过冷
非晶态金属
材料科学
放松(心理学)
玻璃化转变
二十面体对称
可塑性
阿累尼乌斯方程
分子动力学
凝聚态物理
活化能
化学物理
热力学
复合材料
物理
合金
物理化学
结晶学
量子力学
心理学
社会心理学
化学
聚合物
作者
Yongqiang Cheng,H. W. Sheng,E. Ma
标识
DOI:10.1103/physrevb.78.014207
摘要
Using Cu-Zr models, we demonstrate icosahedral ordering as a microscopic origin of the non-Arrhenius dynamical slowing down in metallic supercooled liquids. This correlation between the structural and dynamical heterogeneities underlies the evolution of the energy barrier for relaxation upon undercooling, as well as the eventual glass transition that leads to the formation of bulk metallic glasses (MGs). Our analysis of the energy barrier to plastic relaxation in MGs relates their macroscopic strength and plasticity to the local structures developed in the MGs. The structure-dynamics perspective explains not only the composition-dependent mechanical properties but also the known correlation between the strength of MGs and the glass transition temperature.
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