Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 815, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.141273
Keywords
WC-Ni3Al-based composites; In situ preparation; Reactive microwave sintering; Mechanical properties; Toughening mechanisms
Categories
Funding
- National Natural Science Foundation of China [51861026]
- Natural Science Foundation of Jiangxi Province [20202BAB204013]
- Science Fund project of Jiangxi Education Department [GJJ160688, GJJ19052]
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WC-Ni3Al-based composites doped with VC and Al2O3 were prepared and characterized for their microstructure and mechanical properties. Composites with optimal microstructures exhibited excellent comprehensive mechanical properties, including high bending strength, Vickers hardness, and fracture toughness. The enhanced mechanical properties were attributed to reduced porosity and uniform refinement of WC grains in the cemented carbides.
WC-Ni3Al-based composites are promising candidates for use in titanium alloy processing. However, poor dispersion of the bonding and reinforcing phases in the conventionally prepared WC matrix negatively affects the comprehensive properties of WC-Ni3Al-based composites. Thus, novel VC and Al2O3 co-doped WC-10Ni3Al composites were prepared by in situ reactive microwave sintering; further, the microstructure and mechanical properties were characterized. The effects of in situ VC content on the microstructure and mechanical properties were investigated. The composites with optimal microstructures exhibited excellent comprehensive mechanical properties: bending strength of 2234.9 MPa, Vickers hardness of 1956 MPa, and fracture toughness of 22.6 MPa.m1/2. In addition, the friction coefficient of the prepared composites decreased gradually as the VC content increased to 0.75 wt%; as the VC content increased further, the friction coefficient increased gradually. The enhanced mechanical properties of the prepared composites may be attributed to the reduced porosity of the cement carbides and uniform refinement of the WC grains. The toughening mechanisms of the cemented carbides were also observed.
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