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The Hardness and Strength Properties of WC-Co Composites
Center for Energetic Concepts Development, Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
Received: 8 June 2011; in revised form: 4 July 2011 / Accepted: 6 July 2011 / Published: 14 July 2011
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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Armstrong, R.W. The Hardness and Strength Properties of WC-Co Composites. Materials 2011, 4, 1287-1308.
Armstrong RW. The Hardness and Strength Properties of WC-Co Composites. Materials. 2011; 4(7):1287-1308.
Armstrong, Ronald W. 2011. "The Hardness and Strength Properties of WC-Co Composites." Materials 4, no. 7: 1287-1308.