用于移动固体-液体接口的毛细体波动方法:纯中接口属性的温度依赖性
Kaisei Urashima1, Yasushi Shibuta2, Munekazu Ohno3
1Graduate School of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan.
The Journal of chemical physics
|February 23, 2026
概括
研究人员使用分子动力学量化了低冷中的固体-液体界面自由能量和异构性. 毛细管波动方法成功跟踪移动的接口,揭示了对于预测材料微观结构至关重要的温度依赖趋势.
科学领域:
- 材料科学与工程 材料科学与工程
- 物理化学 物理化学
- 计算材料科学科学 计算材料科学
背景情况:
- 准确预测金属中的微结构演变需要理解低冷条件下的固体-液体界面热力学.
- 关于界面自由能量温度依赖性和异构性的定量数据仍然有限,阻碍了预测能力.
研究的目的:
- 扩展毛细管波动法 (CFM) 用于分析固化过程中移动的固体-液体接口.
- 确定纯 (Al) 的平均界面自由能量 (γ0) 和异性强度 (ε1, ε2) 的温度依赖.
- 评估CFM在非平衡固化条件下的适用性.
主要方法:
- 采用分子动力学模拟来建模低冷纯的固化.
- 在稳定状态迁移过程中跟踪即时的固体液体接口位置.
- 使用扩展毛细血管波动方法 (CFM) 分析了接口高度波动光谱.
主要成果:
- CFM成功分析了移动接口,显示了波动光谱中特有的k-2依赖性,证实了在非平衡条件下的适用性.
- 平均界面自由能量 (γ0) 随着点附近的温度下降而增加.
- 异性变量参数显示温度依赖性较弱: ε1 保持不变,而 ε2 随着低温增加而减少,表明 ε1 在高低温下主导异性变量.
结论:
- 毛细管波动法是一种可行的技术,用于量化低冷系统中移动接口的接口热力学.
- 界面自由能量和异构的确定的温度依赖性为计算材料科学提供了关键数据.
- 研究结果提供了对不同低冷却级别的界面异构性控制因素的见解.
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