| Texto completo | |
| Autor(es): |
Alvarez-Donado, Rend
[1]
;
Antonelli, Alex
Número total de Autores: 2
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Campinas, UNICAMP, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil
Número total de Afiliações: 1
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW RESEARCH; v. 2, n. 1 FEB 25 2020. |
| Citações Web of Science: | 0 |
| Resumo | |
We apply an efficient methodology to separate vibrational and configurational entropies in bulk metallic glasses by means of molecular dynamics simulation based on a combination of nonequilibrium adiabatic switching and reversible scaling methods. This approach involves calculating the vibrational free energy using the Einstein crystal as a reference for the solid phase and the recently proposed Uhlenbeck-Ford model for the fluid phase. This methodology has the advantage that it does not require a crystalline solid phase for separating the entropies. Therefore, in principle, it is applicable to any material, regardless of whether or not it has a crystalline phase. Using this methodology, we separate the vibrational and configurational entropies of two metallic glasses with different fragilities at zero external pressure, namely, Cu50Zr50 and Cu46Zr46Al8. We find that the results for the former alloy are in quite reasonable agreement with recent experimental work by Smith et al. {[}Nat. Phys. 13, 900 (2017)]. We also find the configurational entropy of the glass containing Al to be 70% larger than that of the other glass. Our results suggest that although other factors may be at play, the configurational entropy can be used to investigate the effect of the addition of a minor-alloying element on the glass-forming ability of bulk metallic glasses. (AU) | |
| Processo FAPESP: | 13/08293-7 - CECC - Centro de Engenharia e Ciências Computacionais |
| Beneficiário: | Munir Salomao Skaf |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |
| Processo FAPESP: | 16/23891-6 - Modelagem computacional da matéria condensada |
| Beneficiário: | Alex Antonelli |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 10/16970-0 - Modelagem computacional da matéria condensada: uma abordagem em múltiplas escalas |
| Beneficiário: | Alex Antonelli |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |