Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

Thin-layered amorphous Fe73Co5Y3B19 strips produced by the melt-spinning method

nr katalogowy: 79744

The development of new electron technologies and studies of crystalline structures conducted over the last years have resulted in new amorphous magnetic materials. The first manufacturer of amorphous strips was the American company Allied Chemical Co. In Poland, the studies of amorphous strips were initiated by the Institute of the Polish Academy of Sciences in Warsaw, the Institute of Materials Engineering of the Warsaw University of Technology, the Institute of Nonferrous Metals in Gliwice, as well as the Institute of Physics and the Institute of Materials Engineering of the Czestochowa University of Technology [1]. Amorphous strips are produced by the method of rapid cooling on a spinning copper cylinder, at a cooling rate from 105 to 106 K/s; this method is also known as melt-spinning. The alloys are composed of not more than three components, the first of which should be a combination of transition metals, and the others, a metalloid or its combination. The selected components should exhibit the ability to form an amorphous state. When the main components are characterized by a negative heat of mixing, the energy gap at the interface increases when the material is combined. The viscosity of the molten material increases, which reduces the migration of ions that leads to the formation of crystalline phase nuclei [1÷5]. Most prone to vitrification are alloys that have transitions metals, such as cobalt, iron or nickel, in their composition. In the process, an addition of a metalloid is also needed, which allows lower critical cooling rates to be achieved. Such metalloids include carbon, boron or silicon. For the nitrification of an amorphous alloy to occur, the alloy needs to be cooled at a rate higher than the critical cooling rate. By cooling an alloy at appropriate cooling rates, we are able to obtain a partially crystallized structure. This is an irreversible process, and by heating metallic glass to room temperature, i[...]

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