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Related Concept Videos

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Liquid–Solid Solutions

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The process of a solid dissolving in a liquid to form a solution is governed by the solubility limit, which is the maximum amount of the solid substance, or solute, that can be dissolved in a specific volume of the liquid or solvent. As the solute dissolves, it reaches a point where no more solute can be dissolved at a given temperature - this is known as the saturation point. However, if further solute is added and it manages to dissolve, the solution becomes supersaturated. Supersaturated...
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A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...
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Preparation and Reactivity of Gasless Nanostructured Energetic Materials
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Dynamic evolution process of multilayer core-shell microstructures within containerlessly solidifying Fe(50)Sn(50)

W L Wang1, Y H Wu1, L H Li1

  • 1MOE Key Laboratory of Space Applied Physics and Chemistry, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China.

Physical Review. E
|April 15, 2016
PubMed
Summary
This summary is machine-generated.

In microgravity, Fe(50)Sn(50) alloys formed multilayer core-shell structures during solidification. The two-layer core-shell structure is the most stable, driven by solutal Marangoni migration.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Physics

Background:

  • Multilayer core-shell structures commonly form in polymers and alloys under symmetrical conditions.
  • Understanding alloy solidification under extreme conditions is crucial for materials development.

Purpose of the Study:

  • To investigate the dominant microstructures in binary Fe(50)Sn(50) immiscible alloys solidified under microgravity.
  • To elucidate the phase separation process and stability of core-shell structures.

Main Methods:

  • Containerless solidification within a drop tube under microgravity conditions.
  • Three-dimensional phase field simulations to model liquid phase separation.
  • Analysis of microstructure evolution driven by solutal Marangoni migration.

Main Results:

  • Two- to five-layer core-shell microstructures were the dominant morphology in solidified Fe(50)Sn(50) alloy.
  • Uniformly dispersive structures and multilayer core-shells represent metastable states.
  • The two-layer core-shell structure was identified as the most stable microstructure with the lowest chemical potential.

Conclusions:

  • Microgravity and containerless processing promote unique core-shell morphologies in immiscible alloys.
  • Solutal Marangoni migration plays a significant role in microstructure evolution, especially when Stokes motion is suppressed.
  • The study identifies the most stable core-shell configuration for Fe(50)Sn(50) alloys, offering insights into alloy design.