Structural investigation of the stability in temperature of some high entropy/multi major components alloys as a function of their electronic structure

JOURNAL OF ALLOYS AND COMPOUNDS

卷:837

Article

Calvo-Dahlborg, M.^1,2  Dahlborg, U.^1,2  Cornide, J.^1,6  Mehraban, S.²  Leong, Z.³  Hansen, T. C.⁴  Wunderlich, R. K.^5,7  Goodall, R.³  Lavery, N. P.²  Brown, S. G. R.² 

[1] Univ Rouen Normandie, GPM, CNRS, UMR6634, Campus Madrillet,BP12, F-76801 St Etienne Du Rouvray, France

[2] Swansea Univ, Coll Engn, Bay Campus,Fabian Way, Swansea SA1 8EN, W Glam, Wales

[3] Univ Sheffield, Dept Mat Sci & Engn, Sir Robert Hadfield Bldg,Mappin St, Sheffield S1 3JD, S Yorkshire, England

[4] Inst Laue Langevin, 71 Ave Martyrs, F-38042 Grenoble 9, France

[5] Univ Ulm, Inst Funkt Nanosyst, Albert Einstein Allee 47, D-89081 Ulm, Germany

[6] Univ Carlos III Madrid, IAAB, Dept Mat Sci & Engn, Avda Univ 30, Leganes 28911, Spain

[7] Met Europe gGmbH, Magirus Deutz Str 12, D-89077 Ulm, Germany

关键词: High entropy alloys;    Multicomponent;    Structure;    Phases;    Calorimetry;    e/a;   

DOI  :  10.1016/j.jallcom.2020.155496

来源: Elsevier

【 摘 要 】

High Entropy Alloys (HEA) can be classified in three domains according to their e/a and r values, with e/a, the number of itinerant valence electrons and r the average radius for a 12 nearest atoms neighborhood. The phase composition, thermal stability and possible phase transformations of a series of HEA alloys, CoCrzFeNi-XY (with X and Y = Al, Cu, Pd, Ru, Ti and z = 0 or 1), selected according to their e/a ratio were investigated in cast conditions (TO), after 3 h homogenization at 1100 degrees C (TI) and after 3 h annealing at 700 degrees C (T3). When observing the behavior of the different Domains of HEAs as classified by electronic structure it is observed that for the alloys from Domain I which contain fcc structures, the microstructure transforms from multi-to almost single-phase under homogenization (T1). In Domain III alloys containing cubic (bcc and/or B2) structures, very small multi-structural changes are observed. Alloys in Domain II have a mixed structure, i.e. several different structures in the diffraction pattern, which changes during heat treatments. (C) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

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