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In situ high-energy X-ray diffraction study and quantitative phase analysis in the α + γ phase field of titanium aluminides

Authors
Journal
Scripta Materialia
1359-6462
Publisher
Elsevier
Publication Date
Volume
57
Issue
12
Identifiers
DOI: 10.1016/j.scriptamat.2007.08.021
Keywords
  • Titanium Aluminides
  • Intermetallic Compounds
  • Order–Disorder Phenomena
  • Phase Transformation Kinetics
  • Synchrotron Radiation

Abstract

Quantitative atomic structure and phase analysis in the titanium aluminide intermetallic system of composition Ti–45Al–7.5Nb–0.5C (at.%) was conducted in situ by use of high-energy X-ray diffraction from a synchrotron and evaluated using the Rietveld method, implementing a model for atomic order in the α-phase which describes the order to disorder transition α 2 → α at the eutectoid temperature. The order parameter exhibits unexpected behavior and is entangled with the competition of different kinetic processes.

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