Hot deformation of cast and extruded TiAl: An in-situ diffraction study

Authors

Thomas Schmoelzer, Montanuniversitat Leoben
Klaus-Dieter Liss, Australian Nuclear Science and Technology OrganisationFollow
Svea Mayer, Montanuniversitat Leoben
Kun Yan, University of WollongongFollow
Mark H. Reid, University of WollongongFollow
Rian J. Dippenaar, University of WollongongFollow
Matthew Peel, European Synchrotron Radiation Facility
Helmut Clemens, Montanuniversitat Leoben

RIS ID

51711

Publication Details

Schmoelzer, T., Liss, K., Mayer, S., Yan, K., Reid, M., Dippenaar, R., Peel, M. & Clemens, H. (2012). Hot deformation of cast and extruded TiAl: An in-situ diffraction study. Materials Science Forum, 706-709 1725-1730.

Abstract

Intermetallic TiAl alloys are a class of innovative high-temperature materials which are developed to replace the substantially denser Ni-base alloys in low-pressure turbine blades of jet engines. By streamlining the production process of these parts, a substantial decrease in production costs can be achieved. To this end, a profound knowledge of the microstructural processes occurring during hot deformation is a prerequisite. To investigate the microstructural development during forming operations, cast and extruded as well as only cast specimens were hot-deformed and the microstructural development investigated in-situ by means of a novel diffraction method. This powder diffraction method utilizes the behavior of individual reflection spots on the Debye-Scherrer rings for deriving the materials response to the deformation imposed. It was found that the behavior of the two specimens is rather similar, although the starting microstructures show pronounced differences.