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Nonisothermal crystallization kinetics, fragility and thermodynamics of Ti20Zr20Cu20Ni20Be20 high entropy bulk metallic glass

Published online by Cambridge University Press:  25 August 2015

Pan Gong Open the ORCID record for Pan Gong [Opens in a new window] ,
Shaofan Zhao ,
Hongyu Ding ,
Kefu Yao  and
Xin Wang
Pan Gong*
Affiliation:
School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Shaofan Zhao
Affiliation:
School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Hongyu Ding
Affiliation:
School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Kefu Yao*
Affiliation:
School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Xin Wang
Affiliation:
School of Materials Science and Engineering, Hebei University of Technology, Hongqiao District, Tianjin 300130, China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

The nonisothermal crystallization kinetics, fragility, and thermodynamics of Ti20Zr20Cu20Ni20Be20 high entropy bulk metallic glass (HE-BMG) have been investigated by differential scanning calorimetry. The activation energies for the glass transition and crystallization events were determined by Kissinger and Ozawa methods. The value of local Avrami exponent is less than 1.5 in most cases for all the three crystallization events, indicating that the major crystallization mechanism is diffusion-controlled growth of pre-existing nuclei. The local activation energy is stable during the whole crystallization process and this further confirms that the crystallization occurs through a single mechanism. Ti20Zr20Cu20Ni20Be20 alloy can be classified into “strong glass formers” according to the estimated fragility index and also shows a relatively low value of Gibbs free energy difference. However, compared with Zr41.2Ti13.8Cu12.5Ni10Be22.5 BMG, the glass-forming ability of Ti20Zr20Cu20Ni20Be20 HE-BMG is much lower and the related reasons have been discussed.

Keywords

calorimetryalloyamorphous
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 18 , 28 September 2015 , pp. 2772 - 2782
Copyright
Copyright © Materials Research Society 2015 

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