Correlation between supercooled liquid relaxation and glass Poisson's ratio.
Correlation between supercooled liquid relaxation and glass Poisson's ratio.
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DOI：
10.1063/1.4934228
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发表时间：
2015-10
期刊：
影响因子：
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通讯作者：
Qijing Sun;Lina Hu;Chao Zhou;Haijiao Zheng;Y. Yue
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文献类型：
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作者：
Qijing Sun;Lina Hu;Chao Zhou;Haijiao Zheng;Y. Yue
通过比较金属和非金属玻璃的α弛豫和慢β弛豫的活化能比r和泊松比v值，研究了过冷液体（SL）弛豫与玻璃泊松比v之间的关系。泊松比v通常随着比值r的增加而增加，并且该关系可以由经验函数v = 0.5 - A*exp（-B*r）来描述，其中A和B是常数。这种相关性可能意味着玻璃塑性与SL中α弛豫和慢β弛豫之间的竞争有关。这种相关性的物理基础在于从液体到玻璃的结构异质性的遗传。这项工作提供了深入了解玻璃变形的微观机制，通过SL动力学和复杂的结构演变过程中的液体玻璃转变。
We report on a correlation between the supercooled liquid (SL) relaxation and glass Poisson's ratio (v) by comparing the activation energy ratio (r) of the α and the slow β relaxations and the v values for both metallic and nonmetallic glasses. Poisson's ratio v generally increases with an increase in the ratio r and this relation can be described by the empirical function v = 0.5 - A*exp(-B*r), where A and B are constants. This correlation might imply that glass plasticity is associated with the competition between the α and the slow β relaxations in SLs. The underlying physics of this correlation lies in the heredity of the structural heterogeneity from liquid to glass. This work gives insights into both the microscopic mechanism of glass deformation through the SL dynamics and the complex structural evolution during liquid-glass transition.