Electron irradiation-induced nanocrystallization of amorphous Fe85B15 alloy: Evidence for athermal nature
✍ Scribed by W. Qin; T. Nagase; Y. Umakoshi
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 469 KB
- Volume
- 57
- Category
- Article
- ISSN
- 1359-6454
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✦ Synopsis
Nanocrystallization of amorphous alloys induced by electronic energy deposition has been frequently reported in recent years. In this paper, the crystallization of amorphous Fe 85 B 15 alloy was performed by electron irradiation with 2 MeV electrons up to a flux of 4.0 Â 10 24 m À2 s À1 . It was found that at 298 K, nanocrystalline Fe-B intermetallic phases formed prior to a-Fe phase, while at 463 K, only the a-Fe phase was observed. This phenomenon cannot be interpreted in terms of the electron-beam heating, but may be attributed to the irradiation-induced increases in the short-range order and atomic diffusivity. Theoretical analysis also showed that the maximum-temperature rise driven by beam heating is much lower than that required for thermal crystallization. Our work offers strong evidence that the irradiation-induced crystallization in amorphous alloys is not a thermal activation process.