A new type of WC-Co-Ni-Al cemented carbide: Grain size and morphology of gamma '-strengthened composite binder phase

摘要

In contrast to the much larger grain size of the binder phase in traditional WC-Co cemented carbide, we have achieved a significantly reduced grain size of the gamma'-Ni3Al strengthened composite binder phase in WC-Co-Ni-Al cemented carbide. Based on thermodynamic calculations, decisive experiments and microstructure characterizations, the formation mechanism for grain size of binder phase in WC-Co-Ni-Al cemented carbide has been clarified, and the related boundary morphology and performance characteristics are discussed. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.