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Entropy 2016, 18(4), 104;

On the Path to Optimizing the Al-Co-Cr-Cu-Fe-Ni-Ti High Entropy Alloy Family for High Temperature Applications

Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, D-14109 Berlin, Germany
Department of Physics and Nanotechnology, SRM University, Kattankulathur, Kancheepuram Dt 603 203, India
Metals and Alloys, University Bayreuth, Ludwig-Thoma-Str. 36b, D - 95447 Bayreuth, Germany
PFARR STANZTECHNIK GmbH, Am kleinen Sand 1, 36419 Buttlar, Germany
Author to whom correspondence should be addressed.
Academic Editor: An-Chou Yeh
Received: 19 February 2016 / Revised: 14 March 2016 / Accepted: 15 March 2016 / Published: 23 March 2016
(This article belongs to the Special Issue High-Entropy Alloys and High-Entropy-Related Materials)
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The most commonly investigated high entropy alloy, AlCoCrCuFeNi, has been chosen for optimization of its microstructural and mechanical properties by means of compositional changes and heat treatments. Among the different available optimization paths, the decrease of segregating element Cu, the increase of oxidation protective elements Al and Cr and the approach towards a γ-γ′ microstructure like in Ni-based superalloys have been probed and compared. Microscopical observations have been made for every optimization step. Vickers microhardness measurements and/or tensile/compression test have been carried out when the alloy was appropriate. Five derived alloys AlCoCrFeNi, Al23Co15Cr23Cu8Fe15Ni16, Al8Co17Cr17Cu8Fe17Ni33, Al8Co17Cr14Cu8Fe17Ni34.8Mo0.1Ti1W0.1 and Al10Co25Cr8Fe15Ni36Ti6 (all at.%) have been compared to the original AlCoCrCuFeNi and the most promising one has been selected for further investigation. View Full-Text
Keywords: high entropy alloys; microstructure; transmission electron microscopy high entropy alloys; microstructure; transmission electron microscopy

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Manzoni, A.M.; Singh, S.; Daoud, H.M.; Popp, R.; Völkl, R.; Glatzel, U.; Wanderka, N. On the Path to Optimizing the Al-Co-Cr-Cu-Fe-Ni-Ti High Entropy Alloy Family for High Temperature Applications. Entropy 2016, 18, 104.

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