液体Vit106a在微重力条件下的热物理特性和固化行为
Damien Terebenec1, Markus Mohr2,3, Rainer Wunderlich3,4
1Center for X-ray Analytics, Empa Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland. Damien.terebenec@empa.ch.
NPJ microgravity
|February 17, 2026
概括
研究人员使用国际空间站测量了液体Vit106a金属玻璃的热物理性能.
科学领域:
- 材料科学 材料科学 材料科学
- 热力学是一种热力学.
- 固态物理 固态物理
背景情况:
- 准确的热物理性能对于散装金属玻璃 (BMG) 玻璃化至关重要.
- 了解表面张力和粘度等取决于温度的特性是BMG处理的关键.
研究的目的:
- 使用微重力测量液体Vit106a的热物理性能.
- 分析表面张力和粘度的温度依赖性.
- 为了研究 Vit106a 在快速冷却下结晶的行为.
主要方法:
- 在国际空间站 (ISS) 上使用电磁悬浮器 (EML) 进行实验.
- 测量表面张力 (σ) 和粘度 (η),作为温度的函数.
- 进行X射线衍射 (XRD) 分析以确定样本结晶.
主要成果:
- 表面张力 (σ) 显示温度依赖性较弱: σ(T) = 1.557 - 4.36 × 10−5 × (T - 1106) N·m−1.1.
- 使用Vogel-Fulcher-Tammann (VFT) 方程进行粘度 (η) 分析,发现一个脆弱到强的过渡 (D* = 9.8高T,D* = 21.6低T).
- 尽管冷却在16 K·s−1,但样品完全结晶成二元金属间相,这与1.75 K·s−1.1的临界冷却速率相矛盾.
结论:
- 这项研究为Vit106a提供了重要的热物理数据,有助于大规模制造.
- 在快速冷却下观察到的结晶挑战了Vit106a在更厚的件中已知的形成玻璃的能力.
- 这些发现突显了BMG中热物理性质,冷却速度和玻璃形成之间的复杂相互作用.
相关概念视频
01:28Vapor Pressure of Fluid
2.0K
The vapor pressure of a fluid is a crucial concept in fluid mechanics, influencing phenomena such as boiling and cavitation. Vapor pressure refers to the pressure exerted by a vapor at a state of thermodynamic equilibrium with its corresponding liquid phase at a specific temperature. It represents the tendency of molecules to escape from the fluid surface into the vapor phase.
When a liquid is placed in a closed container with a small air space, and the space is evacuated, vapor molecules will...
When a liquid is placed in a closed container with a small air space, and the space is evacuated, vapor molecules will...
2.0K
02:57Surface Tension, Capillary Action, and Viscosity
33.7K
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
33.7K
02:19Physical Properties Affecting Solubility
27.5K
Solutions of Gases in Liquids
As for any solution, the solubility of a gas in a liquid is affected by the attractive intermolecular forces between solute and solvent species. Unlike solid and liquid solutes, however, there is no solute-solute intermolecular attraction to overcome when a gaseous solute dissolves in a liquid solvent since the atoms or molecules comprising a gas are far separated and experience negligible interactions. Consequently, solute-solvent interactions are the sole...
As for any solution, the solubility of a gas in a liquid is affected by the attractive intermolecular forces between solute and solvent species. Unlike solid and liquid solutes, however, there is no solute-solute intermolecular attraction to overcome when a gaseous solute dissolves in a liquid solvent since the atoms or molecules comprising a gas are far separated and experience negligible interactions. Consequently, solute-solvent interactions are the sole...
27.5K
02:39Phase Transitions: Melting and Freezing
15.3K
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
15.3K
01:19Viscosity of Fluid
1.3K
Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.
1.3K
01:19Specific Gravity of Aggregate
864
Aggregates typically contain pores, which can be either permeable or impermeable. Considering the pores in the aggregates, the specific gravity of aggregates is defined in three different forms, namely, bulk or gross specific gravity, apparent specific gravity, and absolute specific gravity.
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...
864