TY - JOUR
T1 - Atomic displacement in the CrMnFeCoNi high-entropy alloy - A scaling factor to predict solid solution strengthening
AU - Okamoto, Norihiko L.
AU - Yuge, Koretaka
AU - Tanaka, Katsushi
AU - Inui, Haruyuki
AU - George, Easo P.
N1 - Funding Information:
The study was conceived during a short-term research stay by E.P.G. in the group of H.I. at Kyoto University sponsored by an invitation fellowship of JSPS; the HEA was fabricated while E.P.G. was at the Oak Ridge National Laboratory funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. E.P.G. acknowledges DFG funding in Germany through project GE 2736/1-1. This work was also supported by JSPS KAKENHI grant numbers 15H02300, 16K14373 and 16K14415, and the Elements Strategy Initiative for Structural Materials (ESISM) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan, and in part by Advanced Low Carbon Technology Research and Development Program (ALCA) from the Japan Science and Technology Agency (JST). The synchrotron radiation experiments were performed at the BL02B1 of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Nos. 2014B1228, 2014B1553, 2015A1468 & 2016B1096). We wish to thank Dr K. Sugimoto and Dr N. Yasuda for their assistance at the BL02B1 of SPring-8
Publisher Copyright:
© 2016 Author(s).
PY - 2016/12/1
Y1 - 2016/12/1
N2 - 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.
AB - 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.
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U2 - 10.1063/1.4971371
DO - 10.1063/1.4971371
M3 - Article
AN - SCOPUS:85002984029
SN - 2158-3226
VL - 6
JO - AIP Advances
JF - AIP Advances
IS - 12
M1 - 125008
ER -