Journal
SCRIPTA MATERIALIA
Volume 66, Issue 10, Pages 777-780Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2012.02.005
Keywords
Cermets; Nanostructured WC-Co matrix; Hardness; Toughness
Categories
Funding
- National Natural Science Foundation of China [50725101, 50571080]
- Program for New Century Excellent Talents in University [NCET-08-0443]
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Simultaneous hardening and toughening effects were found for WC-(nanoWC-Co) with microWC strengthening particles in nanoWC-Co cermet matrix. The high microhardness of 1683 +/- 176 Hv comparable to that of nanoWC-12Co was attributed to the hardening effect from both microWC particles and nanoWC dispersion in the Co binder phase. The high fracture toughness of 18.9 +/- 4.0 MPa m(1/2), comparable to that of microstructured WC-12Co, resulted from the larger area of the bimodal-sized fracture surface morphology and the crack bridging due to the microsized strengthening WC particles. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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