Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 892, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.162220
Keywords
High entropy bulk metallic glass; Crystallization kinetics; Thermal stability; Fragility; Structural relaxation; Free volume
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A new non-equiatomic high entropy bulk metallic glass (HEBMG) was developed in this study based on the Cu47Zr47Al6 prototype BMG. Kinetic studies were performed comparing the thermal properties of the BMG and HEBMG, showing differences in activation energies and structural relaxation enthalpy. Compression tests confirmed a 58% improvement in plastic strain for the HEBMG compared to the BMG.
In this study, new non-equiatomic high entropy bulk metallic glass (HEBMG) Zr33Hf8Ti6Cu32Ni10Co5Al6 was developed according to the Cu47Zr47Al6 prototype BMG. Kinetic studies were performed with non-isothermal DSC for the BMG and the HEBMG, and their thermal properties were compared. Calculation of activation energies by different methods indicated that Eg is higher for the HEBMG than the BMG, while Ep is lower for the HEBMG than the BMG, and Ex is similar for both alloys. The values of structural relaxation enthalpy for the BMG and the HEBMG were 4.95 J/g and 8.19 J/g, respectively. Free volume was calculated at room temperature and Tg. By doing so, the direct correlation between fragility, structural relaxation enthalpy, diffusion, and free volume was shown. Using a compression test at room temperature, a 58% improvement in plastic strain was obtained for HEBMG, which confirmed the calculations. (c) 2021 Elsevier B.V. All rights reserved.
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