The ordering behaviour of the O phase in Ti2AlNb-based alloys

Bo Wu, Jianyun Shen, Maoyou Chu, Shunli Shang, Zhu Zhang, Delin Peng, Songqing Liu

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Based on the investigation of Muraleedharan et al. [Intermetallics 3 (1995) 187] concerning the order-disorder transition of O phase in Ti2AlNb-based alloy, the site occupations of the alloying elements are clarified and the ordering behaviour of the O phase in Ti-yAl-zNb (y≥25 at.%) alloys is investigated with a Bragg-Williams model. As a result, the relationship among the long-range order parameter (s), temperature (T), and the composition of the O phase (y, z) is established. In the temperature and composition range where the O phase exists, there is a continuously ordering character in the ordering behaviour of the O phase. Also the first-order transition character is very 'weak'.

Original languageEnglish (US)
Pages (from-to)979-984
Number of pages6
Issue number10
StatePublished - Oct 2002

All Science Journal Classification (ASJC) codes

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


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