Al2(Mg,Ca) phases in Mg-Al-Ca ternary system: First-principles prediction and experimental identification

Yu Zhong, Jing Liu, Ron A. Witt, Yong ho Sohn, Zi Kui Liu

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

First-principles calculations of three Laves phase structures at Al2Ca and Al2Mg compositions predict the existence of Al2(Mg,Ca) Laves phase. To validate this prediction, a diffusion couple between Mg-30 wt.%Ca alloy and pure Al was assembled and heat-treated at 688 K for 2 weeks. From the cross section of the diffusion couple, backscatter electron microscopy coupled with electron probe microanalysis indicated the existence of Al2(Mg,Ca). Two Laves phases, i.e. C36-Al2(Mg,Ca) and C14-Al2(Mg,Ca), were identified by indexing the electron backscatter diffraction pattern with predicted lattice parameters by first-principles calculations and by diffraction analysis using transmission electron microscopy independently.

Original languageEnglish (US)
Pages (from-to)573-576
Number of pages4
JournalScripta Materialia
Volume55
Issue number6
DOIs
StatePublished - Sep 1 2006

All Science Journal Classification (ASJC) codes

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

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