The dynamic mechanical properties of the miscible Cu₅₀Zr₅₀ and immiscible Cu₅₀Ag₅₀ amorphous materials are investigated to explore the relationship between deformation mechanism and relaxation of glass through molecular dynamics simulation with modified embedded atom method (MEAM). It is found that the mechanical hysteresis of Cu₅₀Ag₅₀ glass is more pronounced than that of Cu₅₀Zr₅₀ glass. The storage modulus decreases with increasing loading period or amplitude; while the loss modulus increases till the maximum, corresponding to the beginning of $\alpha -$ relaxation. The $\mathrm{\beta }-$ relaxation in both Cu₅₀Zr₅₀ and Cu₅₀Ag₅₀ glass shows excess tails in the loss modulus curves. However, the peak height on the left part in the curve of loss modulus as a function of temperature for Cu₅₀Ag₅₀ glass is higher than that for Cu₅₀Zr₅₀ system, which indicates that $\mathrm{\beta }-$ relaxation in Cu₅₀Ag₅₀ glass is more likely to be activated than that in Cu₅₀Zr₅₀ system due to lower number of icosahedra-like clusters. The primary $\alpha -$ relaxation always takes place when the most probable atomic displacement reaches a critical fraction (～23%) for Cu₅₀Zr₅₀ and (～21%) for Cu₅₀Ag₅₀ of the average interatomic distance, irrespective of whether the relaxation is induced by temperature (linear response) or by mechanical strain (nonlinear). The fast atom is defined by the atom motion displacement to explore the dynamical heterogeneity of the glass. We find that the internal fraction shows linear with the number of fast atom.

通过改进的嵌入原子方法（MEAM），通过分子动力学模拟研究了可混溶的Cu ₅₀ Zr ₅₀和不可混溶的Cu ₅₀ Ag ₅₀非晶态材料的动态力学性能，以探讨玻璃的变形机理与弛豫之间的关系。发现Cu ₅₀ Ag ₅₀玻璃的机械磁滞比Cu ₅₀ Zr ₅₀玻璃的机械磁滞更明显。储能模量随着加载周期或振幅的增加而降低；而损耗模量增加到最大值，对应于$\alpha -$松弛。这$\mathrm{\beta }-$Cu ₅₀ Zr ₅₀和Cu ₅₀ Ag ₅₀玻璃的弛豫均显示出损耗模量曲线中的多余尾部。然而，Cu ₅₀ Ag ₅₀玻璃的损耗模量随温度变化的曲线左侧部分的峰高高于Cu ₅₀ Zr ₅₀体系的峰高，表明$\mathrm{\beta }-$Cu ₅₀ Ag ₅₀玻璃中的弛豫比Cu ₅₀ Zr ₅₀系统中的弛豫更有可能被激活，这是由于类似二十面体的团簇数量减少了。首要的$\alpha -$当最可能的原子位移达到平均原子间距的Cu ₅₀ Zr ₅₀的临界分数（〜23％）和Cu ₅₀ Ag ₅₀的（〜21 ％）的临界分数时，总是发生弛豫，而与温度是否引起弛豫无关（线性响应）或机械应变（非线性）。快速原子由原子运动位移定义，以探索玻璃的动力学异质性。我们发现内部分数与快原子数呈线性关系。