In-situ characterization of phase transformations and microstructure evolution in a γ-tial based alloy

Klaus Dieter Liss*, Arno Bartels, Helmut Clemens, Andreas Stark, Thomas Buslaps, Dominic Phelan, La Reine A. Yeoh

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

Phase diagrams and microstructures of titanium aluminides are rather complex and, so far, tittle data were observed in-situ at elevated temperatures. We report on two-dimensional high energy X-ray diffraction and complementary laser scanning confocal microscopy to characterize the appearing phases and to follow the phase evolution in-situ and in real time. As an example, the microstructure evolution of a quenched γ-TiAl alloy, consisting of α2-Ti3Al grains at room temperature, has been followed in both reciprocal and direct space as a function of temperature up to 1400°C. At 700 - 800°C extremely fine γ-laths are formed in α2-grains occurring through an oriented rearrangement of atoms. Streaks linking reflections of both phases testify from coherent lattice and orientation gradients in the transforming crystallite. At temperatures around the eutectoid temperature recrystallization effects and the γ→α phase transition take place leading to grain refinement.

Original languageEnglish
Title of host publicationStructural Aluminides for Elevated Temperatures
Subtitle of host publicationGamma Titanium and other Metallic Aluminides - Proc. Structural Aluminides for Elevated Temperatures Symposium, held during TMS 2008 Annual Meeting Exhib.
Pages137-144
Number of pages8
StatePublished - 2008
Externally publishedYes
EventStructural Aluminides for Elevated Temperatures Symposium, TMS 2008 Annual Meeting and Exhibition - New Orleans, LA, United States
Duration: 9 Mar 200813 Mar 2008

Publication series

NameTMS Annual Meeting

Conference

ConferenceStructural Aluminides for Elevated Temperatures Symposium, TMS 2008 Annual Meeting and Exhibition
CountryUnited States
CityNew Orleans, LA
Period9/03/0813/03/08

Keywords

  • High-energy X-rays
  • In-situ
  • Laser scanning microscopy
  • Phase transformation
  • Real-time
  • Synchrotron radiation
  • Titanium aluminide

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