Research on the preparation and shielding properties of W-Ni-Fe alloy material by liquid phase sintering

摘要

Traditional and single shielding material has not satisfied the demand for radiation protection. Shielding materials with a good comprehensive performance have attracted attention. W-Ni-Fe alloys with different Ni/Fe ratios have been prepared through liquid phase sintering using W, Ni and Fe elementary powders. The microstructure, morphology and fracture appearance of such prepared W-Ni-Fe alloys with different Ni/Fe ratios were analysed with the SEM and metallographic test. The effects of the Ni/Fe ratio on the density, microhardness, tensile strength and shielding efficiency were investigated. The results show that for W-Ni-Fe alloys with different Ni/Fe ratios, the alloy surfaces are composed of ellipsoidal W particles on a NiFe substrate. However, when the Ni/Fe ratio is 7:3, uniform and spherical W crystals are embedded in the Ni-Fe substrate and evidently form dense boundaries, which contribute to the good mechanical properties and shielding effect of the alloy.