Recrystallization and phase transitions in a γ-TiAl-based alloy as observed by ex situ and in situ high-energy X-ray diffraction

Klaus Dieter Liss*, Arno Bartels, Helmut Clemens, Slawomir Bystrzanowski, Andreas Stark, Thomas Buslaps, Frank Peter Schimansky, Rainer Gerling, Christina Scheu, Andreas Schreyer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

High-energy synchrotron X-ray diffraction is a novel and powerful tool for bulk studies of materials and is applied to the investigation of a high Nb-bearing γ-TiAl-based alloy. The results determined from ex situ diffraction patterns of differently heat-treated samples are compared with those from metallographic examinations. The diffraction angles and also the morphology of reflections on the Debye-Scherrer rings are evaluated in order to determine lattice parameters and grain sizes as well as crystallographic correlation. An in situ heating cycle from room temperature to 1362 °C has been conducted starting from massively transformed γ-TiAl. With increasing temperature, the occurrence of strain relaxation, chemical and phase separation, domain orientations, phase transitions, recrystallization processes, and subsequent grain growth can be observed. Finally, a fully lamellar structure, well oriented with respect to the high-temperature phase, is formed. The data obtained by high-energy synchrotron X-ray diffraction, which contain extremely rich information, are interpreted step by step and relate well with the ex situ observations and metallographic examinations.

Original languageEnglish
Pages (from-to)3721-3735
Number of pages15
JournalActa Materialia
Volume54
Issue number14
DOIs
StatePublished - Aug 2006
Externally publishedYes

Keywords

  • Synchrotron radiation
  • Titanium aluminides

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