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タイトル: | Simultaneous Strength-Ductility Enhancement of a Nano-Lamellar AlCoCrFeNi2.1 Eutectic High Entropy Alloy by Cryo-Rolling and Annealing |
著者: | Bhattacharjee, T. Wani, I. S. Sheikh, S. Clark, I. T. Okawa, T. Guo, S. Bhattacharjee, P. P. Tsuji, N. |
著者名の別形: | 大川, 登志郎 辻, 伸泰 |
キーワード: | Materials science Mechanical properties |
発行日: | 19-Feb-2018 |
出版者: | Springer Nature |
誌名: | Scientific Reports |
巻: | 8 |
論文番号: | 3276 |
抄録: | Nano-lamellar (L12 + B2) AlCoCrFeNi2.1 eutectic high entropy alloy (EHEA) was processed by cryo-rolling and annealing. The EHEA developed a novel hierarchical microstructure featured by fine lamellar regions consisting of FCC lamellae filled with ultrafine FCC grains (average size ~200–250 nm) and B2 lamellae, and coarse non-lamellar regions consisting of ultrafine FCC (average size ~200–250 nm), few coarse recrystallized FCC grains and rather coarse unrecrystallized B2 phase (~2.5 µm). This complex and hierarchical microstructure originated from differences in strain-partitioning amongst the constituent phases, affecting the driving force for recrystallization. The hierarchical microstructure of the cryo-rolled and annealed material resulted in simultaneous enhancement in strength (Yield Strength/YS: 1437 ± 26 MPa, Ultimate Tensile Strength/UTS: 1562 ± 33 MPa) and ductility (elongation to failure/ef ~ 14 ± 1%) as compared to the as-cast as well as cold-rolled and annealed materials. The present study for the first time demonstrated that cryo-deformation and annealing could be a novel microstructural design strategy for overcoming strength-ductility trade off in multiphase high entropy alloys. |
記述: | 高強度・高延性を有するハイ・エントロピー合金の作製 --ヘテロ・ナノ組織制御による優れた力学特性の実現--. 京都大学プレスリリース. 2018-02-19. |
著作権等: | © The Author(s) 2018. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
URI: | http://hdl.handle.net/2433/229145 |
DOI(出版社版): | 10.1038/s41598-018-21385-y |
PubMed ID: | 29459746 |
関連リンク: | http://www.kyoto-u.ac.jp/ja/research/research_results/2017/180219_1.html |
出現コレクション: | 学術雑誌掲載論文等 |
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