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Metals 2016, 6(1), 10; doi:10.3390/met6010010

In Situ Characterization Techniques Based on Synchrotron Radiation and Neutrons Applied for the Development of an Engineering Intermetallic Titanium Aluminide Alloy

1
Recipient of a DOC Fellowship of the Austrian Academy of Sciences at the Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Roseggerstraße 12, 8700 Leoben, Austria
2
Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Roseggerstraße 12, 8700 Leoben, Austria
3
Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max Planck-Straße 1, 21502 Geesthacht, Germany
4
The Bragg Institute, Australian Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights, NSW 2234, Australia
Current address: ABB Corporate Research Center, Segelhofstrasse 1K, 5405 Baden-Dättwil, Switzerland
Current address: Böhler Edelstahl GmbH & Co KG, Mariazellerstraße 25, 8605 Kapfenberg, Austria
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 30 November 2015 / Revised: 21 December 2015 / Accepted: 23 December 2015 / Published: 4 January 2016
(This article belongs to the Special Issue Metals Challenged by Neutron and Synchrotron Radiation)
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Abstract

Challenging issues concerning energy efficiency and environmental politics require novel approaches to materials design. A recent example with regard to structural materials is the emergence of lightweight intermetallic TiAl alloys. Their excellent high-temperature mechanical properties, low density and high stiffness constitute a profile perfectly suitable for their application as advanced aero-engine turbine blades or as turbocharger turbine wheels in next-generation automotive engines. As the properties of TiAl alloys during processing as well as during service are dependent on the phases occurring, detailed knowledge of their volume fractions and distribution within the microstructure is of paramount importance. Furthermore, the behavior of the individual phases during hot deformation and subsequent heat treatments is of interest to define reliable and cost-effective industrial production processes. In situ high-energy X-ray diffraction methods allow tracing the evolution of phase fractions over a large temperature range. Neutron diffraction unveils information on order-disorder transformations in TiAl alloys. Small-angle scattering experiments offer insights into the materials’ precipitation behavior. This review attempts to shine a light on selected in situ diffraction and scattering techniques and the ways in which they promoted the development of an advanced engineering TiAl alloy. View Full-Text
Keywords: titanium aluminides based on γ-TiAl; high-energy X-ray diffraction; phase transformations; neutron diffraction; order/disorder transformations; small-angle scattering; thermo-mechanical processing; heat treatments; microstructure evolution titanium aluminides based on γ-TiAl; high-energy X-ray diffraction; phase transformations; neutron diffraction; order/disorder transformations; small-angle scattering; thermo-mechanical processing; heat treatments; microstructure evolution
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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

Erdely, P.; Schmoelzer, T.; Schwaighofer, E.; Clemens, H.; Staron, P.; Stark, A.; Liss, K.-D.; Mayer, S. In Situ Characterization Techniques Based on Synchrotron Radiation and Neutrons Applied for the Development of an Engineering Intermetallic Titanium Aluminide Alloy. Metals 2016, 6, 10.

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