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Relation between the Activation Parameters of the Plastic Deformation in MgO Crystals Determined by Macroscopic and by In‐situ HVEM Experiments
Author(s) -
Bartsch M.,
Messerschmidt U.,
Appel F.
Publication year - 1979
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19790141110
Subject(s) - materials science , deformation (meteorology) , dislocation , in situ , stress (linguistics) , strain rate , strain (injury) , volume (thermodynamics) , composite material , crystallography , mechanics , thermodynamics , chemistry , physics , anatomy , medicine , linguistics , philosophy , organic chemistry
The results of macroscopic strain rate and temperature cycling tests on MgO single crystals are compared with the results of in‐situ deformation tests in a HVEM on the basis of the basis of the thermally activated dislocation glide model. The activation volume estimated by strain rate cycling tests is compatible with the mean obstacle distance of the screw dislocations. However, the local stress estimated by in‐situ deformation tests was found to be larger than the macroscopic yield stress.