Microstructure and composition of the grain/binder interface in WC–Ni3Al composites
Source abstract
Abstract
Abstract The microstructure and composition of WC/Ni 3 Al interface were studied. An orientation relationship of [100] WC //[110] Ni3Al and (001) WC //(001) Ni3Al with a good coherence, besides many random orientation relationships between WC and Ni 3 Al, has been repetitively found by selected area electron diffraction and high resolution TEM observations. The XRD pattern of WC–Ni 3 Al composites indicated that the major binder phase was Ni 3 Al and showed possibility of coherence between WC and Ni 3 Al as common interplanar spacings existed. Electron probe microanalysis results revealed that the atomic ratio of Al:Ni is close to 1:3 in binder phase and WC/Ni 3 Al interface in the WC–Ni 3 Al composites has a sharper compositional gradient and a smaller width of transition region than the WC/Co interface in WC–Co composites.
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