Analysis of the anelastic deformation of high-entropy Pd20Pt20Cu20Ni20P20 metallic glass under stress relaxation and recovery
The anelastic deformation behavior of Pd20Pt20Cu20Ni20 P20 high-entropy metallic glass was probed by monitoring the stress relaxation and recovery processes. The stress relaxation under consecutive strain steps can be described by the Kohlrausch-Williams-Watts (KWW) function. In addition, considerin...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/372493 |
| Acceso en línea: | https://hdl.handle.net/2117/372493 https://dx.doi.org/10.1016/j.jmst.2021.07.052 |
| Access Level: | acceso abierto |
| Palabra clave: | Metallic glasses Stress relaxation (Physics) High-entropy metallic glass Stress relaxation Anelastic deformation Flow defects Free-volume zones Vidres metàl·lics Àrees temàtiques de la UPC::Física |
| Sumario: | The anelastic deformation behavior of Pd20Pt20Cu20Ni20 P20 high-entropy metallic glass was probed by monitoring the stress relaxation and recovery processes. The stress relaxation under consecutive strain steps can be described by the Kohlrausch-Williams-Watts (KWW) function. In addition, considering a hi- erarchy of relaxation processes related to the structural heterogeneity, a constitutive model is proposed in order to describe the whole process of stress relaxation and determine the contribution of different time scales. Moreover, a crossover from stochastic activation to percolation of flow defects with the ultimate strain can be observed during stress relaxation process. The anelastic recovery process after a strain step is studied as a function of the initial strain level and characterized by means of a direct spectrum analy- sis. The peaks in the recovery time-spectra revealed the evolution of flow defects in Pd20Pt20Cu20Ni20 P20 high-entropy metallic glass. The understanding of the atomic free-volume zones effect and the anelastic deformation provides important insight into how atomic structural features affect the deformation be- havior of high-entropy metallic glasses, and may provide a new avenue into the improvement of their mechanical properties. |
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