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Metals 2015, 5(4), 2252-2265; doi:10.3390/met5042252

In Situ High-Energy X-ray Diffraction during Hot-Forming of a Multiphase TiAl Alloy

1
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Geesthacht 21502, Germany
2
Institute of Materials Physics and Technology, Hamburg University of Technology, Hamburg 21073, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Klaus-Dieter Liss
Received: 28 September 2015 / Revised: 19 November 2015 / Accepted: 23 November 2015 / Published: 30 November 2015
(This article belongs to the Special Issue Metals Challenged by Neutron and Synchrotron Radiation)
View Full-Text   |   Download PDF [1160 KB, uploaded 30 November 2015]   |  

Abstract

Intermetallic γ-TiAl based alloys exhibit excellent high-temperature strength combined with low density. This makes them ideal candidates for replacing the twice as dense Ni base super-alloys, currently used in the medium temperature range (~700 °C) of industrial and aviation gas turbines. An important step towards the serial production of TiAl parts is the development of suitable hot-forming processes. Thermo-mechanical treatments often result in mechanical anisotropy due to the formation of crystallographic textures. However, with conventional texture analysis techniques, their formation can only be studied after processing. In this study, in situ high-energy X-ray diffraction measurements with synchrotron radiation were performed during hot-forming. Thus, it was possible to record the evolution of the phase constitution as well as the formation of crystallographic texture of different phases directly during processing. Several process temperatures (1100 °C to 1300 °C) and deformation rates were investigated. Based on these experiments, a process window can be recommended which results in the formation of an optimal reduced texture. View Full-Text
Keywords: crystallographic texture; X-ray diffraction; synchrotron radiation; intermetallic alloy; titanium aluminides based on γ-TiAl; hot-forming; thermo-mechanical processing; phase constitution crystallographic texture; X-ray diffraction; synchrotron radiation; intermetallic alloy; titanium aluminides based on γ-TiAl; hot-forming; thermo-mechanical processing; phase constitution
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Stark, A.; Rackel, M.; Tchouaha Tankoua, A.; Oehring, M.; Schell, N.; Lottermoser, L.; Schreyer, A.; Pyczak, F. In Situ High-Energy X-ray Diffraction during Hot-Forming of a Multiphase TiAl Alloy. Metals 2015, 5, 2252-2265.

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