Crystallisation progress in Si-rich ultra-soft nanocomposite alloy fabricated by melt spinning

The crystallisationprocessandtheultras-softmagneticpropertiesofamorphous/nanocompositealloy Fe73:5Si17:5B5Nb3Cu1 fabricatedbyconventionalmelt-spinningtechniquearesystematicallyinvestigated in termsofthermalanalysisandin-situmeasurementofmagnetisationdynamics.Thethermalanalysis using differentialscanningcalorimetryshowedthatcrystallisationfromFe-basedamorphousstateto a- Fe(Si) startedat535 3C. Furtherheatingthesampleleadstoatransformationfromthe a-Fe(Si) to Fe-B phases at670 3C. Crystallisationactivationenergiesweredeterminedusingtwomodels:Kissingerand John–Mehl–Avrami(JMA),whichwereconsistenttoeachotherwithavalueof2:8170:03 eV.High resolution transmissionelectronmicroscopyinvestigationrevealedanultrafinestructureof a-Fe(Si) nanocrystallite withmeansizeof12.5nmembeddedinanamorphousmatrix.Atavolumefractionof 86% of a-Fe(Si) phase,optimumsoftmagneticpropertieswereobtainedwithveryhighpermeabilityof 110,000andaverylowcoercivityof0.015Oebyannealingtheamorphousalloyat530 3C in40min.

Title: 

	Crystallisation progress in Si-rich ultra-soft nanocomposite alloy fabricated by melt spinning
Authors:	Ngo, Duc The Nguyen, Hoang Hai Duong, Hong Gam
Keywords:	Amorphous alloys Nanocrystallinematerials Permeability Finemet
Issue Date:	2010
Publisher:	ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Citation:	ISIKNOWLEDGE
Abstract:	The crystallisationprocessandtheultras-softmagneticpropertiesofamorphous/nanocompositealloy Fe73:5Si17:5B5Nb3Cu1 fabricatedbyconventionalmelt-spinningtechniquearesystematicallyinvestigated in termsofthermalanalysisandin-situmeasurementofmagnetisationdynamics.Thethermalanalysis using differentialscanningcalorimetryshowedthatcrystallisationfromFe-basedamorphousstateto a- Fe(Si) startedat535 3C. Furtherheatingthesampleleadstoatransformationfromthe a-Fe(Si) to Fe-B phases at670 3C. Crystallisationactivationenergiesweredeterminedusingtwomodels:Kissingerand John–Mehl–Avrami(JMA),whichwereconsistenttoeachotherwithavalueof2:8170:03 eV.High resolution transmissionelectronmicroscopyinvestigationrevealedanultrafinestructureof a-Fe(Si) nanocrystallite withmeansizeof12.5nmembeddedinanamorphousmatrix.Atavolumefractionof 86% of a-Fe(Si) phase,optimumsoftmagneticpropertieswereobtainedwithveryhighpermeabilityof 110,000andaverylowcoercivityof0.015Oebyannealingtheamorphousalloyat530 3C in40min.
Description:	TNS06206 ; JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS Volume: 322 Issue: 3 Pages: 342-347
URI:	http://repository.vnu.edu.vn/handle/VNU_123/29088 http://www.sciencedirect.com/science/article/pii/S0304885309009512
ISSN:	0304-8853
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