander D.,
Schoenung Julie M.,
Li Xiaoqiang
Publication year - 2020
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.201900953
Subject(s) - materials science , strain rate , deformation mechanism , deformation (meteorology) , strain (injury) , dislocation , composite material , compression (physics) , metallurgy , grain boundary sliding , carbide , grain boundary , microstructure , medicine
Herein, the strain rate–dependent deformation mechanism of WC–10 wt% Ni 3 Al cermet micropillars is studied by in situ uniaxial compression. The results show that compression at high strain rates exhibits a relatively smooth stress–strain response compared with that at low strain rates. Microstructural characterization suggests that at high strain rates, grain boundary sliding is the dominant mechanism of deformation, whereas at low strain rates, dislocation annihilation plays the dominant role. The strain rate sensitivity index also varies with the strain rate from 1 × 10 −2 to 5 × 10 −3 s −1 , confirming that the dominant deformation mechanisms change in this range.