Journal
APPLIED SURFACE SCIENCE
Volume 254, Issue 13, Pages 3971-3978Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2007.12.028
Keywords
direct metal laser sintering (DMLS); nanocomposites; metal-matrix composites (MMCs); WC-Co; nanoindentation
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In the present work, the direct metal laser sintering (DMLS) process was used to prepare the WC-Co/Cu nanocomposites in bulk form. The WC reinforcing nanoparticles were added in the form of WC-10 wt.% Co composite powder. The microstructural features and mechanical properties of the laser-sintered sample were characterized by X-ray diffraction (XRD), atomic force microscope (AFM), scanning electron microscope (SEM), energy dispersive X-ray spectroscope (EDX), and nanoindentation tester. It showed that the original nanometric nature of the WC reinforcing particulates was well retained without appreciable grain growth after laser processing. A homogeneous distribution of the WC reinforcing nanoparticles with a coherent particulate/ matrix interfacial bonding was obtained in the laser-sintered structure. The 94.3% dense nanocomposites have a dynamic nanohardness of 3.47 GPa and a reduced elastic modulus of 613.42 GPa. (C) 2007 Elsevier B.V. All rights reserved.
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