Temperature and Orientation Dependence of the Mechanical Properties of Al0.3CoCrFeNi High-Entropy Alloy Single Crystals Hardened by Non-Coherent β- Phase Particles
| Autor: | Irina Bessonova, A. A. Saraeva, Z. V. Pobedennaya, Irina Kireeva, Yu. I. Chumlyakov, A.V. Vyrodova, I. V. Kuksgauzen, D. A. Kuksgauzen |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics 010308 nuclear & particles physics Alloy Crystal orientation General Physics and Astronomy Slip (materials science) Atmospheric temperature range Plasticity Strain hardening exponent engineering.material 01 natural sciences 0103 physical sciences engineering Non coherent Crystal twinning |
| Zdroj: | Russian Physics Journal. 63:134-141 |
| ISSN: | 1573-9228 1064-8887 |
| DOI: | 10.1007/s11182-020-02012-8 |
| Popis: | Aging of the Al0.3CoCrFeNi high-entropy alloy single crystals for 50 h at a temperature of 973 K leads to the precipitation of non-coherent non-equiaxed β-phase particles with B2-type ordering, average length l =250–350 nm, width d = 30–45 nm, and interparticle distance L = 500–750 nm. It is shown that the interaction of slip dislocations with β-phase particles is realized by the rounding mechanism. The β-phase particles increase critical shear stresses τcr by 30–50 MPa in the temperature range of 77–973 K compared to the quenched single crystals. The deformation of [$$ \overline{1}11 $$] - and [001]-oriented single crystals in the temperature range of 77–973 K is realized by slip, and τcr are independent of the crystal orientation. It is shown that the strain hardening coefficient Θ = dσ/de and the plasticity epl during tensile strain in [$$ \overline{1}11 $$]- and [001]-oriented single crystals, on the contrary, depend on the crystal orientation. The maximum value of Θ = dσ/de = 3400 MPa and the minimum value of epl = 8% are observed in [$$ \overline{1}11 $$]-oriented single crystals at 77 K. Twinning in [$$ \overline{1}11 $$]- oriented single crystals with the β-phase particles was not detected at tension before failure at 77 and 296 K. |
| Databáze: | OpenAIRE |
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