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Journal of Thermal Analysis and Calorimetry

, Volume 115, Issue 1, pp 267–274 | Cite as

On non-isothermal kinetics of two Cu-based bulk metallic glasses

  • Jili Wu
  • Ye Pan
  • Jinhong Pi
Article

Abstract

In this paper, two Cu-based bulk metallic glasses, Cu55Zr37Ti8 and Cu61Zr34Ti5, have been evaluated in thermodynamics and kinetics. The activation energies with the constant values were generalized by different theoretical models. The E x of Cu55Zr37Ti8 and Cu61Zr34Ti5 are 319 ± 12 and 359 ± 12 kJ mol−1, respectively, implying that the as-cast alloys have a good stability in thermodynamics. On the other hand, variable activation energies were also determined using Kissinger–Akahira–Sunose method, Ozawa–Flynn–Wall method, and Friedman’s method. The results showed that the Ea(x) at the beginning of the crystallization are higher than that at the end of the crystallization in the first exothermic peak. By introducing the local Avrami exponent, n(x), the growth and nucleation mechanisms were discussed. Furthermore, the effects of different activation energies on local Avrami exponent were also given a discussion.

Keywords

Cu-based bulk metallic glass Non-isothermal kinetics Activation energy Local Avrami exponent 

Notes

Acknowledgements

Thanks for financial support from the National Natural Science Foundation of China (Grant no. 50971041).

Supplementary material

10973_2013_3288_MOESM1_ESM.doc (240 kb)
Supplementary material 1 (DOC 240 kb)

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2013

Authors and Affiliations

  1. 1.School of Materials Science and Engineering, Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjingPeople’s Republic of China
  2. 2.School of Material EngineeringNanjing Institute of TechnologyNanjingPeople’s Republic of China

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