Abstract
The binder phase of NiFeCoCr medium entropy alloy (MEA) dispersed in W–Mo heavy tungsten alloy synthesized by secondary ball milling was studied. The results show that the MEA binder phase with a single FCC solid solution structure was obtained after the pre-milling process. A considerable reduction of Cr content in the MEA binder phase encourages the dissolution of Cr into the tungsten matrix and forms the Cr-rich oxides after the sintering process. TEM investigations show that the Cr-rich oxide has been indexed as the (Cr, Fe)O3 and the twinned structure was observed in the FCC MEA binder phase. Besides, as the sintering temperature was increased to 1450 °C, liquid phase sintering is dominant in the model alloys, leading to a decrease in the hardness of the model alloys.
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