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Crystallization kinetics of the Zr55.9Cu18.6Ta8Al7.5Ni10bulk metallic glass matrix composite under isothermal conditions

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
419
Identifiers
DOI: 10.1016/j.jallcom.2005.09.073
Keywords
  • Crystallization Kinetics
  • Bulk Metallic Glass Matrix Composite
  • Thermal Analysis

Abstract

Abstract A Zr 55.9Cu 18.6Ta 8Ni 10Al 7.5 bulk metallic glass (BMG) composite with an amorphous matrix reinforced by micro-scale particles of Ta-rich solid solution was prepared by copper-mold casting. The crystallization kinetics of the BMG composite was investigated under isothermal conditions by differential scanning calorimetry (DSC) and was modeled by the Johnson–Mehl–Avrami equation. It was found that the crystallization process follows three distinct stages with different Avrami exponents. The average Avrami component was about 2.5 at the initial and final stages, implying a mechanism of diffusion-controlled three-dimensional growth with a constant nucleation rate. However, the Avrami exponent was higher than 4 in the middle stage, indicating that the crystallization involved a transient nucleation process with an increasing nucleation rate. The different mechanisms in various stages of crystallization were tentatively discussed from a structural point of view.

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