Solid-state amorphization of Ni/Zr bilayer through diffusion-limited-reaction observed by molecular-dynamics simulation

摘要

Amorphization in the Ni/Zr bilayer upon isothermal annealing is observed by a molecular-dynamics simulation using a n-body potential. The disordering process is found to initiate and extend from a preset disordered interfacial layer through atomic diffusion and alloying between Ni and Zr layers. Furthermore, it is clearly evidenced by our simulation that the growing process of amorphous phase follows a t exp 1/2 time dependence kinetics, featuring a typical diffusion-limited growth with asymmetric speeds in two opposite directions. All these results suggest that the observed amorphization is, in fact, a result of diffusion-limited-reaction.