Dynamic Compacting of Powders of Some Amorphous Alloys
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Dynamic Compacting of Powders of Some Amorphous Alloys Victor A. Golubev, Andrey V. Strikanov, Aleksey V. Golubev, Vladimir G. Bugrov, Grigory A. Potemkin, Valery B. Kudel’kin, Мikhail А. Mochalov and Rickey J. Faehl2 Russian Federal Nuclear Center All-Russian Research Institute of Experimental Physics, Russia, Nizhny Novgorod region, Sarov, pr. Mira, 37 [email protected] 2
LANL, Los Alamos, NM 87545
Introduction The problem of decreasing power losses has been always urgent for electric equipment manufacturers. During the recent decades, this problem has been solved by applying amorphous soft magnetic metal alloys in order to make components for electric equipment. The amorphous soft magnetic alloys feature such unique properties as high magnetic permeability, low coercive force and temperature-independent electrical conductivity. Besides, these alloys offer the additional advantages: high mechanical viscosity, high yield stress and extraordinary high corrosion resistance [1]. However, the fabrication of bulky parts from amorphous alloys is a rather sophisticated problem. The compressibility of such powders is rather low, the porosity of parts produced in this way constitutes approximately from 20 to 40 percent. It essentially reduces the end properties of the fabricated products. The technique of hot pressing cannot be used in full because of the loss of amorphism by alloys at high temperatures. In recent years, the products fabricated by shock-wave compression from amorphous strips and powders [2-8] have been brought into focus. As it is well-known, in the front of a shock wave a solid material behaves like liquid, therefore, due to the method of dynamic pressing it seems possible to attain essentially higher densities of compacting particles of amorphous alloy powders. The majority of publications and patents [2-8] were developed and executed in 1980s-1990s. New amorphous soft magnetic alloys appeared and their comprehensive study was conducted from the point of view of presence of nano-crystalline formations in their structure. Therefore, the problem of explosive pressing of powders of amorphous soft magnetic alloys remains urgent.
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Studied materials In order to conduct studies, the powders of the following alloys were selected: 5BDSR (of Fe84.1Cu1.3Nb5.6Si7.7B1.3 composition) and GМ414 (of Fe83.4Cu1.3Nb5.6Si7.7B2 composition ) [9]. These are well-known soft magnetic alloys produced by high-speed hardening of the melt on the surface of the rapidly rotating cooling drum. Their benefits are the following: high induction at low coercive force, low magnetic reversal-related losses at high frequencies, magnetic striction close to zero, high magnetic permeability and high specific electric resistance. The alloy powders were produced from the strip by powdering at low temperatures. At that, the powder particles had the form of 20 µm-thick elongated fragments of the lamellar scaly shape and 160µm maximal length. The GM414 powder was thermally treated after powdering. Technique t
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