Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy Alloy
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 textur...
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MDPI AG
2020-04-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/10/4/336 |
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| author | Werner Skrotzki Aurimas Pukenas Eva Odor Bertalan Joni Tamas Ungar Bernhard Völker Anton Hohenwarter Reinhard Pippan Easo P. George |
| author_facet | Werner Skrotzki Aurimas Pukenas Eva Odor Bertalan Joni Tamas Ungar Bernhard Völker Anton Hohenwarter Reinhard Pippan Easo P. George |
| author_sort | Werner Skrotzki |
| collection | DOAJ |
| description | 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 10<sup>16</sup> m<sup>−2</sup> 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. |
| first_indexed | 2024-03-10T20:15:17Z |
| format | Article |
| id | doaj.art-45030620a1a74c5b87c7b9f49cd9c9d4 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T20:15:17Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-45030620a1a74c5b87c7b9f49cd9c9d42023-11-19T22:35:07ZengMDPI AGCrystals2073-43522020-04-0110433610.3390/cryst10040336Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy AlloyWerner Skrotzki0Aurimas Pukenas1Eva Odor2Bertalan Joni3Tamas Ungar4Bernhard Völker5Anton Hohenwarter6Reinhard Pippan7Easo P. George8Institute of Solid State and Materials Physics, Technische Universität Dresden, D-01062 Dresden, GermanyInstitute of Solid State and Materials Physics, Technische Universität Dresden, D-01062 Dresden, GermanyDepartment of Materials Physics, Eötvös University, H-1117 Budapest, HungaryDepartment of Materials Physics, Eötvös University, H-1117 Budapest, HungaryDepartment of Materials Physics, Eötvös University, H-1117 Budapest, HungaryDepartment of Materials Science, Chair of Materials Physics, Montanuniversität Leoben, A-8700 Leoben, AustriaDepartment of Materials Science, Chair of Materials Physics, Montanuniversität Leoben, A-8700 Leoben, AustriaErich Schmid Institute of Materials Science, Austrian Academy of Sciences, 8700 Leoben, AustriaMaterials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USAThe 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 10<sup>16</sup> m<sup>−2</sup> 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.https://www.mdpi.com/2073-4352/10/4/336high-entropy alloyhigh-pressure torsionmicrostructuretexturephase transformationstrength |
| spellingShingle | Werner Skrotzki Aurimas Pukenas Eva Odor Bertalan Joni Tamas Ungar Bernhard Völker Anton Hohenwarter Reinhard Pippan Easo P. George Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy Alloy Crystals high-entropy alloy high-pressure torsion microstructure texture phase transformation strength |
| title | Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy Alloy |
| title_full | Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy Alloy |
| title_fullStr | Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy Alloy |
| title_full_unstemmed | Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy Alloy |
| title_short | Microstructure, Texture, and Strength Development during High-Pressure Torsion of CrMnFeCoNi High-Entropy Alloy |
| title_sort | microstructure texture and strength development during high pressure torsion of crmnfeconi high entropy alloy |
| topic | high-entropy alloy high-pressure torsion microstructure texture phase transformation strength |
| url | https://www.mdpi.com/2073-4352/10/4/336 |
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