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Open AccessArticle

Microstructure and Mechanical Properties of Precipitate Strengthened High Entropy Alloy Al10Co25Cr8Fe15Ni36Ti6 with Additions of Hafnium and Molybdenum

1
Metals and Alloys, University Bayreuth, 95440 Bayreuth, Germany
2
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 14109 Berlin, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Yong Zhang
Entropy 2019, 21(2), 169; https://doi.org/10.3390/e21020169
Received: 28 January 2019 / Revised: 8 February 2019 / Accepted: 8 February 2019 / Published: 12 February 2019
(This article belongs to the Special Issue New Advances in High-Entropy Alloys)
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Abstract

High entropy or compositionally complex alloys provide opportunities for optimization towards new high-temperature materials. Improvements in the equiatomic alloy Al17Co17Cr17Cu17Fe17Ni17 (at.%) led to the base alloy for this work with the chemical composition Al10Co25Cr8Fe15Ni36Ti6 (at.%). Characterization of the beneficial particle-strengthened microstructure by scanning electron microscopy (SEM) and observation of good mechanical properties at elevated temperatures arose the need of accomplishing further optimization steps. For this purpose, the refractory metals hafnium and molybdenum were added in small amounts (0.5 and 1.0 at.% respectively) because of their well-known positive effects on mechanical properties of Ni-based superalloys. By correlation of microstructural examinations using SEM with tensile tests in the temperature range of room temperature up to 900 °C, conclusions could be drawn for further optimization steps. View Full-Text
Keywords: HEA; high entropy alloys; compositionally complex alloys; mechanical characterization HEA; high entropy alloys; compositionally complex alloys; mechanical characterization
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Haas, S.; Manzoni, A.M.; Krieg, F.; Glatzel, U. Microstructure and Mechanical Properties of Precipitate Strengthened High Entropy Alloy Al10Co25Cr8Fe15Ni36Ti6 with Additions of Hafnium and Molybdenum. Entropy 2019, 21, 169.

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