Atomistic mechanism of solid-state amorphization in the Ni-Zr system revealed by molecular dynamics simulation

摘要

＜正＞ Solid-state amorphization in the Ni-Zr system, which has a large negative heat of formation and a large atomte size difference, has been studied by molecular dynamics simulation. Simulation results demonstrated that atonue diffusion look place prior to amorphization in a temperature range from 250 to 600℃ . Quantitatively, amor-phization is governed by a diffusion-hmited reaction with an asymmetric growth exactly following t1/2 law. Besides, a low temperature limit allowing solid-state amorphization is found to be about 250℃ .