Energy landscape picture of overaging and rejuvenation in a sheared glass
Energy landscape picture of overaging and rejuvenation in a sheared glass
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DOI：
10.1103/physrevlett.93.255501
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发表时间：
2004-12-17
影响因子：
8.6
通讯作者：
Osborne, MJ
中科院分区：
文献类型：
--
作者：
Lacks, DJ;Osborne, MJ
用分子模拟和能谱分析研究了剪切对玻璃老化的影响。超过屈服点的剪切可以改变玻璃的状态，使其与老化过程中的不同阶段相似(但不完全相同)。大应变的循环通过将系统重新定位到较浅的能量最小值来使玻璃恢复活力，而小应变的循环通过将系统重新定位到更深的能量最小值来使玻璃超载。玻璃在过度老化和返老还童之间的平衡取决于玻璃最初的退火度。
Molecular simulations and an energy landscape analysis are used to investigate the effects of shear on aging in a glass. Shear beyond the yield point is shown to change the state of a glass such that it resembles (but is not identical to) a different stage in the aging process. A cycle of large strain rejuvenates the glass by relocating the system to shallower energy minima, while a cycle of small strain overages the glass by relocating the system to deeper energy minima. The balance between overaging and rejuvenation is controlled by how well the glass was initially annealed.