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Dynamic Shear Deformation of a Precipitation Hardened Al(0.7)CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry

Lamellar eutectic structure in Al(0.7)CoCrFeNi 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...

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Autores principales: Gwalani, Bharat, Wang, Tianhao, Jagetia, Abhinav, Gangireddy, Sindhura, Muskeri, Saideep, Mukherjee, Sundeep, Lloyd, Jeffrey T., Banerjee, Rajarshi, Mishra, Rajiv S.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7516913/
https://www.ncbi.nlm.nih.gov/pubmed/33286204
http://dx.doi.org/10.3390/e22040431
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author Gwalani, Bharat
Wang, Tianhao
Jagetia, Abhinav
Gangireddy, Sindhura
Muskeri, Saideep
Mukherjee, Sundeep
Lloyd, Jeffrey T.
Banerjee, Rajarshi
Mishra, Rajiv S.
author_facet Gwalani, Bharat
Wang, Tianhao
Jagetia, Abhinav
Gangireddy, Sindhura
Muskeri, Saideep
Mukherjee, Sundeep
Lloyd, Jeffrey T.
Banerjee, Rajarshi
Mishra, Rajiv S.
author_sort Gwalani, Bharat
collection PubMed
description Lamellar eutectic structure in Al(0.7)CoCrFeNi 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 L1(2) 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.
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spelling pubmed-75169132020-11-09 Dynamic Shear Deformation of a Precipitation Hardened Al(0.7)CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry Gwalani, Bharat Wang, Tianhao Jagetia, Abhinav Gangireddy, Sindhura Muskeri, Saideep Mukherjee, Sundeep Lloyd, Jeffrey T. Banerjee, Rajarshi Mishra, Rajiv S. Entropy (Basel) Article Lamellar eutectic structure in Al(0.7)CoCrFeNi 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 L1(2) 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. MDPI 2020-04-10 /pmc/articles/PMC7516913/ /pubmed/33286204 http://dx.doi.org/10.3390/e22040431 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Gwalani, Bharat
Wang, Tianhao
Jagetia, Abhinav
Gangireddy, Sindhura
Muskeri, Saideep
Mukherjee, Sundeep
Lloyd, Jeffrey T.
Banerjee, Rajarshi
Mishra, Rajiv S.
Dynamic Shear Deformation of a Precipitation Hardened Al(0.7)CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry
title Dynamic Shear Deformation of a Precipitation Hardened Al(0.7)CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry
title_full Dynamic Shear Deformation of a Precipitation Hardened Al(0.7)CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry
title_fullStr Dynamic Shear Deformation of a Precipitation Hardened Al(0.7)CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry
title_full_unstemmed Dynamic Shear Deformation of a Precipitation Hardened Al(0.7)CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry
title_short Dynamic Shear Deformation of a Precipitation Hardened Al(0.7)CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry
title_sort dynamic shear deformation of a precipitation hardened al(0.7)cocrfeni eutectic high-entropy alloy using hat-shaped specimen geometry
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7516913/
https://www.ncbi.nlm.nih.gov/pubmed/33286204
http://dx.doi.org/10.3390/e22040431
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