The thermal stability and activation energy of crystallization of (Cu61.8Zr38.2)1−xAlx bulk metallic glasses |
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| Affiliation: | 1. State Key Laboratory of Materials Modification and Department of Materials Engineering, Dalian University of Technology, Dalian 116024, China;2. Department of Physics and Materials Science, City University of Hong Kong, Kowloon, Hong Kong |
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| Abstract: | The present paper reports on the thermal stability and activation energy of crystallization of bulk metallic glasses (BMGs) (Cu61.8Zr38.2)1−xAlx. The (Cu61.8Zr38.2)1−xAlx composition series, prepared by copper mould suction casting into bars with a diameter of 3 mm, form BMGs with an e/a range of 1.24–1.3. These BMGs manifest increased thermal stability with increased e/a ratios. The activation energies (ΔE) of crystallization as derived from thermal analysis at different heating rates follow a similar tendency to that of the thermal stability, indicating stronger short-range ordering with increasing e/a ratios. The optimum BMG Cu58.1Zr35.9Al6 exhibits the highest thermal stability and the largest ΔE. |
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