Microstructure and texture evolution during severe plastic deformation of CrMnFeCoNi high-entropy alloy

7th International Conference on Nanomaterials by Severe Plastic Deformation

Skrotzki, W.^1 ; Pukenas, A.^1 ; Joni, B.^2 ; Odor, E.^2 ; Ungar, T.^2,3 ; Hohenwarter, A.^4 ; Pippan, R.^4 ; George, E.P.^5,6

Institut für Strukturphysik, Technische Universität Dresden, Dresden

D-01062, Germany^1

Department of Materials Physics, Eötvös University, Budapest

H-1117, Hungary^2

Materials Performance Centre, School of Materials, University of Manchester, Manchester

M13 9PL, United Kingdom^3

Department of Materials Physics, Montanuniversität Leoben, Leoben

A-8700, Austria^4

Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge

TN

37831, United States^5

Department of Materials Science and Engineering, University of Tennessee, Knoxville

TN

37996, United States^6

关键词: Dislocation densities;    Face-centred cubic;    High entropy alloys;    High pressure torsions;    Severe plastic deformations;    Texture evolutions;    X ray microdiffraction;    X-ray line profile analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/194/1/012028/pdf
DOI  :  10.1088/1757-899X/194/1/012028

来源: IOP

【 摘 要 】

An equiatomic high-entropy alloy CrMnFeCoNi was severely deformed at room temperature by high pressure torsion up to shear strains of about 170. Its microstructure and texture were analyzed by X-ray diffraction (X-ray line profile analysis and X-ray microdiffraction, respectively). It is shown that at a shear strain of about 20 a steady state domain/grain size of 24 nm and a dislocation density of 3 × 1016m-2is reached, while the twin density goes over a maximum of 2% at this strain. The texture developed is typical for sheared face-centred cubic metals, but it is extremely weak. The results are discussed in terms of the mechanisms of deformation, including dislocation slip, twinning and grain boundary sliding.