Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy Alloy

Skrotzki, Werner; Pukenas, Aurimas; Odor, Eva; Joni, Bertalan; Ungar, Tamas; Völker, Bernhard; Hohenwarter, Anton; Pippan, Reinhard; George, Easo P.

doi:10.3390/cryst10040336

Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy Alloy

Journal Article · Fri Apr 24 00:00:00 EDT 2020 · Crystals

DOI:https://doi.org/10.3390/cryst10040336· OSTI ID:2377790

Skrotzki, Werner; Pukenas, Aurimas; Odor, Eva; Joni, Bertalan; Ungar, Tamas; Völker, Bernhard; Hohenwarter, Anton; Pippan, Reinhard; George, Easo P.

The equiatomic face-centered cubic high-entropy alloy CrMnFeCoNi was severely deformed at room and liquid nitrogen temperature by high-pressure torsion up to shear strains of about 170. Its microstructure was analyzed by X-ray line profile analysis and transmission electron microscopy and its texture by X-ray microdiffraction. Microhardness measurements, after severe plastic deformation, were done at room temperature. It is shown that at a shear strain of about 20, a steady state grain size of 24 nm, and a dislocation density of the order of 1016 m−2 is reached. The dislocations are mainly screw-type with low dipole character. Mechanical twinning at room temperature is replaced by a martensitic phase transformation at 77 K. The texture developed at room temperature is typical for sheared face-centered cubic nanocrystalline metals, but it is extremely weak and becomes almost random after high-pressure torsion at 77 K. The strength of the nanocrystalline material produced by high-pressure torsion at 77 K is lower than that produced at room temperature. The results are discussed in terms of different mechanisms of deformation, including dislocation generation and propagation, twinning, grain boundary sliding, and phase transformation.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Australian Science Fund; European Research Council (ERC); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2377790

Alternate ID(s):: OSTI ID: 1616814

Journal Information:: Crystals, Journal Name: Crystals Journal Issue: 4 Vol. 10; ISSN CRYSBC; ISSN 2073-4352

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Germany

Language:: English

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