Experimental observation and theoretical modeling of multi-stage power-law creep in metallic glass
Power-law creep, where the creep strain rate follows a power-law relationship with time, is ubiquitous in crystalline materials. However, this behavior typically exhibits multi-stage characteristics in amorphous materials due to the intrinsic structural and dynamic heterogeneity. In this study, we s...
| Autores: | , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| 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:2117/450026 |
| Acceso en línea: | https://hdl.handle.net/2117/450026 https://dx.doi.org/10.1007/s00707-025-04420-8 |
| Access Level: | acceso embargado |
| Palabra clave: | Metallic glass Power-law creep Shear microdomains Structural relaxation Quasi-point defect Àrees temàtiques de la UPC::Enginyeria dels materials |
| Sumario: | Power-law creep, where the creep strain rate follows a power-law relationship with time, is ubiquitous in crystalline materials. However, this behavior typically exhibits multi-stage characteristics in amorphous materials due to the intrinsic structural and dynamic heterogeneity. In this study, we systematically performed high-temperature creep experiments on a Pd20Pt20Cu20Ni20P20 metallic glass. It is found each stage in multi-stage creep is governed by different deformation mechanisms, influenced by factors such as temperature, stress, and structural relaxation. Experimental results indicate that increasing temperature causes the power-law creep behavior to change from two stages to three stages, while increasing stress does not alter this behavior. After cyclic creep, the power-law creep behavior reverts from three stages to two stages. Based on the quasi-point defect theory, we propose a creep constitutive model that includes the contribution of structural relaxation to creep behavior in the generic metastable materials. Theoretical modelings show creep response is primarily driven by two deformation mechanisms: the activation of inherent deformation units (shear microdomains), which dominate the early stage of creep; and the mechanism related to structural relaxation, with atomic correlations significantly influenced by temperature and aging conditions. The constitutive model reveals the factors influencing the power-law creep and clarifies the intrinsic mechanism underlying the transition from two stages to three stages. These mechanisms align with the thermal and mechanical effects observed in the experiments. |
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