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Herein, the effect of substitution of Ni with Ni 3 Al and two-step sintering on the phase transformation, microstructure evolution, and properties of W–6Ni–4Co alloys were evaluated. The results show that the reaction products of Ni 3 Al and Co include (Ni, Co) 3 Al 4  to Co 2 Al 9  during the two-step sintering process. When Ni was substituted by Ni 3 Al, the densification temperature was reduced. The distribution of W phase turned from stripes to network, and the grain size increased with an increase in the sintering temperature. The Ni 3 Al substituted sample sintered at 1500 °C for 20 min displayed a combination of high densification parameter, microhardness, and strength because of denser microstructure of the alloy.

Study on substitution of Ni with Ni3Al on structure and properties of W–6Ni3Al–4Co alloys by two-step sintering process

Study on substitution of Ni with Ni₃Al on structure and properties of W–6Ni₃Al–4Co alloys by two-step sintering process