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Article Dans Une Revue International Journal of Refractory Metals & Hard Materials Année : 2013

HRTEM investigation of dislocation interactions in WC

Résumé

The defect structure of the carbide phase in WC-Co alloys is studied by high resolution transmission electron microscopy. 1/3 < 1-213 > dislocations dissociated into 1/6 < 1-213 > partial dislocations in the {10-10} prismatic plane are studied and the atomic structure of the associated stacking fault is characterized. Another type of prismatic fault bounded by 1/2 < 10-11 > partial dislocations is also analysed. Interactions of extended dislocations are often observed and lead to the formation of dipoles when the dissociation occurs in parallel prismatic planes, or to 1/6 < 11-20 > stair-rod dislocations when the dissociation takes place in intersecting prismatic planes. The reaction of 1/6 < 1-213 > partial dislocations leads to sessile defects that are expected to limit the plasticity of the WC phase even at high temperature. (C) 2013 Published by Elsevier Ltd.

Domaines

Matériaux

Dates et versions

hal-00929790 , version 1 (13-01-2014)

Identifiants

Citer

S. Lay. HRTEM investigation of dislocation interactions in WC. International Journal of Refractory Metals & Hard Materials, 2013, 41, pp.416-421. ⟨10.1016/j.ijrmhm.2013.05.017⟩. ⟨hal-00929790⟩
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