Interfacial stability of θ′/Al in Al-Cu alloys

Kyoungdoc Kim, Bi Cheng Zhou, C. Wolverton*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

Designing low-energy interface structures is crucial in growth and coarsening studies of Al2Cu (θ′) precipitates. Given new experimental insights into the θ′/Al system, we use Density Functional Theory (DFT) calculations to investigate the energetics of the coherent (001)θ′//(001)Al and semi-coherent (010)θ′//(010)Al interfaces. We find that the recently proposed occupancy of interstitial Cu atoms at the coherent interface by Bourgeois et al. increases interfacial energy, and hence, is likely due to kinetic effects. For the semi-coherent interface, the semi-coherent interfacial energy does not significantly depend on interfacial configurations or misfit strains up to 10-unit cells of Al.

Original languageEnglish (US)
Pages (from-to)99-103
Number of pages5
JournalScripta Materialia
Volume159
DOIs
StatePublished - Jan 15 2019

Keywords

  • Al-Cu
  • Aluminum alloys
  • First-principles calculation
  • Interfacial energy
  • θ′ precipitate

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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