Oxygen diffusion in Ti3Al single crystals

Y. Koizumi, M. Kishimoto, Y. Minamino, H. Nakajima

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Diffusion coefficients of oxygen in directions parallel to the c- (D c) and a-axis (Da) of Ti3Al single crystals were measured by oxygen implantation and Auger electron spectroscopy. The temperature dependence of DC and Da in the temperature range 723 - 1073 K is expressed as: DC =7:3-2:2 +3.1 × 10-9 exp(-187:3 ± 2:7[kJ/mol]=RT) [m2=s] and Da = 4:72:0+3.3× 109 exp(-184:8 ± 4:0[kJ/mol]/RT) [m2/s], respectively. The diffusion coefficients are three orders of magnitude less than those in α-Ti. The value of DC/Da is within the range 0.94 - 1.11 and the diffusion anisotropy is weak, despite the anisotropic arrangement of octahedral sites. The diffusion mechanism is discussed in terms of the ordered arrangement of two types of octahedral sites occupied by oxygen atoms.

Original languageEnglish
Pages (from-to)2991-3010
Number of pages20
JournalPhilosophical Magazine
Volume88
Issue number24
DOIs
Publication statusPublished - 2008 Aug

Keywords

  • Anisotropy
  • Impurity diffusion
  • Intermetallic compound
  • Interstitial
  • Oxygen
  • Titanium aluminide

ASJC Scopus subject areas

  • Condensed Matter Physics

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