Thermal stability of the omega phase in Zr-containing TiAl alloys

H-X Jiang, Dawei Hu, Xinhua Wu

Research output: Contribution to journalArticle

33 Citations (Scopus)


The thermal stability of omega phase in TiAl alloys has been investigated using scanning and transmission electron microscopy and it has been found that Zr has a strong effect in stabilising the omega phase. in Ti-44Al-4Nb-4Zr-0.2Si-1B the omega solvus was determined as just over 900 degrees C. Increasing additions of Zr to Ti-44Al-4Nb-2Mo resulted in an increase in the volume fraction of omega phase at 700 degrees C and the omega particle distribution was changed from localised to uniformly distributed omega. In the alloy with 2 at% Zr, omega particles were found uniformly throughout the B2 matrix at 700 degrees C. (C) 2008 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)134-138
Number of pages5
JournalJournal of Alloys and Compounds
Issue number1-2
Publication statusPublished - 1 May 2009


  • Phase transitions
  • TEM
  • Intermetallics
  • Microstructure


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