金属玻璃结构及其失稳的原子层次研究

管鹏飞, 孙胜君

Atomic-Level Study in the Structure and Its Instability of Metallic Glasses

GUAN Pengfei, SUN Shengjun

图2 基于“软度”定义的高热稳定和低热稳定度的非晶构型中“本征缺陷”的空间分布：非晶稳定性较高和非晶稳定性较低的构型快照，粒子半径表示用最低准局域模计算得到的振幅大小；及非晶稳定性不同的样品的振幅概率分布曲线，稳定性较高的体系中粒子大部分振幅较小，振动模式表现得更加局域化[41] (a, b) snapshots obtained for glassy samples with high stability (a) and poor stability (b). The particles are shown with their radius given by the “atomic softness” A(i) calculated from the lowest quasi-localized modes (c) the probability distribution of A(i) (P(Ai)) for glassy samples with high stability (a) and poor stability (b). For sample with high stability (a), there is a smaller fraction of the particles with larger A(i), and thus the modes are more localized (Tp—parent temperature)

Fig.2 Softness of quasi-localized modes and the probability distribution of vibrational amplitude (Ai) in poorly annealed glasses and the ultrastable glasses, respectively[41]