{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T13:01:11Z","timestamp":1791550871776,"version":"4.3.4"},"reference-count":30,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2020,4,10]],"date-time":"2020-04-10T00:00:00Z","timestamp":1586476800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100006754","name":"Army Research Laboratory","doi-asserted-by":"publisher","award":["W911NF-16-2-0189"],"award-info":[{"award-number":["W911NF-16-2-0189"]}],"id":[{"id":"10.13039\/100006754","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Entropy"],"abstract":"<jats:p>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 &gt; 1300 MPa under quasi-static tensile deformation and &gt;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 \u00b5m to 20 \u00b5m 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.<\/jats:p>","DOI":"10.3390\/e22040431","type":"journal-article","created":{"date-parts":[[2020,4,13]],"date-time":"2020-04-13T04:45:31Z","timestamp":1586753131000},"page":"431","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":31,"title":["Dynamic Shear Deformation of a Precipitation Hardened Al0.7CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry"],"prefix":"10.3390","volume":"22","author":[{"given":"Bharat","family":"Gwalani","sequence":"first","affiliation":[{"name":"Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tianhao","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abhinav","family":"Jagetia","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sindhura","family":"Gangireddy","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Saideep","family":"Muskeri","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1954-0045","authenticated-orcid":false,"given":"Sundeep","family":"Mukherjee","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeffrey T.","family":"Lloyd","sequence":"additional","affiliation":[{"name":"U.S. Army Research Laboratory, Aberdeen Proving Ground, Aberdeen, MD 21005, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rajarshi","family":"Banerjee","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, USA"},{"name":"Advanced Materials and Manufacturing Processes Institute, University of North Texas, Denton, TX 76207, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rajiv S.","family":"Mishra","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering, University of North Texas, Denton, TX 76207, USA"},{"name":"Advanced Materials and Manufacturing Processes Institute, University of North Texas, Denton, TX 76207, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2020,4,10]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"269","DOI":"10.1016\/j.msea.2006.06.099","article-title":"Effect of friction stir processing on the microstructure of cast A356 aluminum","volume":"433","author":"Ma","year":"2006","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"397","DOI":"10.1016\/j.scriptamat.2006.10.035","article-title":"Enhanced mechanical properties of Mg\u2013Al\u2013Zn cast alloy via friction stir processing","volume":"56","author":"Feng","year":"2007","journal-title":"Scr. Mater."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"982","DOI":"10.1557\/mrs2010.703","article-title":"Metallic composites processed via extreme deformation: Toward the limits of strength in bulk materials","volume":"35","author":"Raabe","year":"2010","journal-title":"MRS Bull."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"2637","DOI":"10.1007\/BF02387731","article-title":"Microstructural changes induced by ternary additions in a hypo-eutectic titanium-silicon alloy","volume":"26","author":"Saha","year":"1991","journal-title":"J. Mater. Sci."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"267","DOI":"10.1080\/21663831.2019.1601644","article-title":"Composition-dependent apparent activation-energy and sluggish grain-growth in high entropy alloys","volume":"7","author":"Gwalani","year":"2019","journal-title":"Mater. Res. Lett."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"448","DOI":"10.1016\/j.actamat.2016.08.081","article-title":"A critical review of high entropy alloys and related concepts","volume":"122","author":"Miracle","year":"2017","journal-title":"Acta Mater."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"6200","DOI":"10.1038\/srep06200","article-title":"A promising new class of high-temperature alloys: Eutectic high-entropy alloys","volume":"4","author":"Lu","year":"2014","journal-title":"Sci. Rep."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"220","DOI":"10.1016\/j.eml.2016.04.013","article-title":"Microstructure and small-scale size effects in plasticity of individual phases of Al 0.7 CoCrFeNi High Entropy alloy","volume":"8","author":"Giwa","year":"2016","journal-title":"Extrem. Mech. Lett."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"6371","DOI":"10.1038\/s41598-019-42870-y","article-title":"Influence of ordered L1 2 precipitation on strain-rate dependent mechanical behavior in a eutectic high entropy alloy","volume":"9","author":"Gwalani","year":"2019","journal-title":"Sci. Rep."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"22","DOI":"10.1063\/1.1707363","article-title":"Effect of strain rate upon plastic flow of steel","volume":"15","author":"Zener","year":"1944","journal-title":"J. Appl. Phys."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1859","DOI":"10.1016\/j.actamat.2003.12.025","article-title":"Adiabatic shear banding in ultrafine-grained Fe processed by severe plastic deformation","volume":"52","author":"Wei","year":"2004","journal-title":"Acta Mater."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1471","DOI":"10.1007\/s11661-005-0239-4","article-title":"Influence of shock prestraining on the formation of shear localization in 304 stainless steel","volume":"36","author":"Xue","year":"2005","journal-title":"Metall. Mater. Trans. A"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.ijimpeng.2012.07.001","article-title":"Annealing effect on the evolution of adiabatic shear band under dynamic shear loading in ultra-fine-grained iron","volume":"50","author":"Yuan","year":"2012","journal-title":"Int. J. Impact Eng."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"703","DOI":"10.1016\/j.ijimpeng.2009.08.002","article-title":"The use of hat-shaped specimens to study the high strain rate shear behaviour of Ti\u20136Al\u20134V","volume":"37","author":"Peirs","year":"2010","journal-title":"Int. J. Impact Eng."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"95","DOI":"10.1016\/j.msea.2017.01.011","article-title":"Adiabatic shear behaviors in rolled and annealed pure titanium subjected to dynamic impact loading","volume":"685","author":"Kuang","year":"2017","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"3183","DOI":"10.1016\/0956-7151(94)90417-0","article-title":"Dynamic recrystallization in high-strain, high-strain-rate plastic deformation of copper","volume":"42","author":"Andrade","year":"1994","journal-title":"Acta Metal. Mater."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"301","DOI":"10.1016\/j.msea.2014.05.053","article-title":"An EBSD investigation on deformation-induced shear bands in a low nickel austenitic stainless steel under controlled shock-loading conditions","volume":"610","author":"Wang","year":"2014","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"203","DOI":"10.1016\/0167-6636(94)90060-4","article-title":"Adiabatic shear failure under biaxial dynamic compression\/shear loading","volume":"17","author":"Meyer","year":"1994","journal-title":"Mech. Mater."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"203","DOI":"10.1016\/j.msea.2018.02.049","article-title":"Mechanical and microstructural properties of 2024-T351 aluminium using a hat-shaped specimen at high strain rates","volume":"720","author":"Edwards","year":"2018","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"363","DOI":"10.1016\/j.msea.2016.03.080","article-title":"Microstructural examination of shear localization during high strain rate deformation of alloy 718","volume":"662","author":"Johansson","year":"2016","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"42742","DOI":"10.1038\/srep42742","article-title":"High-velocity deformation of Al 0.3 CoCrFeNi high-entropy alloy: Remarkable resistance to shear failure","volume":"7","author":"Li","year":"2017","journal-title":"Sci. Rep."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1307","DOI":"10.1016\/S1359-6454(02)00526-8","article-title":"Microstructural evolution in adiabatic shear localization in stainless steel","volume":"51","author":"Meyers","year":"2003","journal-title":"Acta Mater."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"561","DOI":"10.1016\/1359-6454(95)00200-6","article-title":"Adiabatic shear band on the titanium side in the Ti\/mild steel explosive cladding interface","volume":"44","author":"Yang","year":"1996","journal-title":"Acta Mater."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"629","DOI":"10.1016\/j.mechmat.2008.03.002","article-title":"Thermo-mechanical aspects of adiabatic shear failure of AM50 and Ti6Al4V alloys","volume":"40","author":"Rittel","year":"2008","journal-title":"Mech. Mater."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"557","DOI":"10.1179\/mst.1989.5.6.557","article-title":"Width of adiabatic shear bands formed under combined stresses","volume":"5","author":"Dodd","year":"1989","journal-title":"Mater. Sci. Tech."},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Rentenberger, C., Mangler, C., and Karnthaler, H.P. (2008). TEM study of localized deformation-induced disorder in intermetallic alloys of L1 2 structure. EMC 2008 14th European Microscopy Congress 1\u20135 September 2008, Aachen, Germany, Springer.","DOI":"10.1007\/978-3-540-85226-1_241"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"3031","DOI":"10.1016\/j.actamat.2005.03.016","article-title":"On the evolution of a deformation induced nanostructure in a Ni3Al alloy","volume":"53","author":"Rentenberger","year":"2005","journal-title":"Acta Mater."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"2629","DOI":"10.1007\/s11661-007-9271-x","article-title":"Shear localization: A historical overview","volume":"38","author":"Walley","year":"2007","journal-title":"Metall. Mater. Trans. A"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"683","DOI":"10.1016\/0001-6160(81)90151-6","article-title":"The relation between adiabatic shear instability strain and material properties","volume":"29","author":"Staker","year":"1981","journal-title":"Acta Metall."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"2664","DOI":"10.1016\/j.dib.2018.11.111","article-title":"Database on the mechanical properties of high entropy alloys and complex concentrated alloys","volume":"21","author":"Gorsse","year":"2018","journal-title":"Data Brief"}],"container-title":["Entropy"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1099-4300\/22\/4\/431\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T09:17:23Z","timestamp":1760174243000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1099-4300\/22\/4\/431"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,4,10]]},"references-count":30,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2020,4]]}},"alternative-id":["e22040431"],"URL":"https:\/\/doi.org\/10.3390\/e22040431","relation":{"has-preprint":[{"id-type":"doi","id":"10.20944\/preprints202003.0154.v1","asserted-by":"object"}]},"ISSN":["1099-4300"],"issn-type":[{"value":"1099-4300","type":"electronic"}],"subject":[],"published":{"date-parts":[[2020,4,10]]}}}