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Plastic deformation mechanisms in a new Ni‐base single crystal superalloy at room temperature
Author(s) -
ZHANG P.,
YUAN Y.,
GAO Z.,
LI B.,
YANG G.,
SONG X.
Publication year - 2017
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/jmi.12597
Subject(s) - shearing (physics) , materials science , superalloy , stacking , stacking fault , superlattice , deformation (meteorology) , transmission electron microscopy , dislocation , deformation mechanism , single crystal , crystallography , ultimate tensile strength , composite material , condensed matter physics , metallurgy , nanotechnology , alloy , microstructure , chemistry , optoelectronics , physics , organic chemistry
Summary The evolution of dislocation configurations in a new Ni‐base single crystal superalloy, M4706, during tensile deformation at room temperature is characterised by transmission electron microscopy. Experimental results show that contrary to previous reports, numerous isolated superlattice stacking faults and extended stacking faults are formed in the slightly deformed specimens with and without tertiary γ′ precipitates. Meanwhile, it is also found that as the plastic deformation proceeds, the dominant deformation mechanism changes from stacking fault shearing to antiphase boundary shearing. Finally, based on experimental observations, the reasons for the formation of these faults and the transition in the deformation mechanism are discussed.