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Metals 2017, 7(4), 111; doi:10.3390/met7040111

Deformation Behavior of Al0.25CoCrFeNi High-Entropy Alloy after Recrystallization

Laboratory of Applied Physics and Mechanics of Advanced Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
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Received: 27 December 2016 / Revised: 12 March 2017 / Accepted: 21 March 2017 / Published: 24 March 2017
(This article belongs to the Special Issue High-Entropy Alloys (HEAs))
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Abstract

Cold rolling with subsequent annealing can be used to produce the recrystallized structure in high entropy alloys (HEAs). The Al0.25CoCrFeNi HEAs rolled to different final thickness (230, 400, 540, 800, 1000, 1500 μm) are prepared to investigate their microstructure evolutions and mechanical behaviors after annealing. Only the single face-centered cubic phase was obtained after cold rolling and recrystallization annealing at 1100 °C for 10 h. The average recrystallized grain size in this alloy after annealing ranges from 92 μm to 136 μm. The annealed thin sheets show obviously size effects on the flow stress and formability. The yield strength and tensile strength decrease as t/d (thickness/average grain diameter) ratio decreases until the t/d approaches 2.23. In addition, the stretchability (formability) decreases with the decrease of the t/d ratio especially when the t/d ratio is lower than about 6. According to the present results, yield strength can be expressed as a function of the t/d ratio. View Full-Text
Keywords: high-entropy alloys; recrystallization; mechanical properties; size effects; cold-rolling high-entropy alloys; recrystallization; mechanical properties; size effects; cold-rolling
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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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Hou, J.; Zhang, M.; Yang, H.; Qiao, J. Deformation Behavior of Al0.25CoCrFeNi High-Entropy Alloy after Recrystallization. Metals 2017, 7, 111.

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