Agradecimentos: We gratefully acknowledge financial support from the Brazilian agencies CNPq, CAPES, under the Project PROEX-0487, and FAPESP under Grants No. 2010/16970-0, No. 2013/08293-7, and No. 2016/23891-6. The calculations were performed at CCJDR-IFGW-UNICAMP and at CENAPAD-SP in Brazil

Abstract: The fragile-to-strong crossover seems to be a general feature of metallic glass-forming liquids. Here, we study the behavior of shear viscosity, diffusion coefficient, and vibrational density of states for CuxZrxAl100-2x, alloy through molecular dynamics simulations. The results reveal...

Abstract: The fragile-to-strong crossover seems to be a general feature of metallic glass-forming liquids. Here, we study the behavior of shear viscosity, diffusion coefficient, and vibrational density of states for CuxZrxAl100-2x, alloy through molecular dynamics simulations. The results reveal that the fragile-to-strong temperature (T-fs) and the glass transition temperature (T-g) increase as the aluminum content becomes larger. The inverse of the diffusion coefficient as a function of temperature exhibits a dynamical crossover in the vicinity of T-g, at a much lower temperature than that predicted by nearly all previous studies. At the temperature in which the dynamical crossover occurs determined by the inverse of the diffusion coefficient, we found an excess of vibrational states at low frequencies, resembling a pronounced peak in the reduced vibrational density of states characteristic of a strong liquid. Finally, the behavior of the shear viscosity as a function of reduced temperature (T-g/T) also shows that, aside from the fragile-to-strong crossover nearby T-g, another dynamical crossover is present near the onset of the supercooled regime

FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP

2010/16970-0; 2013/08293-7; 2016/23891-6

COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES

PROEX-0487

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ

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