Materials 2011, 4(7), 1287-1308; doi:10.3390/ma4071287

The Hardness and Strength Properties of WC-Co Composites

Received: 8 June 2011; in revised form: 4 July 2011 / Accepted: 6 July 2011 / Published: 14 July 2011
(This article belongs to the Special Issue Hard Materials: Advances in Synthesis and Understanding)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: The industrially-important WC-Co composite materials provide a useful, albeit complicated materials system for understanding the combined influences on hardness and strength properties of the constituent WC particle strengths, the particle sizes, their contiguities, and of Co binder hardness and mean free paths, and in total, the volume fraction of constituents. A connection is made here between the composite material properties, especially including the material fracture toughness, and the several materials-type considerations of: (1) related hardness stress-strain behaviors; (2) dislocation (viscoplastic) thermal activation characterizations; (3) Hall-Petch type reciprocal square root of particle or grain size dependencies; and (4) indentation and conventional fracture mechanics results. Related behaviors of MgO and Al2O3 crystal and polycrystal materials are also described for the purpose of making comparisons.
Keywords: hardness; cracking; indentation fracture mechanics; dislocations; fracture stress; stress intensity; WC-Co composite; cemented carbide; WC; MgO; Al2O3; toughness; Hall-Petch relation; contiguity
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MDPI and ACS Style

Armstrong, R.W. The Hardness and Strength Properties of WC-Co Composites. Materials 2011, 4, 1287-1308.

AMA Style

Armstrong RW. The Hardness and Strength Properties of WC-Co Composites. Materials. 2011; 4(7):1287-1308.

Chicago/Turabian Style

Armstrong, Ronald W. 2011. "The Hardness and Strength Properties of WC-Co Composites." Materials 4, no. 7: 1287-1308.

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