Relationship between the shear modulus and volume relaxation in high-entropy metallic glasses: experiment and physical origin
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2024
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866911979751342080 |
|---|---|
| author | Khmyrov, R. S. Makarov, A. S. Qiao, J. C. Kobelev, N. P. Khonik, V. A. |
| author_facet | Khmyrov, R. S. Makarov, A. S. Qiao, J. C. Kobelev, N. P. Khonik, V. A. |
| contents | We performed parallel measurements of the high-frequency shear modulus $G$ and relative volume $ΔV/V$ for high-entropy Ti$_{20}$Zr$_{20}$Hf$_{20}$Be$_{20}$Cu$_{20}$ and Ti$_{20}$Zr$_{20}$Hf$_{20}$Be$_{20}$Ni$_{20}$ glasses upon heating from room temperature up to the complete crystallization. The changes of these properties due to structural relaxation both below and above the glass transition temperature are singled out. It is shown that these changes for both initial and preannealed samples can be well described within the framework of the Interstitialcy theory. It is found that the whole relaxation process in the full temperature range of the experiments for both samples' states can be characterized by a single dimensionless temperature-independent parameter $K_i=dln\;G/dln\;V$, which equals to -44 and -53 for the above glasses, respectively, and strongly points at interstitial-type defects as a source of relaxation. We also show that the relaxation of the relative volume linearly depends on the defect concentration. This behavior can be described by another dimensionless temperature-independent parameter, which is related with the relaxation volume of defects. Possible contribution of vacancy-like defects into the relaxation is discussed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_03207 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Relationship between the shear modulus and volume relaxation in high-entropy metallic glasses: experiment and physical origin Khmyrov, R. S. Makarov, A. S. Qiao, J. C. Kobelev, N. P. Khonik, V. A. Disordered Systems and Neural Networks Materials Science We performed parallel measurements of the high-frequency shear modulus $G$ and relative volume $ΔV/V$ for high-entropy Ti$_{20}$Zr$_{20}$Hf$_{20}$Be$_{20}$Cu$_{20}$ and Ti$_{20}$Zr$_{20}$Hf$_{20}$Be$_{20}$Ni$_{20}$ glasses upon heating from room temperature up to the complete crystallization. The changes of these properties due to structural relaxation both below and above the glass transition temperature are singled out. It is shown that these changes for both initial and preannealed samples can be well described within the framework of the Interstitialcy theory. It is found that the whole relaxation process in the full temperature range of the experiments for both samples' states can be characterized by a single dimensionless temperature-independent parameter $K_i=dln\;G/dln\;V$, which equals to -44 and -53 for the above glasses, respectively, and strongly points at interstitial-type defects as a source of relaxation. We also show that the relaxation of the relative volume linearly depends on the defect concentration. This behavior can be described by another dimensionless temperature-independent parameter, which is related with the relaxation volume of defects. Possible contribution of vacancy-like defects into the relaxation is discussed. |
| title | Relationship between the shear modulus and volume relaxation in high-entropy metallic glasses: experiment and physical origin |
| topic | Disordered Systems and Neural Networks Materials Science |
| url | https://arxiv.org/abs/2408.03207 |