Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/17716
Title: The effect of temperature on the crystallization of Zr55CU30Al10Ni5 bulk metallic glass in the glass transition region
Authors: Liu, L
Chan, KC 
Zhang, T
Keywords: Amorphous materials
Phase transition
Thermal analysis
Issue Date: 2005
Publisher: Elsevier Science Sa
Source: Journal of alloys and compounds, 2005, v. 396, no. 1-2, p. 114-121 How to cite?
Journal: Journal of Alloys and Compounds 
Abstract: In this paper, the effect of temperature on the isothermal crystallization of Zr55Cu30Al10Ni5 bulk metallic glass in the glass transition region was investigated by differential scanning calorimetry, X-ray diffraction and scanning electron microscopy. It was found that the crystallization behaviour of Zr55Cu30Al10Ni5 bulk metallic glass strongly depends on the annealing temperature. The crystallization follows a diffusion-controlled growth mechanism with the formation of a dendritic-like structure in the high temperature region from 743 to 753 K. However, it follows two different mechanisms, i.e. diffusion-controlled and interface-controlled, with the formation of both dendritic-like and spherical structures, respectively, in the low temperature region from 723 to 739 K. Furthermore, the activation energy for crystallization from supercooled liquid is also temperature-dependant. The apparent activation energy is about 212 kJ/mol in the high temperature region, but 314 kJ/mol in the low temperature region. The different crystallization behaviour is believed to be due to the different structures that the metallic glass possesses at different temperatures.
URI: http://hdl.handle.net/10397/17716
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2004.12.002
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