In and ex situ investigations of the β-phase in a Nb and Mo containing γ-TiAl based alloy

H. Clemens*, H. F. Chladil, W. Wallgram, G. A. Zickler, R. Gerling, K. D. Liss, S. Kremmer, V. Güther, W. Smarsly

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

158 Scopus citations

Abstract

In a β-stabilized Ti-43Al-4Nb-1Mo-0.1B alloy (composition in atomic percent) the correlation between the occurrence of β-phase and temperature was analyzed experimentally and compared to thermodynamic calculations. Results from in situ high-energy X-ray diffraction, texture measurements, heat treatments, scanning electron microscopy, and temperature-dependent flow stress measurements were used to study the evolution of the β-phase with temperature. Thermodynamic calculations based on the CALPHAD method were applied to correlate the phases developed in the β-solidifying TiAl based alloy under investigation. This alloy is characterized by an adjustable β-phase volume fraction at temperatures where hot-work processes such as forging and rolling are conducted. Due to a high volume fraction of β-phase at elevated temperatures the hot-extruded alloy can be forged under near conventional conditions.

Original languageEnglish
Pages (from-to)827-833
Number of pages7
JournalIntermetallics
Volume16
Issue number6
DOIs
StatePublished - Jun 2008
Externally publishedYes

Keywords

  • A. Titanium aluminides, based on TiAl
  • B. Alloy design
  • B. phase identification
  • B. texture
  • E. Phase diagram, prediction

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