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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

© Journal of Thermal Analysis and Calorimetry, 2005, vol. 80, núm. 2, p. 257-261

Springer Verlag

Author: Suñol Martínez, Joan Josep
González Gasch, Àlex
Escoda i Acero, Ma. Lluïsa
Vilaró, A.
Date: 2005 May 1
Abstract: 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
ISSN: 1388-6150 (versió paper)
1588-2926 (versió electrònica)
Document access: http://hdl.handle.net/10256/12731
Language: eng
Publisher: Springer Verlag
Collection: MICYT/2003-2006/MAT2003-08271-C02-02
Reproducció digital del document publicat a: http://dx.doi.org/10.1007/s10973-005-0645-2
Articles publicats (D-F)
Is part of: © Journal of Thermal Analysis and Calorimetry, 2005, vol. 80, núm. 2, p. 257-261
Rights: Tots els drets reservats
Subject: Temperatura de Curie
Curie temperature
Aliatges
Alloys
Title: Curie temperature in Fe(Ni)Nb based mechanically alloyed materials
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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