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Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
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Interaction between droplet and advancing solidification interface during solidification of immiscible alloys
Jiuzhou Zhao1, Binghao Han1, Linjie Yang1
1Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China.
Advances in Colloid and Interface Science
|October 1, 2025
Summary
This study models solidification interface interactions with minority phase droplets in immiscible alloys. It reveals Marangoni migration hinders droplet capture, while increased droplet viscosity facilitates it, impacting composite microstructure.
Area of Science:
- Materials Science
- Metallurgy
- Phase Transformations
Background:
- Liquid-liquid phase transformation during alloy solidification creates in-situ composites.
- Minority phase droplet repulsion by solidification interfaces can lead to undesirable microstructures like grain boundary enrichment or macro-segregation.
- Existing models for particle-solidification interface interactions are insufficient for fluid droplets.
Purpose of the Study:
- To develop and verify a model for the interaction between an advancing solidification interface and nearby fluid droplets.
- To investigate factors influencing droplet capture by the solidification interface.
- To differentiate droplet behavior from particle behavior near solidification interfaces.
Main Methods:
- Development of a new model for solidification interface-droplet interactions.
- Verification of the model against experimental results.
- Numerical analysis of factors affecting droplet capture.
Main Results:
- Marangoni migration of droplets significantly hinders their capture by the solidification interface compared to solid particles.
- Increased relative viscosity of the droplet to the matrix melt enhances droplet capture.
- For highly viscous droplets, Marangoni migration is negligible, and their capture resembles that of solid particles.
Conclusions:
- The developed model accurately describes solidification interface-droplet interactions.
- Droplet fluidity and Marangoni effect are critical factors in determining microstructure formation during alloy solidification.
- Understanding these interactions is key to controlling the development of high-performance in-situ particulate composites.
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