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Title: Atomic displacement in the CrMnFeCoNi high-entropy alloy – A scaling factor to predict solid solution strengthening
Authors: Okamoto, Norihiko L.
Yuge, Koretaka kyouindb researcher_resolver
Tanaka, Katsushi
Inui, Haruyuki
George, Easo P.
Author's alias: 乾, 晴行
弓削, 是貴
Issue Date: 1-Dec-2016
Publisher: American Institute of Physics Inc.
Journal title: AIP Advances
Volume: 6
Issue: 12
Thesis number: 125008
Abstract: 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.
Rights: © 2016 Author(s). This article is distributed under a Creative Commons Attribution (CC BY) License.
URI: http://hdl.handle.net/2433/218241
DOI(Published Version): 10.1063/1.4971371
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