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Titolo:
MICROSTRUCTURAL EVOLUTION OF FINEMET TYPE ALLOYS WITH CHROMIUM - AN ELECTRON-MICROSCOPY STUDY
Autore:
MILLAN M; CONDE CF; CONDE A;
Indirizzi:
UNIV SEVILLA,CSIC,INST CIENCIA MAT,DEPT FIS MAT CONDENSADA,APARTADO 1065 E-41080 SEVILLE SPAIN
Titolo Testata:
Journal of Materials Science
fascicolo: 14, volume: 30, anno: 1995,
pagine: 3591 - 3597
SICI:
0022-2461(1995)30:14<3591:MEOFTA>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOFT MAGNETIC-MATERIALS; GRAIN-STRUCTURE; AMORPHOUS FE73.5CU1NB3SI13.5B9; NANOCRYSTALLINE FERROMAGNETS; MOSSBAUER-SPECTROSCOPY; CRYSTALLIZATION; TRANSFORMATIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
M. Millan et al., "MICROSTRUCTURAL EVOLUTION OF FINEMET TYPE ALLOYS WITH CHROMIUM - AN ELECTRON-MICROSCOPY STUDY", Journal of Materials Science, 30(14), 1995, pp. 3591-3597

Abstract

Microstructural changes in Fe73.5-xCrxCu1Nb3Si13.5B9 (0 less than or equal to X less than or equal to 5) alloys with thermal treatment werestudied by electron microscopy. In a first stage, around 800 K, an Fe(Si) nanocrystalline phase is formed in the amorphous residual matrix. Crystallization onset is en ha need with the Cr content of the alloy. In a second stage, arou nd 950 K, full crystallization of the samplesleads to the formation of a body centred cubic (b.c.c.) boride-type unknown crystal phase with a lattice parameter of a=1.52 nm, and recrystallization of the previous Fe(Si) nanophase also occurs. No qualitative differences were found between dynamic and isothermal crystallization. The size effect for thin samples is limited to a lowering of crystallization temperatures. For isothermal nanocrystallization in the temperature range 775-900 K, the mean grain size of the nanocrystals increases for short annealing times to stabilize at a constant value of about 10-15 nm for long annealing times. The stabilized grain size increases with increasing annealing temperature and slightly decreases withthe Cr content of the alloy.

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Documento generato il 29/11/20 alle ore 18:35:35