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When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
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Controlling solid-liquid interfacial energy anisotropy through the isotropic liquid.

Lei Wang1,2, Jeffrey J Hoyt3, Nan Wang4

  • 1Department of Materials Engineering, The University of British Columbia, 309-6350 Stores Road, Vancouver, BC, V6T 1Z4, Canada. lei.wang@mpie.de.

Nature Communications
|February 7, 2020
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Summary
This summary is machine-generated.

The solid-liquid interfacial free energy anisotropy influences alloy dendrite growth. This study confirms that adding Samarium to Aluminum changes dendrite orientation, providing insights into alloy solidification.

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Area of Science:

  • Materials Science
  • Solidification Science
  • Computational Materials Science

Background:

  • The anisotropy of solid-liquid interfacial free energy, though small, significantly impacts dendrite growth characteristics in alloys.
  • Previous research suggested that altering alloy composition could induce transitions in dendrite orientation.

Purpose of the Study:

  • To experimentally investigate the effect of Samarium (Sm) concentration on dendrite growth behavior in the Aluminum-Samarium (Al-Sm) system.
  • To elucidate the role of interfacial properties in observed changes in dendrite orientation using molecular dynamics simulations.

Main Methods:

  • Experimental examination of dendrite growth in the Al-Sm system across varying Sm solute concentrations.
  • Molecular dynamics simulations to study the interfacial properties and their relationship with solute concentration.
  • Analysis of crystallographic growth direction and interfacial free energy anisotropy.

Main Results:

  • Observed a transition in dendrite growth direction from [Formula: see text] to [Formula: see text] with increasing Sm content.
  • Simulation results showed a corresponding variation in interfacial free energy anisotropy with Sm concentration.
  • The experimental and simulation findings confirmed a previously proposed conjecture regarding dendrite orientation transitions.

Conclusions:

  • The study provides definitive experimental and computational evidence for concentration-dependent dendrite orientation transitions in binary alloys.
  • Results offer physical insights into the atomic origins of anisotropy variation at solid-liquid interfaces in Al-Sm alloys.
  • Deepens the fundamental understanding of interfacial phenomena governing alloy solidification.