Structural Features and Solid-Solution Hardening of High-Entropy CrMnFeCoNi Alloy

The phase composition, microstructure, and mechanical properties of the single-phase CrMnFeCoNi high-entropy alloy with fcc lattice produced by argon-arc vacuum melting are studied. The alloy solid-solution hardening mechanism is analyzed. The abnormally high athermic solid-solution hardening of the...

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Bibliographic Details
Published in:Powder metallurgy and metal ceramics 2016-07, Vol.55 (3-4), p.225-235
Main Authors: Firstov, S. A., Rogul’, T. G., Krapivka, N. A., Ponomarev, S. S., Kovylyaev, V. V., Danilenko, N. I., Bega, N. D., Danilenko, V. I., Chugunova, S. I.
Format: Article
Language:English
Subjects:
Activation energy
Alloys
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composites
Crystal lattices
Degassing of metals
Dislocations
Face centered cubic lattice
Glass
Hardening
Lattices
Materials Science
Mathematical analysis
Mechanical properties
Metallic Materials
Metals
Natural Materials
Powder metallurgy
Specialty metals industry
Structural Materials Research
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Summary:The phase composition, microstructure, and mechanical properties of the single-phase CrMnFeCoNi high-entropy alloy with fcc lattice produced by argon-arc vacuum melting are studied. The alloy solid-solution hardening mechanism is analyzed. The abnormally high athermic solid-solution hardening of the alloy is due to variation in the Burgers vector along the dislocation line and a vector component perpendicular to the slip plane. The activation energy of dislocation movement and activation volume are calculated. The activation energy of dislocation movement is close to the activation energy of pure metals with fcc lattices, and the activation volume is significantly lower compared to that of pure metals because picosized distortions grow in the crystal lattice of the multicomponent alloy. The ratio of hardness and yield stress for this alloy is examined.
ISSN:1068-1302
1573-9066
DOI:10.1007/s11106-016-9797-9