非晶态金属
幂律
材料科学
指数
弹性(物理)
弹性模量
无定形固体
流体静力平衡
变形(气象学)
线弹性
统计物理学
作者
Xuerui Wei,Bin Xu,Pengfei Guan
标识
DOI:10.1016/j.jnoncrysol.2021.121345
摘要
• Proposed a local elastic model for the inhomogeneous structural response in metallic glasses. • Revealed the linear relation between the local bulk modulus and the power-law exponent of local structural response. • Verified the relationship in model metallic glass by numerical simulations. The structural heterogeneity and mechanical inhomogeneity of metallic glasses at the nanoscale have been demonstrated by extensive experimental investigations, while their inherent correlation remains ambiguous. Based on elasticity theory, a model is developed to describe the local structural response of metallic glasses under hydrostatic deformation. We establish a linear relationship between the local bulk modulus and the nontrivial power-law exponent of the structural response and further verify this relationship by molecular dynamics simulations. The intrinsic link between the local structural response and elastic modulus reveals that the mechanical heterogeneity reflects not only the static atomic packing but also the dynamic evolution of the amorphous structure. Our findings provide direct evidence that mechanical heterogeneity is a feasible indicator for describing the structural heterogeneity of metallic glasses and shed some light on the non-cubic structural power law of disordered materials.
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