Phase Stability of (Fe80Nb6B14)0.9Tb0.1 Bulk Nanocrystalline Magnet
A. Chrobaka, G. Ziółkowskia, N. Randrianantoandrob
aInstitute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland
bInstitut des Molécules et des Matériaux du Mans, UMR CNRS 6283, Université du Maine, 72085 Le Mans cedex 9, France
Full Text PDF
The paper refers to phase stability of the (Fe80Nb6B14)0.9Tb0.1 bulk nanocrystalline alloys prepared using the vacuum suction casting technique. The samples were in the form: of rods with diameters d=2, 1.5, 1 and 0.5 mm. Heating up to 900 K reveals structural changes that occur at temperatures above 680 K (DSC and M(T) measurements). The phase analysis, using Mössbauer spectra, indicates the decrease of Tb2Fe14B and increase of Fe content in the samples after the heat treatment. The most stable is the alloy with d=1 mm, where the formation of α-Fe phase was not observed. The decrease of d causes significant hardening i.e. coercive field increases from 0.57 T to 2.66 T for d=2 mm and d=0.5 mm, respectively.

DOI: 10.12693/APhysPolA.126.176
PACS numbers: 81.07.Bc, 75.50.Tt, 75.60.d, 76.80.+y