Zr基块状非晶合金弛豫状态下的模量测定与有效原子作用势

Measurement of modulus and calculation of effective pair potential for Zr-based bulk amorphous alloy in structural relaxation

研究了Zr4 1Ti14 Cu12 .5Ni10 Be2 2 .5块状非晶合金的低温弛豫过程 ,测定了块状非晶合金的弹性模量E和热膨胀率α随温度的变化情况 ,利用 14 7型Lennard Jones势计算出该合金系统的原子平均最近距离r0 及平均有效原子作用势深度u0 在弛豫过程中的变化趋势。发现Zr基块状非晶合金的低温弛豫过程可分为两个阶段 :在低于 45 0K时 ,以化学短程有序化 (CSRO)为主 ;在高于 45 0K时 ,以拓扑短程有序化 (TSRO)为主。在前一个阶段中 ,u0 变化不大 ,r0 有所减小 ;在后一个阶段中 ,u0 和r0 均增大。

The measurements of the change of thermal expansion coefficient and the change of elastic modulus in the structural relaxation were performed for the metallic glass. The effective pair potential and the average next-neighbor distance were calculated according to the Lennard-Jones type potential. The results suggest that the structural relaxation can be divided into two subprocesses.