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High Temperature Deformation Mechanisms in WC-Ni 3Al Cermets

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Document pages: 43 pages

Abstract: The microstructure and mechanical properties of WC-Ni3 composites were examined after compression in the temperature range of 650-900 ℃. At these temperatures, antiphase boundaries were generated in the Ni3Al binder phase. Due to this mechanism, the WC-10 Ni3Al sample exhibits high compressive strengths of ~1300-1650 MPa at elevated temperatures. TEM analysis indicates that plastic accommodation during the deformation process is primarily due to deformation of both the WC and the Ni3Al binder. Yield loci slip mode analysis was used to confirm that dislocations, stacking faults, and even twins can exist on the prismatic plane {01‾10} in WC at high temperatures. This type of combined strengthening from both the matrix and binder provides a new strategy to improve the high-temperature mechanical properties of cemented carbides. Moreover, Ni3Al becomes a promising alternative intermetallic to Co as a binder.

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