Analysis of the Samples of Fe-Cu-Nb-Si-B Amorphous Alloys Obtained by Dynamic Compacting Method
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Analysis of the Samples of Fe-Cu-Nb-Si-B Amorphous Alloys Obtained by Dynamic Compacting Method Victor A. Golubev, Andrey V. Strikanov, Grigory A. Potemkin, Ludmila V. Zueva, Aleksey V. Golubev, Eleonora V. Olenina, Vladimir G. Bugrov, Aleksey V. Sten’gach, and Rickey J. Faehl2 Russian Federal Nuclear Center All-Russian Research Institute of Experimental Physics 37, Mira pr., Sarov, Nizhny Novgorod region, 607190, Russia [email protected] 2
LANL, Los Alamos, NM 87545
INTRODUCTION The shock wave (dynamic) compacting method (DCM) is promising method to produce considerable-size nonporous wares. The phenomenon is based on the impact of shock wave on the initial powders of amorphous alloys. Every time when the shock wave propagates through the bulk of substance then the temperature rises substantially. Therefore there is a need of study of the DCM’s effect on the structure and properties of the amorphous alloys. The technique for shock wave compacting of powders of amorphous soft magnetic alloys such as “Finemet” (5BDSR) and “Gammamet” (GM414) is presented in the paper [1]. The circular magnetic conductors that produced have high density (relative one up to 98.5%) and wholly satisfactory magnetic characteristics. For example, maximal magnetic permeability rises by factor 20 with regard to characteristic of circular magnetic conductors obtained from initial powders by common method. In addition, magnetic characteristics of compact sample rise by factor 12 after thermal processing. The purposes of the paper are that to explain the increase of magnetic characteristics, and to investigate the structure deformations due to shock-wave treatment of the powder and due to subsequent thermal or thermo-magnetic treatment at different temperatures. Soft magnetic alloy “Finemet” (5BDSR) [2-10] has Fe84.1 Cu1.3 Nb
5.6
Si7.7 B1.3 composition that expressed in weight
percentages. The “Gammamet” (GM414) [11] has Fe83.4 Cu1.3 Mo2.8 Nb2.8 Si7.7 B2 composition. The results of the thermal and XRD-analysis as well as the data about thermal and thermo-magnetic treatment are presented in the paper.
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THERMAL ANALYSIS Differential Scanning Calorimetry research of the initial powders of alloys were carried out on the thermo- analyser «Setaram» in argon atmosphere. As a result we found the endothermic peak at the temperature about 300°C and three exothermic peaks at higher temperatures. The endothermic peak corresponds to glass transition. The exothermic peaks are related with the formation of nanocrystalline phases such as Fe3Si, Fe3B etc. The typical thermograms for 5BDSR and GM414 are shown on the Fig.1, 2, respectively.
Fig.1. The thermogram of 5BDSR (“Finemet”) amorphous alloy powder
Fig.2. The thermogram of GM414 (“Gammamet”) amorphous alloy powder
When we compare the thermograms for 5BDSR and GM414 then we can see that first 5BDSR’s exothermic peak is substantially less than GM414’s one. It confirms the data about the preliminary thermal treatment of GM414 by manufacturer. It is of interest thermograv
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