Influence of structural relaxation on atomic mobility in a Zr_41.2Ti_13.8Cu₁₂₅Ni_10.0Be_22.5 (Vit1) bulk metallic glass

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• 作者：J.M. Pelletier
• 关键词：Amorphous metals ; metallic glasses ; Alloys ; Glass transition ; Mechanical properties ; Mechanical ; stress relaxation ; Microstructure ; Defects ; Structure ; Short-range order ; Viscosity and relaxation ; Structural relaxation ; Viscoelasticity
• 刊名：Journal of Non-Crystalline Solids
• 出版年：2008
• 期刊代码：50_00223093
• 类别：ms
• 出版时间：1 August 2008
• 卷：354
• 期：31
• 页码：3666-3670
• 文件大小：295 K

摘要

The effect of an annealing at a temperature above or below the glass transition temperature in a Zr_41.2Ti_13.8Cu₁₂₅Ni_10.0Be_22.5 bulk metallic glass was investigated using dynamic mechanical analysis. Structural relaxation influences both the storage modulus (elastic component) and the loss modulus (viscoelastic component). Kinetics can be captured by a stretched exponential relaxation function. Experimental results are correctly described using a physical model based on the concept of defects for the mechanical response of amorphous materials and especially for the characteristic time relative to atomic mobility.