Abstract
The phase transition by crystallization and a grain growth behavior of a Zr65 Cu27.5Al7.5 metallic glass were examined as a function of isothermal annealing time at various temperatures. At the initial stage of crystallization, a metastable Zr(Al,Cu) phase is observed, in addition to a main phase of Zr2Cu, below the annealing temperature of 730 K. The formation of Zr(Al, Cu) may be attributed to the strong chemical affinity between Al and Zr. The grain growth rate for Zr2 Cu is extremely low comparing with that for a Zr65Cu35 binary metallic glass. Therefore, the strong chemical affinity between Al and Zr seems to contribute to the retardation of nucleation and grain growth of the crystalline phases. The grain growth kinetics can be described by log(dD/dtg) = log(k/3) - 2 log D where D is the measured grain size, tg the grain growth time and k the constant. The activation energy Q for grain growth is calculated to be 165 kJ mol-1.
Original language | English |
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Pages (from-to) | 338-342 |
Number of pages | 5 |
Journal | Materials Science and Engineering A |
Volume | 304-306 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 2001 May 31 |
Externally published | Yes |
Keywords
- Grain growth
- Kinetics
- Phase transformation
- Zirconium-based metallic glass
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering