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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Grain Boundary Premelting in Colloidal Polycrystals.

Wei Li1, Zhibin Xu1, Tim Still2

  • 1Hong Kong University of Science and Technology, Department of Physics, Clear Water Bay, Hong Kong, China.

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|April 3, 2026
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This summary is machine-generated.

Grain boundary premelting, forming liquid layers below the melting point, is now better understood. This study reveals how liquid layers thicken and how grain boundary misorientation influences premelting behavior in materials.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Colloid Science

Background:

  • Grain boundary (GB) premelting, the formation of liquid layers along GBs below the melting point, significantly alters material properties.
  • This phenomenon is poorly understood due to observational challenges.

Purpose of the Study:

  • To investigate the mechanisms and characteristics of GB premelting.
  • To understand the influence of GB misorientation on premelting behavior.

Main Methods:

  • Experiments using temperature-sensitive microgel colloids.
  • Simulations of hard spheres to model GB premelting.
  • Comparison with a theoretical model for premelting volume fractions.

Main Results:

  • Observed logarithmic thickening of the premelted liquid layer.
  • Demonstrated that premelting onset and ending volume fractions depend on GB misorientation.
  • Found mutual influence between premelting GBs for finite grain sizes.

Conclusions:

  • GB premelting behavior is linked to GB misorientation and crystal melting/freezing points.
  • Findings advance the understanding of premelting phenomena.
  • Results are applicable to predicting liquid distribution in polycrystals for improved mechanical stability and materials processing.