Formation of nanocrystalline structure during electron irradiation induced crystallization in amorphous Fe–Zr–B alloys
✍ Scribed by T. Nagase; Y. Umakoshi; N. Sumida
- Publisher
- Institute of Physics and National Institute of Materials Science
- Year
- 2002
- Tongue
- English
- Weight
- 536 KB
- Volume
- 3
- Category
- Article
- ISSN
- 1468-6996
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✦ Synopsis
Effect of electron irradiation on the crystallization and phase stability of Fe 88 Zr 9 B 3 and Fe 71 Zr 9 B 20 amorphous alloys was examined. Electron irradiation at an accelerated voltage of 2000 kV was performed at room temperature. The Fe 71 Zr 9 B 20 alloy showed a wide supercooled liquid region and the DT x value was 71 K, while no glass transition was observed in Fe 88 Zr 9 B 3 alloy. The amorphous phase in Fe±Zr± B alloys was not stable under irradiation and crystallization from the amorphous phase was accelerated by the irradiation. Nanocrystalline structure composed of a-Fe and cubic-Fe 2 Zr was formed in Fe 88 Zr 9 B 3 alloy by irradiation induced crystallization, while no nanoscale precipitates of intermetallic compounds were formed during annealing. In Fe 71 Zr 9 B 20 alloy, the formation of nanocrystalline precipitates was also con®rmed by irradiation induced crystallization, although the formation of nanocrystalline structure had not been realized in high B concentration Fe±Zr±B alloys by annealing. These new results show that electron irradiation is effective in producing a new nanocrystalline structure.