Study of nanometer-scaled lamellar microstructure in a Ti-45Al-7.5Nb alloy - Experiments and modeling
- Author(s)
- Franz Dieter Fischer, Thomas Waitz, Christina Scheu, Limei Cha, Gerhard Dehm, Thomas Antretter, Helmut J. Clemens
- Abstract
Quenching of Ti-45 at%Al-7.5 at%Nb from the single alpha-phase region to room temperature followed by aging below the eutectoid temperature leads to the precipitation of ultra-fine gamma-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 gamma-TiAl lamellae within the alpha(2)-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.
- Organisation(s)
- Physics of Nanostructured Materials
- External organisation(s)
- Montanuniversität Leoben, Ludwig-Maximilians-Universität München
- Journal
- Intermetallics
- Volume
- 18
- Pages
- 509-517
- No. of pages
- 9
- ISSN
- 0966-9795
- DOI
- https://doi.org/10.1016/j.intermet.2009.09.012
- Publication date
- 2010
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103018 Materials physics
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/study-of-nanometerscaled-lamellar-microstructure-in-a-ti45al75nb-alloy--experiments-and-modeling(cddbb733-c560-4b76-bb62-ac4c21e5892b).html