Simultaneous segregation at coherent and semicoherent heterophase interfaces

Aniruddha Biswas*, Donald J. Siegel, David N Seidman

*Corresponding author for this work

Research output: Contribution to journalArticle

55 Scopus citations

Abstract

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 θ′ 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.

Original languageEnglish (US)
Article number076102
JournalPhysical Review Letters
Volume105
Issue number7
DOIs
StatePublished - Aug 13 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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