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Related Experiment Videos

Trans-interface diffusion-controlled coarsening.

Alan J Ardell1, Vidvuds Ozolins

  • 1Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, California 90095-1595, USA. aardell@ucla.edu

Nature Materials
|March 22, 2005
PubMed
Summary
This summary is machine-generated.

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A new model explains particle coarsening kinetics, predicting no volume fraction effect on diffusion-controlled processes. This challenges existing theories and aligns with Ni-Al alloy experimental data.

Area of Science:

  • Materials Science
  • Physical Chemistry
  • Condensed Matter Physics

Background:

  • Diffusion-controlled coarsening of polydisperse particles is crucial in materials science.
  • Predicting the volume-fraction dependence of coarsening kinetics has been theoretically challenging.

Purpose of the Study:

  • To present a novel model for diffusion-controlled coarsening.
  • To investigate the role of interface structure and diffusion bottlenecks.
  • To reconcile theoretical predictions with experimental observations in Ni-Al alloys.

Main Methods:

  • Development of a new coarsening model based on diffusive transport through a coherent, ragged interface.
  • Atomistic calculations to characterize interface structure.
  • Analysis of experimental data from Ni-Al alloys.

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Main Results:

  • The model predicts linear growth of the average radius squared with time.
  • Solute depletion is predicted to decrease with the inverse square-root of time.
  • No volume fraction effect on kinetics or scaled particle-size distributions is predicted for dispersed ordered phases.

Conclusions:

  • The new model provides a framework for understanding diffusion-controlled coarsening.
  • The model's predictions are consistent with experimental data for Ni-Al alloys, particularly regarding the absence of volume fraction effects under specific conditions.
  • This work highlights the importance of interface structure in governing coarsening dynamics.