The role of metallic (M) elements in the ageing behavior of amorphous Fe-Si-B-M (M = Nb, Zr, or V) alloys
- Ehime Univ., Matsuyama (Japan). Dept. of Materials Science and Engineering
To clarify the mechanism of nanocrystallization, the ageing-induced behavior of amorphous Fe{sub 84{minus}x}Si{sub 6}B{sub 10}M{sub x} (M = Nb, Zr, or V) alloys was examined using differential scanning calorimetry (DSC), transmission electron microscopy, and high-frequency magnetic measurements. In a comparison between the Fe{sub 82}Si{sub 6}B{sub 10}M{sub 2} and Fe{sub 80}Si{sub 6}B{sub 10}M{sub 4} (M = Nb or Zr) alloys, a notable difference in the peak morphology was observed on the DSC curves. Ageing for 3.6 ks in the first exothermic temperature range produced ultrafine {alpha}-Fe grains only for the latter alloys, and their effective permeability was markedly enhanced by prolonged ageing below 623 K. However, no appreciable difference in such ageing-induced behavior was determined between the Fe{sub 82}Si{sub 6}B{sub 10}V{sub 2} and Fe{sub 80}Si{sub 6}B{sub 10}V{sub 4} alloys. These results were reasonably explained as being related to a structural change in the amorphous phase resulting from the increase in the Nb or Zr content. It was concluded that the formation of an increased number of {alpha}-Fe nuclei originates from the concurrent stabilization of the amorphous structure, because the mobility of Fe and Si atoms is extremely reduced due to the large atomic size of Nb or Zr and their attractive interactions with the Fe atoms.
- OSTI ID:
- 651095
- Journal Information:
- Acta Materialia, Vol. 46, Issue 13; Other Information: PBD: 10 Aug 1998
- Country of Publication:
- United States
- Language:
- English
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