Dissociation of dislocations in MgAl2O4spinel deformed at low temperatures
作者:
P. Veyssié,
C.B. Carter,
期刊:
Philosophical Magazine Letters
(Taylor Available online 1988)
卷期:
Volume 57,
issue 4
页码: 211-220
ISSN:0950-0839
年代: 1988
DOI:10.1080/09500838808214710
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
When spinel is deformed in compression at 400°C along ⟨110⟩, the primary slip plane is found to be {111} with cross-slip occurring on a {001} plane. A comparison of weak-beam images of dislocations from both systems indicates that all dislocations which belong to the primary slip plane are dissociated out of the {111} plane independent of the character of the dislocation. It is proposed that deformation occurs by motion of dislocations in their dissociated state and that the partial dislocations actually glide on parallel glide planes. Movement of these dissociated dislocations is then accompanied by a concurrent migration of the stacking fault which takes place by a local shuffling of the cations. A stacking fault energy for conservative dissociation at 400°C on {001} of 530±90mJ m−2has been determined from weak-beam images of screw dislocations.
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