Mg segregation at Al/Al3Sc heterophase interfaces on an atomic scale:: Experiments and computations -: art. no. 036101

被引：97

作者：

Marquis, EA

Seidman, DN

Asta, M

Woodward, C

Ozolins, V

机构：

[1] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA

[2] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

[3] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.91.036101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 alpha-Al/Al3Sc (fcc/L1(2)) heterophase interface. First-principles calculations establish an equilibrium driving force for this interfacial segregation reflecting the nature of the interatomic interactions.

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