EVIDENCE OF DIFFUSION-CONTROLLED VITRIFICATION IN NI ZR BILAYER AT MEDIUM TEMPERATURES BY MOLECULAR-DYNAMICS SIMULATION/

On the basis of an n-body potential, a molecular-dynamics simulation f or a Ni/Zr bilayer with a preset disordered interfacial region was per formed to investigate the vitrification process upon isothermal anneal ing at medium temperatures. Mutual diffusion and alloying between Ni a nd Zr layers were observed, which in turn resulted in a diffusion-cont rolled vitrification initiating from the interface. Meanwhile, the dif fusivity of Ni was found to be greater than that of Zr in the amorphou s interlayer through a brief estimation of their diffusion coefficient s.