Abstract
In this paper, the effect of temperature on the isothermal crystallization of Zr55Cu30Al10Ni5bulk 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 Zr55Cu30Al10Ni5bulk 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.
Original language | English |
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Pages (from-to) | 114-121 |
Number of pages | 8 |
Journal | Journal of Alloys and Compounds |
Volume | 396 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 21 Jun 2005 |
Keywords
- Amorphous materials
- Phase transition
- Thermal analysis
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry