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Fine-grained W-Ni-Mn-Y_2 O_3 alloys were fabricated by mechanical alloying-assisted spark plasma sintering(SPS), and the effects of Y_2 O_3 content on the microstructure and mechanical properties of the alloys were studied. Fine-grained 90 W-6 Ni-4 Mn-Y_2 O_3 alloys with uniform microstructure and excellent properties were prepared by SPS at 1150 ℃. The addition of trace Y_2 O_3 inhibited the sintering densification process and refined the W grain size. The average W grain size decreased from 5.5 μm to 2.1 μm.The fracture mode changed from W grain transgranular fracture and W-W interface fracture to W-W and W-Matrix phase interface fracture. The Rockwell hardness and bending strength of alloys initially increased and then decreased with increasing Y_2 O_3 content. The optimum comprehensive mechanical properties(Rockwell hardness and bending strength) of the alloys were obtained at the same time when the mass fraction of Y_2 O_3 was 0.4%.
Fine-grained W-Ni-Mn-Y 2 O 3 alloys were fabricated by mechanical alloying-assisted spark plasma sintering (SPS), and the effects of Y_2 O_3 content on the microstructure and mechanical properties of the alloys were studied. Fine-grained 90 W -6 Ni-4 Mn-Y 2 O 3 alloys with uniform microstructure and excellent properties were prepared by SPS at 1150 ° C. The addition of trace Y_2 O_3 inhibited the sintering process and refined the W grain size. The average W grain size decreased from 5.5 μm to 2.1 μm. The fracture mode changed from W grain transgranular fracture and WW interface fracture to WW and W-Matrix phase interface fracture. The Rockwell hardness and bending strength of alloys initially increased and then decreased with increasing Y_2 O_3 content. The optimum comprehensive mechanical properties (Rockwell hardness and bending strength) of the alloys were obtained at the same time when the mass fraction of Y_2 O_3 was 0.4%.