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Curie temperature in Fe(Ni)Nb based mechanically alloyed materials

A conventional thermogravimeter has been adapted with a small magnet to detect the Curie temperature, T C. The measurements were performed in several Fe(Ni)NbB alloys developed in a nanocrystalline form by mechanical alloying. The B addition favors a slight diminution (10-20°C), and the Ni addition the existence of three transitions related with bccFe, fcc(Fe-Ni) abd fccNi-rich environments. Furthermore, complementary analysis were performed by means of differential thermal analysis, scanning electron microscopy with energy dispersive X-ray microanalysis and by induced coupled plasma. Small contamination was found. A mass increase (about 1 mass%) was detected by thermogravimetry related to oxidation. Analysis allows us to state the inhomogeneity of the alloys obtained after 80 h of milling

Financial support from MICYT (project No. MAT2003-08271) and DURSI (project 2001SGR-00190) is acknowledged

Springer

Director: Ministerio de Ciencia y Tecnología (Espanya)
Autor: Suñol Martínez, Joan Josep
González Gasch, Àlex
Escoda i Acero, Ma. Lluïsa
Vilaró, A.
Data: 1 maig 2005
Resum: A conventional thermogravimeter has been adapted with a small magnet to detect the Curie temperature, T C. The measurements were performed in several Fe(Ni)NbB alloys developed in a nanocrystalline form by mechanical alloying. The B addition favors a slight diminution (10-20°C), and the Ni addition the existence of three transitions related with bccFe, fcc(Fe-Ni) abd fccNi-rich environments. Furthermore, complementary analysis were performed by means of differential thermal analysis, scanning electron microscopy with energy dispersive X-ray microanalysis and by induced coupled plasma. Small contamination was found. A mass increase (about 1 mass%) was detected by thermogravimetry related to oxidation. Analysis allows us to state the inhomogeneity of the alloys obtained after 80 h of milling
Financial support from MICYT (project No. MAT2003-08271) and DURSI (project 2001SGR-00190) is acknowledged
Format: application/pdf
Accés al document: http://hdl.handle.net/10256/12731
Llenguatge: eng
Editor: Springer
Col·lecció: info:eu-repo/semantics/altIdentifier/doi/10.1007/s10973-005-0645-2
info:eu-repo/semantics/altIdentifier/issn/1388-6150
info:eu-repo/semantics/altIdentifier/eissn/1588-2926
MICYT/2003-2006/MAT2003-08271-C02-02
Drets: Tots els drets reservats
Matèria: Temperatura de Curie
Curie temperature
Aliatges
Alloys
Títol: Curie temperature in Fe(Ni)Nb based mechanically alloyed materials
Tipus: info:eu-repo/semantics/article
Repositori: DUGiDocs

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