Curie temperature in Fe(Ni)Nb based mechanically alloyed materials |
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| Authors: | J. J. Suñol A. Gonzőlez L. Escoda A. Vilaró |
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| Affiliation: | (1) GRMT, Dept. de Física. Universitat de Girona, Santaló s/n, 17071 Girona, Spain;(2) GRMT, Dept. de Física. Universitat de Girona, Santaló s/n, 17071 Girona, Spain;(3) GRMT, Dept. de Física. Universitat de Girona, Santaló s/n, 17071 Girona, Spain;(4) GRMT, Dept. de Física. Universitat de Girona, Santaló s/n,, 17071 Girona, Spain |
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| Abstract: | Summary A conventional thermogravimeter has been adapted with a small magnet to detect the Curie temperature, TC. 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. |
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| Keywords: | TG mechanical alloying Curie temperature Fe-Nb based alloys |
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