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Fine-grained W-Ni-Mn-Y2O3 alloys were fabricated by mechanical alloying-assisted spark plasma sintering (SPS), and the effects of Y2O3 content on the microstructure and mechanical properties of the alloys were studied. Fine-grained 90W-6Ni-4Mn-Y2O3 alloys with uniform microstructure and excellent properties were prepared by SPS at 1150 °C. The addition of trace Y2O3 inhibited the sintering densification...