Microstructure and Tensile Behavior of Al8Co17Cr17Cu8Fe17Ni33 (at.%) High-Entropy Alloy |
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Authors: | H M Daoud A Manzoni R Völkl N Wanderka U Glatzel |
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Affiliation: | 1. Metals and Alloys, University Bayreuth, Ludwig-Thoma-Str. 36b, 95447, Bayreuth, Germany 2. Helmholtz-Zentrum Berlin für Materialien und Energie Berlin GmbH, Hahn-Meitner-Platz 1, 14109, Berlin, Germany
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Abstract: | Microstructure evolution and tensile behavior of the high-entropy alloy Al8Co17Cr17Cu8Fe17Ni33 (at.%) are investigated at room temperature and at 500°C in the as-cast state and under different heat-treatment conditions. Detailed microstructural characterizations are carried out using optical microscopy, scanning electron microscopy, and transmission electron microscopy. The equilibrium phase evolution as a function of temperature was calculated using the Thermo-Calc software (Thermo-Calc Software, Stockholm, Sweden) integrated with TTNi-7 database. The observed majority phase is a face-centered cubic solid solution for all tested specimens. Tensile ductility at room temperature and at elevated temperature is enhanced by heat treatment at 1150°C. An embrittlement phenomenon has been observed after a heat treatment at 700°C resulting in significant degradation in tensile properties. |
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