An Advanced TiAl Alloy for High-Performance Racing Applications
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Department of Materials Science, Montanuniversität Leoben, Roseggerstr. 12, 8700 Leoben, Austria
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GfE Fremat GmbH, Gewerbegebiet Süd 20, 09618 Brand-Erbisdorf, Germany
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Märkisches Werk GmbH, Haus Heide 21, D-58553 Halver, Germany
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GfE Metalle und Materialien GmbH, Höfener Str. 45, 90431 Nuremberg, Germany
*
Author to whom correspondence should be addressed.
†
Present address: LKR Light Metals Technologies Ranshofen, Austrian Institute of Technology, Postfach 26, 5282 Ranshofen, Austria.
Materials 2020, 13(21), 4720; https://doi.org/10.3390/ma13214720
Received: 23 September 2020
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Revised: 19 October 2020
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Accepted: 20 October 2020
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Published: 22 October 2020
(This article belongs to the Special Issue High Temperature Alloys and Intermetallic Materials)
Requirements and strict regulations for high-performance racing applications involve the use of new and innovative lightweight structural materials. Therefore, intermetallic γ-TiAl-based alloys enable new opportunities in the field due to their lower density compared to commonly used Ni-base superalloys. In this study, a β-solidifying TiAl alloy was examined toward its use as structural material for inlet and outlet valves. The nominal composition of the investigated TNM alloy is Ti–43.5Al–4Nb–1Mo–0.1B (in at%), which enables an excellent formability at elevated temperatures due to the presence of bcc β-phase. Different hot-extrusion tests on an industrial scale were conducted on the cast and hot isostatic pressed material to determine the ideal microstructure for the respective racing application. To simulate these operation conditions, hot tensile tests, as well as rotational bending tests, at room temperature were conducted. With a higher degree of deformation, an increasing strength and fatigue limit was obtained, as well as a significant increment of ductility. The fracture surfaces of the rotational bending test specimens were analyzed using scanning electron microscopy, revealing the relationship between crack initiation and microstructural constituents. The results of this study show that the mechanical performance of extruded TiAl material can be tailored via optimizing the degree of hot-extrusion.
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Keywords:
intermetallics; titanium aluminides; grains and interfaces; casting methods; microstructural characterization; electron microscopy; fracture behavior; fatigue
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MDPI and ACS Style
Burtscher, M.; Klein, T.; Lindemann, J.; Lehmann, O.; Fellmann, H.; Güther, V.; Clemens, H.; Mayer, S. An Advanced TiAl Alloy for High-Performance Racing Applications. Materials 2020, 13, 4720. https://doi.org/10.3390/ma13214720
AMA Style
Burtscher M, Klein T, Lindemann J, Lehmann O, Fellmann H, Güther V, Clemens H, Mayer S. An Advanced TiAl Alloy for High-Performance Racing Applications. Materials. 2020; 13(21):4720. https://doi.org/10.3390/ma13214720
Chicago/Turabian StyleBurtscher, Michael, Thomas Klein, Janny Lindemann, Oliver Lehmann, Holger Fellmann, Volker Güther, Helmut Clemens, and Svea Mayer. 2020. "An Advanced TiAl Alloy for High-Performance Racing Applications" Materials 13, no. 21: 4720. https://doi.org/10.3390/ma13214720
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