Microstructure and sliding-wear behavior of tungsten-reinforced W-Ni-Si metal-silicide <Emphasis Type="Italic">in-situ</Emphasis> composites |
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Authors: | H M Wang D Y Luan L X Cai |
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Affiliation: | (1) the Laboratory of Laser Materials Processing and Surface Engineering, School of Materials Science and Engineering, Beihang University (formerly Beijing University of Aeronautics & Astronautics), 100083 Beijing, P.R. China |
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Abstract: | W-Ni-Si metal-silicide-matrix in-situ composites reinforced by tungsten primary grains were fabricated using a water-cooled copper-mold laser-melting furnace by
the LASMELT process. Main constitutional phases of the W/W-Ni-Si in-situ composites are the tungsten primary phase, peritectic W2Ni3Si, and the remaining W2Ni3Si/Ni31Si12 eutectics, depending on the alloy compositions. The sliding-wear resistance of the W/W-Ni-Si intermetallic composites was
evaluated at room temperature and 600 °C. Wear mechanisms of the W/W2Ni3Si in-situ composites were discussed based on morphology observations of the worn surface and wear debris. Results show that the W/W-Ni-Si
composites have excellent wear resistance under both room- and high-temperature sliding-wear-test conditions, because of the
high yield strength and toughness of the tungsten-reinforcing phase and the high hardness and the covalent-dominated intermetallic
atomic bonds of the W2Ni3Si and Ni31Si12 metal silicides. Tungsten-reinforcing grains played the dominant role in resisting abrasive-wear attacks of microcutting,
plowing, and brittle spalling during the sliding-wear process, while the W2Ni3Si and Ni31Si12 metal silicides are responsible for the excellent adhesive wear resistance. |
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