dc.contributor.author | Guan, Shuai | |
dc.contributor.author | Solberg, Klas | |
dc.contributor.author | Wan, Di | |
dc.contributor.author | Berto, Filippo | |
dc.contributor.author | Welo, Torgeir | |
dc.contributor.author | YUE, TM | |
dc.contributor.author | Chan, KC | |
dc.date.accessioned | 2019-10-15T07:04:02Z | |
dc.date.available | 2019-10-15T07:04:02Z | |
dc.date.created | 2019-09-13T15:31:48Z | |
dc.date.issued | 2019 | |
dc.identifier.issn | 0264-1275 | |
dc.identifier.uri | http://hdl.handle.net/11250/2622119 | |
dc.description.abstract | In this work, the non-equiatomic high entropy alloy AlCoCrFeNiTi0.5 was additively manufactured via the laser engineered net shaping (LENS™) process. Contrary to the columnar grain microstructure commonly observed in previously reported alloys, the as-deposited AlCoCrFeNiTi0.5 specimens exhibit a fully equiaxed grain microstructure in a wide range of temperature gradients G (85 to 1005 K/mm) and solidification velocities V (5 to 20 mm/s). The main microstructural characteristics were found to be B2-structured proeutectic dendrites delineated by lamellar or rod-like B2/A2 eutectic structures. The formation of this microstructural feature can be discussed with the aid of Scheil's solidification model. The proeutectic B2-structured dendrites were frequently found to be fragmented, which may provide profuse effective nucleation sites, and hence promote equiaxed grain formation. Furthermore, we estimated the volume fraction ϕ values of equiaxed crystals at solidification front for various G - V combinations established in this paper, which can provide a theoretical basis for our experimental findings. The current work provides guidelines for producing fully equiaxed alloys by the additive manufacturing (AM) process. | nb_NO |
dc.language.iso | eng | nb_NO |
dc.publisher | Elsevier | nb_NO |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/deed.no | * |
dc.title | Formation of fully equiaxed grain microstructure in additively manufactured AlCoCrFeNiTi0.5 high entropy alloy | nb_NO |
dc.type | Journal article | nb_NO |
dc.type | Peer reviewed | nb_NO |
dc.description.version | publishedVersion | nb_NO |
dc.source.journal | Materials & design | nb_NO |
dc.identifier.doi | 10.1016/j.matdes.2019.108202 | |
dc.identifier.cristin | 1724565 | |
dc.description.localcode | © 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). | nb_NO |
cristin.unitcode | 194,64,92,0 | |
cristin.unitname | Institutt for maskinteknikk og produksjon | |
cristin.ispublished | true | |
cristin.qualitycode | 1 | |