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タイトル: Atomic displacement in the CrMnFeCoNi high-entropy alloy – A scaling factor to predict solid solution strengthening
著者: Okamoto, Norihiko L.
Yuge, Koretaka  kyouindb  KAKEN_id
Tanaka, Katsushi
Inui, Haruyuki
George, Easo P.
著者名の別形: 乾, 晴行
弓削, 是貴
発行日: 1-Dec-2016
出版者: American Institute of Physics Inc.
誌名: AIP Advances
巻: 6
号: 12
論文番号: 125008
抄録: Although metals strengthened by alloying have been used for millennia, models to quantify solid solution strengthening (SSS) were first proposed scarcely seventy years ago. Early models could predict the strengths of only simple alloys such as dilute binaries and not those of compositionally complex alloys because of the difficulty of calculating dislocation-solute interaction energies. Recently, models and theories of SSS have been proposed to tackle complex high-entropy alloys (HEAs). Here we show that the strength at 0 K of a prototypical HEA, CrMnFeCoNi, can be scaled and predicted using the root-mean-square atomic displacement, which can be deduced from X-ray diffraction and first-principles calculations as the isotropic atomic displacement parameter, that is, the average displacements of the constituent atoms from regular lattice positions. We show that our approach can be applied successfully to rationalize SSS in FeCoNi, MnFeCoNi, MnCoNi, MnFeNi, CrCoNi, CrFeCoNi, and CrMnCoNi, which are all medium-entropy subsets of the CrMnFeCoNi HEA.
著作権等: © 2016 Author(s). This article is distributed under a Creative Commons Attribution (CC BY) License.
URI: http://hdl.handle.net/2433/218241
DOI(出版社版): 10.1063/1.4971371
出現コレクション:学術雑誌掲載論文等

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