Study on Preparation of Mo–Ni alloy with spark plasma sintering

Mo-Ni alloy was prepared by spark plasma sintering. The effects of sintering temperature, pressure, holding time and heating rate on the relative density of Mo-Ni alloy were studied. The relative density, microstructure and phase of Mo-Ni alloy were characterized by SEM, XRD and EBSD. The densification process of Mo-Ni alloy sintered by spark plasma was analyzed.The results show that, Sintering temperature and pressure are the main factors affecting the relative density of Mo-Ni alloy; The maximum relative density is 99.10%, and the average grain size is less than 10μm;The local high-speed diffusion of Mo and Ni is the main reason for promoting the densification of Mo-Ni alloy;The phase of sintered Mo-Ni alloy is mainly composed of Mo and Mo-Ni mesophase,and Mo particles are evenly distributed in the network structure formed by Mo-Ni mesophase;The average rockwell hardness value is 72.The content of additive Ni% does not change much before and after sintering.