A Study of Recrystallization and Phase Transitions in Intermetallic Titanium Aluminides by In Situ High-Energy X-Ray Diffraction

Abstract:

High-energy synchrotron X-ray diffraction is a novel and powerful tool for bulk studies of materials. In this study, it is applied for the investigation of an intermetallic γ-TiAl based alloy. Not only the diffraction angles, but also the morphology of reflections on the Debye-Scherrer rings are evaluated in order to approach lattice parameters and grain sizes as well as crystallographic relationships. An in-situ heating cycle from room temperature to 1362 °C has been conducted starting from massively transformed γ-TiAl which exhibits high internal stresses. 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. The data obtained by high-energy synchrotron X-ray diffraction, extremely rich in information, are interpreted step by step.

• Periodical: Materials Science Forum (Volumes 539-543)
• Pages: 1519-1524
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.539-543.1519
• Online since: March 2007
• Authors: Klaus Dieter Liss, A. Bartels, Helmut Clemens, S. Bystrzanowski, A. Stark, Thomas Buslaps, Frank Peter Schimansky, Rainer Gerling, Andreas Schreyer
• Keywords: Grain Growth, In Situ Experiment, Phase Transformation, Recrystallization, Synchrotron Radiation (XRD), Titanium Aluminide

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