Spatio-Temporal Dynamics of Jerky Flow in High-Entropy Alloy at Extremely Low Temperature
| Autor: | Ritupan Sarmah, Chunsheng Lu, G. Ananthakrishna, Yan Chen, Zhoucan Xie, Z. Pu, Lanhong Dai |
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| Rok vydání: | 2019 |
| Předmět: |
Correlation dimension
Inertial frame of reference Materials science Flow (psychology) Alloy 02 engineering and technology Lyapunov exponent engineering.material Plasticity 01 natural sciences Instability Physics::Fluid Dynamics symbols.namesake 0103 physical sciences Cryogenic temperature 010302 applied physics Dynamics (mechanics) Mechanics Liquid nitrogen 021001 nanoscience & nanotechnology Condensed Matter Physics Deborah number Flow (mathematics) Chemical physics engineering symbols Dislocation 0210 nano-technology |
| Zdroj: | SSRN Electronic Journal. |
| ISSN: | 1556-5068 |
| DOI: | 10.2139/ssrn.3474451 |
| Popis: | Despite a large body of literature, mechanisms contributing to low temperature jerky flow remain controversial. Here, we report a cross over from a smooth at room and liquid nitrogen temperatures to serrated plastic flow at 4.2 K in high-entropy CrMnFeCoNi alloy. We show that the jerky flow results from an interaction between dislocation inertial motion with Lomer-Cottrell locks. The instability is shown to result from a competition between the inertial and viscous time scales characterized by a Deborah number. A dynamical analysis shows that jerky flow is chaotic characterized by a finite correlation dimension and a positive Lyapunov exponent. |
| Databáze: | OpenAIRE |
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