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Open AccessArticle

Dynamic Shear Deformation of a Precipitation Hardened Al0.7CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry

1
Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, USA
2
U.S. Army Research Laboratory, Aberdeen Proving Ground, Aberdeen, MD 21005, USA
3
Advanced Materials and Manufacturing Processes Institute, University of North Texas, Denton, TX 76207, USA
*
Authors to whom correspondence should be addressed.
Entropy 2020, 22(4), 431; https://doi.org/10.3390/e22040431
Received: 6 March 2020 / Revised: 3 April 2020 / Accepted: 9 April 2020 / Published: 10 April 2020
(This article belongs to the Special Issue Future Directions of High Entropy Alloys)
Lamellar eutectic structure in Al0.7CoCrFeNi high-entropy alloy (HEA) is emerging as a promising candidate for structural applications because of its high strength-ductility combination. The alloy consists of a fine-scale lamellar fcc + B2 microstructure with high flow stresses > 1300 MPa under quasi-static tensile deformation and >10% ductility. The response to shear loading was not investigated so far. This is the first report on the shear deformation of a eutectic structured HEA and effect of precipitation on shear deformation. A split-Hopkinson pressure bar (SHPB) was used to compress the hat-shaped specimens to study the local dynamic shear response of the alloy. The change in the width of shear bands with respect to precipitation and deformation rates was studied. The precipitation of L12 phase did not delay the formation of adiabatic shear bands (ASB) or affect the ASB width significantly, however, the deformed region around ASB, consisting of high density of twins in fcc phase, was reduced from 80 µm to 20 µm in the stronger precipitation strengthened condition. We observe dynamic recrystallization of grains within ASBs and local mechanical response of individual eutectic lamellae before and after shear deformation and within the shear bands was examined using nano-indentation. View Full-Text
Keywords: eutectic high-entropy alloy; dynamic shear deformation; split-Hopkinson pressure bar test; hat-shaped specimen; nano-indentation eutectic high-entropy alloy; dynamic shear deformation; split-Hopkinson pressure bar test; hat-shaped specimen; nano-indentation
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Gwalani, B.; Wang, T.; Jagetia, A.; Gangireddy, S.; Muskeri, S.; Mukherjee, S.; Lloyd, J.T.; Banerjee, R.; Mishra, R.S. Dynamic Shear Deformation of a Precipitation Hardened Al0.7CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry. Entropy 2020, 22, 431.

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