Experimental study and reassessment of the Ni-Hf binary system

Using the diffusion couple and electron probe microanalysis techniques, the phase boundaries of the solid phase of the Ni-Hf system have been determin ed at 1123 and 1173 K. The intermediate compound NiHf2 is found to have a l imited range of homogeneity. The Ni-Hf system is reassessed by means of the CALPHAD technique. A set of parameters consistent with most of the experim ental data on both phase diagram and thermodynamic properties is obtained. The crystallization temperature T-x and the glass forming range have been p redicted based on the obtained thermodynamic description, and the result is consistent with available experimental information.