Mg Segregation at $\mathrm{A}\mathrm{l}/{\mathrm{A}\mathrm{l}}_{3}\mathrm{S}\mathrm{c}$ Heterophase Interfaces on an Atomic Scale: Experiments and Computations

Mg Segregation at $A l / {A l}_{3} S c$ Heterophase Interfaces on an Atomic Scale: Experiments and Computations

E. A. Marquis, D. N. Seidman, M. Asta, C. Woodward, and V. Ozoliņš

Phys. Rev. Lett. 91, 036101 – Published 18 July 2003

Abstract

Microscopic factors governing solute partitioning in ternary two-phase Al-Sc-Mg alloys are investigated combining three-dimensional-atom-probe (3DAP) miscroscopy measurements with first-principles computations. 3DAP is employed to measure composition profiles with subnanometer-scale resolution, leading to the identification of a large enhancement of Mg solute at the coherent $α − A l / {A l}_{3} S c$ ( $f c c / {L 1}_{2}$ ) heterophase interface. First-principles calculations establish an equilibrium driving force for this interfacial segregation reflecting the nature of the interatomic interactions.

Received 8 March 2003

DOI:https://doi.org/10.1103/PhysRevLett.91.036101

Authors & Affiliations

E. A. Marquis^1,*, D. N. Seidman¹, M. Asta¹, C. Woodward^1,†, and V. Ozoliņš²

¹Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA
²Department of Materials Science and Engineering, University of California, Los Angeles, California 90095, USA

^*Present address: Sandia National Laboratories, Livermore, CA 94551, USA.
^†Permanent address: Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright Patterson AFB, OH 45433, USA.

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Vol. 91, Iss. 3 — 18 July 2003

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Physical Review Letters

Mg Segregation at Al/Al3Sc Heterophase Interfaces on an Atomic Scale: Experiments and Computations

E. A. Marquis, D. N. Seidman, M. Asta, C. Woodward, and V. Ozoliņš

Phys. Rev. Lett. 91, 036101 – Published 18 July 2003

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Mg Segregation at $A l / {A l}_{3} S c$ Heterophase Interfaces on an Atomic Scale: Experiments and Computations