The effect of structural relaxation on electrical resistivity, ρ_glass, of strain-free Zr_46.75Ti_8.25Cu_7.5Ni₁₀Be_27.5 bulk metallic glass was studied during isothermal aging at several temperatures, T_as. Since cooling of a liquid metal increases its resistivity ρ_liq, one expects ρ_glass to increase on aging toward ρ_liq at T = T_a. Instead, ρ_glass decreased non-exponentially with the aging time. The activation energy of aging kinetics is 189 kJ mol⁻¹, which is higher than the activation energy of the Johari-Goldstein (JG) relaxation. After considering the sample’s contraction, phase separation, and crystallization as possible causes of the decrease in ρ_glass, we attribute the decrease to depletion of islands of atomic mobility, soft spots, or static heterogeneity. Vibrations of the atoms in these local (loosely packed) regions and in the region’s interfacial area contribute to electron scattering. As these deplete on aging, the contribution decreases and ρ_glass decreases, with a concomitant decrease in macroscopic volume, enthalpy, and entropy (V, H, and S). Local regions of faster mobility also decrease on cooling as V, H, and S of a liquid decrease, but structure fluctuations dominate electron scattering of a liquid metal and ρ_liq increases effectively according to the Ziman-Nagel theory for a homogenously disordered structure. Whether depletion of such local regions initiates the structural relaxation of a glass, or vice versa, may be resolved by finding a glass that physically ages but shows no JG relaxation.

中文翻译：

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在大块金属玻璃老化过程中，随着迁移率岛的耗尽，电阻率降低

研究了结构松弛对无应变Zr _46.75 Ti _8.25 Cu _7.5 Ni ₁₀ Be _27.5大块金属玻璃的电阻率ρ_玻璃的影响，该温度在多个温度T _a s下等温时效期间。由于液体金属的冷却增加了其电阻率ρ _LIQ，人们期望ρ_玻璃，以增加在朝向老化ρ _LIQ在Ť = Ť_一个。取而代之的是ρ_玻璃下降 与老化时间成指数增长。老化动力学的活化能为189 kJ mol ^-1，高于Johari-Goldstein（JG）弛豫的活化能。在考虑了样品的收缩，相分离和结晶是ρ_玻璃降低的可能原因之后，我们将这种降低归因于原子迁移岛，软点或静态异质性的耗尽。这些局部（松散堆积）的区域和该区域的界面区域中原子的振动会导致电子散射。随着这些物质的消耗，老化作用减小，ρ_玻璃减小，宏观体积，焓和熵也随之减小（V，H和S）。更快的移动性的局部区域也减少对冷却为V，ħ，和小号的液体减少，但液态金属和的结构波动支配电子散射ρ _LIQ增加有效根据子蔓-Nagel的理论为一个均匀无序结构。这些局部区域的耗尽是引发玻璃的结构弛豫还是反之，可以通过找到物理上老化但没有显示出JG弛豫的玻璃来解决。