Phase stability and structural relaxation in Fe86-xNbxB14 amorphous alloys
|Artur Chrobak 1, Marian Kubisztal 2, Dariusz Chrobak 2, Grzegorz Haneczok 2, Piotr Kwapuliński 2, Zbigniew Stokłosa 2, Józef Rasek 2|
1. University of Silesia, Institute of Physics, Uniwersytecka 4, Katowice 40-007, Poland
It is known that magnetic and mechanical properties of amorphous alloys based on iron can be controlled by applying a suitable thermal annealing leading to the so-called structural relaxation and nanocrystallization. Recently, we have reported that for the Fe86-xNbxB14 (2≤x≤8) amorphous alloys the structural relaxation - i.e. annealing out of free volume and formation of small iron clusters  - plays the main role in the process of optimization of soft magnetic properties. It makes possible to obtain a good soft magnetic material free of brittleness - the main disadvantage of nanomagnets. The aim of this paper is to study the influence of Nb content, structural changes and phase stability of amorphous structure on different physical properties. The following measurements were carried out: i) heat of transition amorphous-crystalline state (DSC, 300-800 K), ii) activation enthalpy of crystallization (DSC, magnetic balance), iii) Young modulus (vibrating reed apparatus, 300-800 K), iv) magnetic permeability (Maxwell-Wien bridge, H=0,5 A/m). Phase stability was studied by making use of magnetic after-effects-∆µ/µ (difference in permeability after demagnetization).
1. G.Haneczok, J.E.Frąckowiak, A.Chrobak, P.Kwapuliński, J.Rasek, Physica Status Solidi (a) 202 (2005) 2574.
Presentation: Poster at E-MRS Fall Meeting 2006, Symposium I, by Artur Chrobak
See On-line Journal of E-MRS Fall Meeting 2006
Submitted: 2006-05-15 10:39 Revised: 2009-06-07 00:44
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