Isothermal crystallization in Ce70Ga6Cu24 bulk metallic glass |
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Authors: | WeiXin Jiang Bo Zhang |
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Affiliation: | 1. School of Material Science and Engineering, Hefei University of Technology, Hefei, 230009, China 2. Anhui Provincial Key Lab of Functional Materials and Devices, Hefei University of Technology, Hefei, 230009, China
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Abstract: | The isothermal crystallization behaviors in a newly developed CeGaCu bulk metallic glass have been investigated through the classic differential scanning calorimeter (DSC) method. It is found that the apparent activation energy (E a ) strongly depends on the fraction (x) of isothermal crystallization. Johnson-Mehl-Avrami (JMA) formula was used to analyze the mechanism of crystallization and the obtained Avrami exponent (n) was discovered to show an obvious correlation with the crystallization fraction x. With the help of the relation between E a and n, the nucleation and growth activation energies, E n and E g , were estimated to be 214–304 kJ/mol and 91 kJ/mol, respectively. This result suggests that the main energy barrier against crystallization in the present glass should be the nucleation of nucleates, rather than the growth of crystals. Such a large E n is also believed to be responsible for the good glass forming ability of the CeGaCu alloy. |
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Keywords: | Ce-based bulk metallic glass activation energy Avrami exponent nucleation and growth |
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