Twinning in [001]-oriented single crystals of CoCrFeMnNi high-entropy alloy at tensile deformation
| Autor: | Ibrahim Karaman, A.V. Vyrodova, Irina Kireeva, Yu. I. Chumlyakov, Z. V. Pobedennaya |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Alloy 02 engineering and technology Slip (materials science) engineering.material Strain hardening exponent 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Deformation mechanism Mechanics of Materials Stacking-fault energy Critical resolved shear stress 0103 physical sciences Ultimate tensile strength engineering General Materials Science Composite material 0210 nano-technology Crystal twinning |
| Zdroj: | Materials Science and Engineering: A. 713:253-259 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/j.msea.2017.12.059 |
| Popis: | This paper presents research about the tensile deformation behaviour and deformation mechanisms (slip and twinning) in single crystals of the equiatomic Co20Cr20Fe20Mn20Ni20 (at%) high-entropy alloy (HEA) oriented along the [001] direction in the temperature range T = 77–573 K. Classical studies on single crystals of pure metals and their substitution alloys with the face-centered cubic (FCC) structure, with a low stacking fault energy, have shown that deformation twinning in single crystals oriented along the [001] direction does not develop at tensile deformation. In the present paper, extrinsic stacking faults and deformation twinning in the [001]-oriented single crystals of the equiatomic Co20Cr20Fe20Mn20Ni20 HEA were detected under tensile loading at the temperature of liquid nitrogen after a strain of 5%. The critical resolved shear stress for twinning was determined as τ cr tw =210 ± 10 MPa. Deformation twinning in the [001]-oriented single crystals leads to an increase in the strain hardening coefficient in comparison with the slip deformation in these crystals at T > 77 K. |
| Databáze: | OpenAIRE |
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