Elastic moduli and thermal expansion coefficients of medium-entropy subsystems of the CrMnFeCoNi high-entropy alloy

JOURNAL OF ALLOYS AND COMPOUNDS

卷:746

Article

Laplanche, G.¹  Gadaud, P.²  Baersch, C.³  Demtroeder, K.³  Reinhart, C.¹  Schreuer, J.³  George, E. P.^4,5 

[1] Ruhr Univ Bochum, Inst Werkstoffe, D-44780 Bochum, Germany

[2] Univ Poitiers, CNRS, Dept Phys & Mecan Mat, ISAE,ENSMA,UPR 3346,Inst P, 1 Ave Clement Ader, F-86961 Futuroscope, France

[3] Ruhr Univ Bochum, Inst Geol Mineral & Geophys, D-44780 Bochum, Germany

[4] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[5] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

关键词: High entropy alloys;    CoCrFeMnNi;    Microstructure;    Texture;    Thermal expansion coefficient;    Elastic constants;   

DOI  :  10.1016/j.jallcom.2018.02.251

来源: Elsevier

【 摘 要 】

Elastic moduli of a set of equiatomic alloys (CrFeCoNi, CrCoNi, CrFeNi, FeCoNi, MnCoNi, MnFeNi, and CoNi), which are medium-entropy subsystems of the CrMnFeCoNi high-entropy alloy were determined as a function of temperature over the range 293 K-1000 K. Thermal expansion coefficients were determined for these alloys over the temperature range 100 K-673 K. All alloys were single-phase and had the face-centered cubic (FCC) crystal structure, except CrFeNi which is a two-phase alloy containing a small amount of body-centered cubic (BCC) precipitates in a FCC matrix. The temperature dependences of thermal expansion coefficients and elastic moduli obtained here are useful for quantifying fundamental aspects such as solid solution strengthening, and for structural analysis/design. Using the above results, the yield strengths reported in literature for these alloys were normalized by their shear moduli to reveal the influence of shear modulus on solid solution strengthening. (c) 2018 The Author(s). Published by Elsevier B.V.

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