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Titolo:
Crystallization kinetics and phase transition under high-pressure of amorphous Sm8Fe85Si2C5 alloy
Autore:
Zhang, XY; Zhang, JW; Wang, WK;
Indirizzi:
Yanshan Univ, Coll Mat Sci & Engn, Qinhuangdao 066004, Peoples R China Yanshan Univ Qinhuangdao Peoples R China 066004 066004, Peoples R China
Titolo Testata:
ACTA MATERIALIA
fascicolo: 19, volume: 49, anno: 2001,
pagine: 3889 - 3897
SICI:
1359-6454(20011114)49:19<3889:CKAPTU>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
PERMANENT-MAGNETS; NANOCOMPOSITE MAGNETS; ENERGY PRODUCT; MICROSTRUCTURE; BEHAVIOR; ND; COERCIVITY; SI;
Keywords:
melt spinning; metallic glasses; kinetics; magnetic (hard); nanocomposite magnets;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Zhang, XY Univ Stuttgart, Inst Theoret & Angew Phys, Pfaffenwaldring 57, D-70550 Stuttgart, Germany Univ Stuttgart Pfaffenwaldring 57 Stuttgart Germany D-70550 any
Citazione:
X.Y. Zhang et al., "Crystallization kinetics and phase transition under high-pressure of amorphous Sm8Fe85Si2C5 alloy", ACT MATER, 49(19), 2001, pp. 3889-3897

Abstract

The crystallization kinetics and phase transition under high pressure of amorphous Sm8Fe85Si2C5 have been investigated. The activation energy of crystallization of both alpha -Fe and Sm-2(Fe,Si)(17)C-x phases in the alloy islarger at the beginning of crystallization, and it undergoes little changein a larger range of crystallized fraction. This essentially results in the formation of an alpha -Fe/Sm-2(Fe,Si)(17)C-x composite microstructure with a relatively coarse grain size. High pressure has a large effect on the phase transition of the amorphous alloy as it is annealed at 923 K. By increasing pressure from normal pressure to 6 GPa, the grain size of crystallinephases decreases from 30.6 to 6.4 nm for the alpha -Fe phase and from 28.7to 5.8 nm for the Sm-2(Fe,Si)(17)C-x phase. A small grain size of less than 10 nm is required by theoretical models for enhancing magnetic propertiesof the composites. The volume fraction of Sm-2(Fe,Si)(17)C-x increases with pressure, As pressure increases to 6 GPa, a change in crystallization sequence between the alpha -Fe phase and the Sm-2(Fe,Si)(17)C-x phase is observed. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

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Documento generato il 13/07/20 alle ore 17:30:34