ABSTRACT What determines the morphology of a decomposing alloy? Besides the well-established effect of the nucleation barrier, we demonstrate that, in a concentrated multicomponent Ni(Al,Cr)

alloy, the details of the diffusion mechanism strongly affect the kinetic pathway of precipitation. Our argument is based on the combined use of atomic-scale observations, using

three-dimensional atom-probe tomography (3D APT), lattice kinetic Monte Carlo simulations and the theory of diffusion. By an optimized choice of thermodynamic and kinetic parameters, we

first reproduce the 3D APT observations, in particular the early-stage transient occurrence of coagulated precipitates. We then modify the kinetic correlations among the atomic fluxes in the

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THERMODYNAMIC MODEL FOR LATTICE POINT DEFECT-MEDIATED SEMI-COHERENT PRECIPITATION IN ALLOYS Article Open access 23 March 2021 IN SITU SYNCHROTRON DIFFRACTION AND MODELING OF NON-EQUILIBRIUM

SOLIDIFICATION OF A MNFECONICU ALLOY Article Open access 15 March 2021 REVEALING THERMALLY-ACTIVATED NUCLEATION PATHWAYS OF DIFFUSIONLESS SOLID-TO-SOLID TRANSITION Article Open access 30

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National Science Foundation, Division of Materials Research, under contract DMR-0241928. C.K.S. received partial support from an NSF graduate research fellowship, a W. P. Murphy Fellowship

and a Northwestern University terminal year fellowship. K.E.Y. received partial support from a NASA graduate fellowship. T. F. Kelly, Imago Scientific Instruments, is kindly thanked for the

use of a LEAP tomograph before our acquisition of this instrument. The authors thank M. Asta, M. Athènes, P. Bellon, E. Clouet, M. Nastar and F. Soisson who interacted in many helpful

discussions and S. M. Foiles for his grand canonical Monte Carlo code. G.M. was partially supported by an Eshbach Visiting Scholar Award from the McCormick School of Engineering and Applied

Science at Northwestern University. AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA

Zugang Mao, Chantal K. Sudbrack, Kevin E. Yoon, Georges Martin & David N. Seidman * Commissariat à l’Énergie Atomique, Cabinet du Haut Commissaire, Bâtiment Siège, 91191 Gif sur Yvette

Cedex, France Georges Martin * Northwestern University Centre for Atom-Probe Tomography, Northwestern University, Cook Hall, 2220 Campus Drive, Evanston, Illinois 60208, USA David N. Seidman

Authors * Zugang Mao View author publications You can also search for this author inPubMed Google Scholar * Chantal K. Sudbrack View author publications You can also search for this author

inPubMed Google Scholar * Kevin E. Yoon View author publications You can also search for this author inPubMed Google Scholar * Georges Martin View author publications You can also search for

this author inPubMed Google Scholar * David N. Seidman View author publications You can also search for this author inPubMed Google Scholar CONTRIBUTIONS Z.M. carried out the LKMC

simulation; C.K.S. and K.E.Y. carried out the 3D APT experiments; D.N.S. supervised and mentored Z.M., C.K.S. and K.E.Y.; G.M. analysed the observations in terms of diffusion theory.

CORRESPONDING AUTHOR Correspondence to David N. Seidman. ETHICS DECLARATIONS COMPETING INTERESTS The authors declare no competing financial interests. SUPPLEMENTARY INFORMATION SUPPLEMENTARY

INFORMATION Supplementary figure S1 and table S1 (PDF 238 kb) RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Mao, Z., Sudbrack, C., Yoon, K. _et al._

The mechanism of morphogenesis in a phase-separating concentrated multicomponent alloy. _Nature Mater_ 6, 210–216 (2007). https://doi.org/10.1038/nmat1845 Download citation * Received: 26

July 2006 * Accepted: 21 December 2006 * Published: 25 February 2007 * Issue Date: March 2007 * DOI: https://doi.org/10.1038/nmat1845 SHARE THIS ARTICLE Anyone you share the following link

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