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Plasticity and Creep in Single Crystals of Zirconium Carbide
Author(s) -
LEE D. W.,
HAGGERTY J. S.
Publication year - 1969
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1969.tb16067.x
Subject(s) - materials science , creep , transmission electron microscopy , burgers vector , dislocation , slip (aerodynamics) , crystallography , nimonic , zirconium , plasticity , climb , composite material , metallurgy , superalloy , microstructure , chemistry , thermodynamics , nanotechnology , physics
High‐temperature deformation in ZrC single crystals was studied. Seeded crystals were grown by a direct rf‐coupling floating‐zone process. Yield stresses were measured from 1080° to 2000°C as a function of stress axis orientation. The Burgers vector was shown to be parallel to the 〈110〉 axes by transmission electron microscopy. Slip was observed on {100}, {110}, or {111} planes, depending on the orientation of the stress axis; it always occurred on the most favorably oriented slip system. The dependence of steady‐state creep rate on the applied stress indicated that recovery occurred by a dislocation climb mechanism. Examination of the dislocation structure in deformed crystals by transmission electron microscopy supported this conclusion.