In situ synchrotron high-energy X-ray diffraction analysis on phase transformations in Ti-Al alloys processed by equal-channel angular pressing

Klaus Dieter Liss*, Ross E. Whitfield, Wei Xu, Thomas Buslaps, Lareine A. Yeoh, Xiaolin Wu, Deliang Zhang, Kenong Xia

*Corresponding author for this work

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Mixtures of 47-Al and 53-Ti powders (atomic %) have been consolidated using back pressure equal-channel angular pressing starting with both raw and ball-milled powders. In situ synchrotron high-energy X-ray diffraction studies are presented with continuous Rietveld analysis obtained upon a heating ramp from 300 K to 1075 K performed after the consolidation process. Initial phase distributions contain all intermetallic compounds of this system except Al, with distribution maxima in the outer regions of the concentrations (α-Ti, TiAl3). Upon annealing, the phase evolution and lattice parameter changes owing to chemical segregation, which is in favour for the more equilibrated phases such as γ-TiAl, α2-Ti3Al and TiAl2, were followed unprecedentedly in detail. An initial δ-TiH2 content with a phase transition at about 625 K upon heating created an intermediate Β-Ti phase which played an important role in the reaction chain and gradually transformed into the final products.

Original languageEnglish
Pages (from-to)825-834
Number of pages10
JournalJournal of Synchrotron Radiation
Volume16
Issue number6
DOIs
Publication statusPublished - 2009
Externally publishedYes

Keywords

  • Al
  • Phase equilibria
  • Phase transformation
  • Powder metallurgy
  • Structural
  • Ti
  • X-ray diffraction

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