Journal article
Second amorphous-to-crystalline phase transformation in Cu60Ti20Zr20 bulk metallic glass
The second amorphous-to-crystalline phase transformation in Cu60Ti20Zr20 bulk metallic glass was investigated by differential scanning calorimetry and x-ray diffractometry. The difference of the Gibbs free energies between the amorphous phase and the crystalline products during the transformation is estimated to be about 2.46 kJ mol(-1) at 753 K, much smaller than the 61 kJ mol(-1) obtained assuming that it is a polymorphic transformation.
It was revealed that the phase transformation occurs through a eutectic crystallization of Cu51Zr14 and Cu2TiZr14 having an effective activation energy of the order of 400 kJ mol(-1). The average Avrami exponent n is about 2.0, indicating that the crystallization is diffusion controlled.
Language: | English |
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Year: | 2007 |
Pages: | 246206 |
ISSN: | 1361648x and 09538984 |
Types: | Journal article |
DOI: | 10.1088/0953-8984/19/24/246206 |
ORCIDs: | Horsewell, Andy |