2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 5: Composite, Ceramic, Quasi-crystals, Nanomaterials & Coatings
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 578 pages |
| ISBN: | 978-1-987820-07-2 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Preparing the Melt for the Amorphous State, Aimed at Producing Nanocrystal Materials Possessing Improved Magnetic Properties
Vladimir Tsepelev1; Vladimir Belozerov2; Yuri Starodubtsev2; Viktor Konashkov1; Vladimir Vyukhin1; Ann Latypova1;1BORIS YELTZIN URAL FEDERAL UNIVERSITY, Ekaterinburg, Russian Federation; 2GAMMAMET RESEARCH & PRODUCTION ENTERPRISE, Ekaterinburg, Russian Federation;
Type of Paper: Regular
Id Paper: 80
Topic: 6
Abstract:
G. Stewart's sibotaxes are prominent among the quasi-crystal theories. More recently, an equivalent term "cluster" was coined. The following example is of particular interest for metallurgists. The icosahedronic symmetry is observed in the recently discovered (1984) state of a substance possessing a special type of the long-range order, the state being referred to as quasi-crystal.
First, it was discovered by D. Shechtman in the Al-Mn melts, then in many other metal melts after quench hardening. The materials possessing similar structure were also termed as "shechtmanit". The fact that the quasi-crystal state is fixed as a result of melt rapid quenching is an evidence of the atoms being put in such order.
The concept of the quasi-chemical model of the liquid micro-non-uniform composition is being developed under the supervision of B.A. Baum in our laboratory. According to it, the metal melt consists of space areas (groups, sibotaxes or clusters) within which the atom arrangement is characterized by certain ordering "short-range" order.
The unique technology of the melt time-temperature treatment has been developed taking into account the above concept and research made on the physical properties of the metal- and cobalt-based melts being crystallized. Amorphous ribbons produced with this technology require optimal annealing temperatures to be specifically selected.
The results of studying nano-crystal magnetic circuits' properties and their structure in the course of annealing at temperatures below and above the optimal one are presented.
The proposed approaches, which are scientifically justified, enabled producing magnetic soft nano-crystal magnetic circuits possessing an extremely low coercive force (about 0,1 A/m) and high initial magnetic permeability (about 200 000) with the saturation magnetic induction of 0,4 T. The maximum relative magnetic permeability is less than 600 000.