Fine-grained W-Ni-Mn-YOalloys were fabricated by mechanical alloying-assisted spark plasma sintering(SPS), and the effects of YOcontent on the microstructure and mechanical properties of the alloys were studied. Fine-...Fine-grained W-Ni-Mn-YOalloys were fabricated by mechanical alloying-assisted spark plasma sintering(SPS), and the effects of YOcontent on the microstructure and mechanical properties of the alloys were studied. Fine-grained 90 W-6 Ni-4 Mn-YOalloys with uniform microstructure and excellent properties were prepared by SPS at 1150 ℃. The addition of trace YOinhibited 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 YOcontent. The optimum comprehensive mechanical properties(Rockwell hardness and bending strength) of the alloys were obtained at the same time when the mass fraction of YOwas 0.4%.展开更多
基金Project supported by the National Natural Science Foundation of China(51464010,51461014)the Natural Science Foundation of Hainan Province(20165207)
文摘Fine-grained W-Ni-Mn-YOalloys were fabricated by mechanical alloying-assisted spark plasma sintering(SPS), and the effects of YOcontent on the microstructure and mechanical properties of the alloys were studied. Fine-grained 90 W-6 Ni-4 Mn-YOalloys with uniform microstructure and excellent properties were prepared by SPS at 1150 ℃. The addition of trace YOinhibited 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 YOcontent. The optimum comprehensive mechanical properties(Rockwell hardness and bending strength) of the alloys were obtained at the same time when the mass fraction of YOwas 0.4%.
