Phase transitions and recrystallization in a Ti-46at%Al-9at%Nb alloy as observed by in-situ high-energy X-ray diffraction

Klaus Dieter Liss*, Helmut Clemens, Arno Bartels, Andreas Stark, Thomas Buslaps

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations

Abstract

High-energy synchrotron X-ray diffraction is a powerful tool for bulk studies of materials. In this investigation, it is applied to the investigation of an intermetallic γ-TiAl based alloy with a composition of Ti-46Al-9Nb. The morphology of the reflections on the Debye-Scherrer rings is evaluated in order to approach grain sizes as well as crystallographic correlations. An in-situ heating cycle from room temperature to a temperature above the α-transus temperature has been conducted starting from a massively transformed sample. 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. During cooling to room temperature, crystallographic correlations between the re-appearing γ-phase and the host α-phase, known as the Blackburn correlation, are observed in the reciprocal lattice, which splits into different twinning and domain orientation relationships present in the fully lamellar microstructure.

Original languageEnglish
Pages (from-to)425-430
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume980
StatePublished - 2007
Externally publishedYes
Event2006 MRS Fall Meeting - Boston, MA, United States
Duration: 27 Nov 20061 Dec 2006

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