Simultaneous Segregation at Coherent and Semicoherent Heterophase Interfaces

被引：92

作者：

Biswas, Aniruddha ^{[1
]}

Siegel, Donald J. ^{[2
]}

Seidman, David N. ^{[1
]}

机构：

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

[2] Univ Michigan, Dept Mech Engn, Ann Arbor, MI 48109 USA

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 07期

关键词：

ATOM-PROBE TOMOGRAPHY; GRAIN-BOUNDARIES; ALLOYS; EVOLUTION; ENERGY;

D O I：

10.1103/PhysRevLett.105.076102

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

By employing a combination of three-dimensional atom-probe tomography and first-principles calculations, significant qualitative and quantitative differences in solute segregation at coherent and semicoherent interfaces bounding a single theta' precipitate in an Al-Cu-based alloy are found. Qualitatively, localized segregation is observed at the semicoherent interface, whereas delocalized behavior is present at the coherent facets. Quantitatively, segregation at the semicoherent interface is a factor of 2 greater than at the coherent interface, resulting in a decrease in interfacial energy that is more than 5 times greater than that observed at the coherent facet. These observations illustrate unambiguously the strong couplings among interface structure, chemical composition, and energetics.

引用

页数：4

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