Special WC/Co orientation relationships at basal facets of WC grains in WC–Co alloys

In WC–Co alloys prepared by liquid phase sintering WC grains are partly surrounded by the Co binder and are terminated by basal and prismatic facets. This work reports transmission electron microscopy (TEM) observations on basal WC/Co interfaces. Two kinds of preferred orientation relationships are...

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Bibliographic Details
Published in:Journal of materials science 2008-02, Vol.43 (3), p.892-899
Main Authors: Bounhoure, Valérie, Lay, Sabine, Loubradou, Marc, Missiaen, Jean-Michel
Format: Article
Language:English
Subjects:
Alloys
Binders
Cemented carbides
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Cobalt
Cobalt base alloys
Cross-disciplinary physics: materials science
rheology
Crystallography and Scattering Methods
Exact sciences and technology
grain
Grains
Joining
Liquid phase sintering
Liquid phases
Materials Science
orientation
Orientation relationships
Other topics in materials science
Physics
Polymer Sciences
Preferred orientation
Solid Mechanics
Transmission electron microscopy
Tungsten carbide
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Summary:In WC–Co alloys prepared by liquid phase sintering WC grains are partly surrounded by the Co binder and are terminated by basal and prismatic facets. This work reports transmission electron microscopy (TEM) observations on basal WC/Co interfaces. Two kinds of preferred orientation relationships are found. The one most common corresponds to the joining of (0001)WC with (111)Cₒ planes. It leads to a large parametric misfit of 15% and is observed for only small pools of Co, mainly located in corners formed by the contact between WC grains. The second type of interface corresponds to the joining of (0001)WC with (001)Cₒ and is more rarely found. For random WC/Co orientation relationships a thin WC₁₋ₓ cubic layer about two atomic rows is revealed at the interface.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-007-2181-x