Abstract
The use of cemented tungsten carbide (WC) spans numerous commercial applications. Due to the extreme hardness and high modulus provided by the WC phase combined with added plasticity and resulting toughness contributed by the cobalt (Co) binder, cemented WC-Co is a good candidate for cutting tools, machining tools, and mining equipment. Co has been identified as a strategic and critical material from the Department of the Interior (DOI) and is “anticipated to be a human carcinogen” by the US Department of Health and Human Services (HHS). Nanostructured FeNiZr is being evaluated as a plausible binder replacement to Co since it doesn't exhibit these concerns. Preliminary consolidations of WC-FeNiZr powders utilizing Field Assisted Sintering followed by Hot Isostatic Pressing have generated (near) fully dense samples with hardness and toughness values exceeding 16 GPa (1630 HV) and 13 MPa-m1/2 (11.83 ksi-in1/2) respectively. Electron Backscatter Diffraction and Transmission Electron Microscopy are used to explain the structure-property relationship.
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