Study of nanometer-scaled lamellar microstructure in a Ti-45Al-7.5Nb alloy - Experiments and modeling

F. D. Fischer*, T. Waitz, Ch Scheu, L. Cha, G. Dehm, T. Antretter, H. Clemens

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Quenching of Ti-45 at%Al-7.5 at%Nb from the single α-phase region to room temperature followed by aging below the eutectoid temperature leads to the precipitation of ultra-fine γ-TiAl lamellae. In addition to an extensive experimental program, reported by Cha et al. in Intermetallics 16 (2008) 868-875, in this work a micromechanical and thermodynamical model is presented for the formation of γ-TiAl lamellae within the α2-Ti3Al parent phase. A global transformation condition allows to predict a thickness to length ratio in accordance with experimental observations. Furthermore, a local transformation condition offers the basis for a kinetic law. The modeling concept can be applied to similar problems of combined diffusive and displacive phase transformations.

Original languageEnglish
Pages (from-to)509-517
Number of pages9
JournalIntermetallics
Volume18
Issue number4
DOIs
StatePublished - Apr 2010
Externally publishedYes

Keywords

  • A. Titanium aluminides
  • B. Phase transformation
  • C. Thermal treatment
  • D. Microstructure
  • E. Modeling

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