Sessile dissociation in the stoichiometric spinel MgAl2O4
Year: 1979
Type: article
Abstract: Dislocations in spinel, MgO. nAl2O3, are dissociated out of their glide planes and precise determinations of the dissociation planes by stereographic analysis are reported. It is shown that for stoichiometric spinel (n = 1), the numerous, long and straight, edge dislocations left by a small strain on { 110 } glide planes, are dissociated in the { 110 } plane normal to the slip plane with a dissociation width of the order of 10 nm. For { 111 } glide, preferred orientations are edge, screw and 60°. Edge dislocations are also dissociated in the { 110 } plane normal to the { 111 } glide plane with a dissociation width of 7 nm approximately. These features, which are repeatedly observed, are a general trend in early stage of creep tests (slip) of stoichiometric spinel and they account for the observed preferred orientations. When all the dislocations are frozen in these orientations, further deformation has to proceed by pure climb.
Source: Journal de physique
Authors: N. Doukhan, R. Duclos, B. Escaig
Institution: Université de Lille
Language: French
Subfield: Metals and Alloys
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2072497600