Ab initio study of growth mechanism of omega precipitates in Al-Cu-Mg-Ag alloy and similar systems

Sung Jin Kang, Jian Min Zuo, Heung Nam Han, Miyoung Kim

Research output: Contribution to journalReview article

Abstract

We investigate nucleation and growth stages of Ω precipitates in Al-Cu-Mg-Ag alloys by using density functional theory calculations. Results show that the Ω-precipitates may initiate from two hexagonal Ag layers embedded inside the planes of the Al matrix with Mg at the center of the hexagons. A ledge structure model constructed from the interfacial atomic structure of the Ω precipitates suggests a mechanism whereby Cu atoms are delivered during ledge migration. The above mechanisms may be extended to similar interfacial structures found in other alloy systems, and can be exploited in designing new nano-precipitates.

Original languageEnglish (US)
Pages (from-to)207-212
Number of pages6
JournalJournal of Alloys and Compounds
Volume737
DOIs
StatePublished - Mar 15 2018

Keywords

  • Aluminum alloys
  • Density functional theory
  • Nucleation
  • Precipitate growth

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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