沉积玻璃成型器中超稳定的结构特征
Fabio Leoni1, Fausto Martelli2, C Patrick Royall3,4,5,6
1Dipartimento di Fisica, Università degli Studi di Roma La Sapienza, Piazzale Aldo Moro 5, Rome 00185, Italy.
Physical review letters
|May 27, 2023
概括
蒸汽沉积玻璃由于局部偏好的结构 (LFS) 显示了增强的稳定性. 这些结构在特定温度下形成最佳,并受到表面松动态的影响,改善玻璃的稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 计算化学的计算化学
背景情况:
- 与传统玻璃相比,在冷基板上通过蒸汽沉积形成的玻璃显示出增强的热力学和运动稳定性.
- 了解这种增加稳定的微观起源对于设计先进的玻璃材料至关重要.
研究的目的:
- 用分子动力学模拟来研究蒸气沉积玻璃中优越稳定的起源.
- 为了确定与这些玻璃的增强稳定性相关的结构特征.
主要方法:
- 用分子动力学模拟来建模一个模型玻璃制造器的蒸汽沉积过程.
- 分析重点是识别和量化局部优势结构 (LFS) 以及它们与玻璃稳定性的相关性.
主要成果:
- 蒸汽沉积玻璃的特点是存在局部偏好的结构 (LFS).
- 液压玻璃的出现与沉积玻璃的增强稳定性直接相关.
- 在最佳沉积温度下,LFS形成达到顶峰,并且在自由表面附近得到增强.
结论:
- 蒸汽沉积玻璃的增强稳定性归因于局部受益结构 (LFS) 的形成.
- 表面放松动态在LFSs的形成和蒸气沉积玻璃的整体稳定性中起着重要作用.
相关概念视频
Stress-Strain Diagram - Brittle Materials
2.7K
Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
2.7K
Plastic Behavior
232
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
232


