Abstract
It was found that the Ti45-xZrxNi45-zCuz (0 ≤ x ≤ 10, 0 ≤ z ≤ 10) metallic glasses crystallize polymorphously and the crystal phase forms a solid solution of Zr and Cu in the TiNi phase. Differential scanning calorimetry (DSC) was used to study the crystallization kinetics of Ti-Zr-Ni-Cu metallic glasses near glass transition temperature. The fraction transformed y, as a function of time are of sigmoidal type at each temperature. For 0.10 ≤ y ≤ 0.85 the plots satisfy the Johnson-Mehl-Avrami equation and approximate to straight lines with exponent n varying from 3.1 to 3.9 as the annealing temperature increases. The activation energy for the crystallization of Ti45Zr5Ni45Cu5 metallic glass estimated from the temperature corresponding to 50% transformation is close to 380 kJ/mol.
Original language | English |
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Pages (from-to) | 2406-2409 |
Number of pages | 4 |
Journal | Materials Transactions |
Volume | 42 |
Issue number | 11 |
DOIs | |
Publication status | Published - 2001 Nov |
Keywords
- Activation energy
- Amorphous alloy
- Differential scanning calorimetry
- Isothermal crystallization kinetics
- Titanium-zirconium-nickel-copper metallic glass
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering