Effects of substitutional impurity Au and Si atoms on antiphase boundary energies in Ti3Al: A first principles study

Yuichiro Koizumi, Masataka Mizuno, Atsushi Sugihara, Yoritoshi Minamino, Yasuharu Shirai

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Effects of substitutional impurity atoms Au and Si on the energies of antiphase boundaries (APBs) on {1100} and (0001) planes in a Ti3Al intermetallic compound were examined using first principles calculations. Au additions reduce the energies of APBs on both {1100} and (0001) planes by up to more than 40%. The reduction tends to be more remarkable especially when the added Au atom has larger number of Al atoms on its second-nearest neighbor sites rather than on first-nearest neighbor ones. In addition, in the case of Si addition, a significant energy reduction was found only for APBs on (0001) planes, and no remarkable dependence of APB energies on the coordinating atoms was found even for APBs on (0001) planes. These results are crucial to both understanding of the effect of APBs on the impurity diffusivity and predicting the ability of impurity atoms to stabilize antiphase domain structure that increases the strength of Ti3Al dramatically.

Original languageEnglish
Pages (from-to)3919-3934
Number of pages16
JournalPhilosophical Magazine
Volume90
Issue number29
DOIs
Publication statusPublished - 2010 Oct 14

Keywords

  • antiphase boundary
  • defect
  • first-principles calculation
  • impurity segregation
  • intermetallic compound
  • ordered intermetallic
  • titanium aluminide

ASJC Scopus subject areas

  • Condensed Matter Physics

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