Effect of hot isostatic pressing sintering temperature on the properties of Mo–Na alloys

Mo–Na alloys were prepared by the hot isostatic pressing (HIP) sintering. The effects of HIP sintering temperature on the microstructure, hardness, density, and Na mass fraction of the Mo–Na alloys were studied. The densification process of the Mo–Na alloys sintered by HIP was analyzed. The results show that, the microstructure of the Mo–Na alloys prepared by HIP sintering is ultrafine and uniform, the average grain size of the alloys is below 10 μm. With the increase of the HIP sintering temperature, the relative density and hardness increase and reach the maximum value at 1100 ℃, which is 99.58% and HRA 54.50, respectively. The liquid phase formation during HIP plays an important role in the densification of the Mo–Na alloys. The volatilization of the Na metals with the low melting point during the high temperature sintering is well avoided in the process of HIP, and the Na mass fraction is almost unchanged after sintering at 1100 ℃.