Trans-interface diffusion-controlled coarsening

ABSTRACT Accurate theoretical predictions of the volume-fraction dependence during diffusion-controlled coarsening of a polydisperse assembly of particles have proved difficult. Here, a new

model of coarsening is presented, involving diffusive transport through the coherent interface between ordered and disordered phases, which atomistic calculations show has a ragged

structure. The interface is a diffusion bottleneck when the ordered phase is dispersed. It is predicted that the square of the average radius grows linearly with time, that the depletion of

solute decreases as the inverse square-root of time, and that there is no effect of volume fraction on kinetics and the scaled particle-size distributions. These differ dramatically from

predictions of modern theories of diffusion-controlled coarsening. Data on coarsening in Ni-Al alloys is examined. We show that no other theory is consistent with the experimentally observed

absence of an effect of volume fraction on coarsening of ordered γ′ (Ni3Al) precipitates in a disordered Ni-Al (γ) matrix, and the strong volume-fraction dependence of coarsening of γ

precipitates in an ordered γ′ matrix. Access through your institution Buy or subscribe This is a preview of subscription content, access via your institution ACCESS OPTIONS Access through

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benefited from helpful discussions with Mark Asta. A.J.A. is grateful to the National Science Foundation for financial support of this research under Grant DMR-0209260. V.O. was supported by

the MARCO Focus Center for Functional Engineered Nano Architectonics (FENA) and by the National Science Foundation under Grant DMR-0427638. AUTHOR INFORMATION AUTHORS AND AFFILIATIONS *

Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, 90095-1595, California, USA Alan J. Ardell & Vidvuds Ozolins Authors * Alan J. Ardell

View author publications You can also search for this author inPubMed Google Scholar * Vidvuds Ozolins View author publications You can also search for this author inPubMed Google Scholar

CORRESPONDING AUTHORS Correspondence to Alan J. Ardell or Vidvuds Ozolins. ETHICS DECLARATIONS COMPETING INTERESTS The authors declare no competing financial interests. RIGHTS AND

PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Ardell, A., Ozolins, V. Trans-interface diffusion-controlled coarsening. _Nature Mater_ 4, 309–316 (2005).

https://doi.org/10.1038/nmat1340 Download citation * Received: 27 July 2004 * Accepted: 19 January 2005 * Published: 20 March 2005 * Issue Date: 01 April 2005 * DOI:

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