Simultaneous strengthening and toughening effects in WC-(nanoWC-Co)

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• 作者：Guan-Jun Yang^a ; Pei-Hu Gao^a ; ^b ; Cheng-Xin Li^a ; Chang-Jiu Li^a ; ^{licj@mail.xjtu.edu.cn}
• 关键词：Cermets ; Nanostructured WC&ndash ; Co matrix ; Hardness ; Toughness
• 刊名：Scripta Materialia
• 出版年：2012
• 期刊代码：157_13596462
• 类别：et
• 出版时间：May, 2012
• 卷：66
• 期：10
• 页码：777-780
• 文件大小：383 K

摘要

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 卤 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 卤 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.