Mechanical behavior and thermal activation analysis of HfNbTaTiZr body-centered cubic high-entropy alloy during tensile deformation at 77 K
| Autor: | Sergey Zherebtsov, Nikita Stepanov, Rajeshwar R. Eleti |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Alloy Metals and Alloys Nucleation Thermodynamics 02 engineering and technology Slip (materials science) engineering.material Cubic crystal system Plasticity 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Mechanics of Materials 0103 physical sciences Ultimate tensile strength engineering General Materials Science Deformation (engineering) Dislocation 0210 nano-technology |
| Zdroj: | Scripta Materialia. 188:118-123 |
| ISSN: | 1359-6462 |
| Popis: | Plastic deformation of HfNbTaTiZr body-centered cubic high-entropy alloy (BCC HEA) was investigated at 77 K. Tensile stress-strain curves showed strong temperature dependence of yield strength. Characteristics of dislocation slip at 77 K was analyzed using slip traces which confirmed active slip on {112} planes. The apparent activation volume (V*) suggested thermally activated kink/kink-pair nucleation at 77 K (V*~7b3). V* values of BCC HEA and pure Nb were nearly same at 77 K. Low-temperature plasticity of the BCC HEA showed characteristics of pure BCC metals, suggesting chemical-complexity of HEAs may not alter the Peierls potential of a/2 screw dislocations. |
| Databáze: | OpenAIRE |
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