2017-Sustainable Industrial Processing Summit
SIPS 2017 Volume 5. Marquis Intl. Symp. / New and Advanced Materials and Technologies
| Editors: | Kongoli F, Marquis F, Chikhradze N |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2017 |
| Pages: | 590 pages |
| ISBN: | 978-1-987820-69-0 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
CD shopping page
Predicting Glass-forming Ability in Bulk Metallic Alloys
Valeriy Sidorov1;1URAL STATE PEDAGOGICAL UNIVERSITY, Ekaterinburg, Russian Federation;
Type of Paper: Regular
Id Paper: 219
Topic: 43
Abstract:
Bulk amorphous metallic alloys are beginning to be used due to their unique mechanical, corrosion, and magnetic properties. However, the existing criteria of glass forming ability (GFA) cannot predict in advance the tendency to amorphization nor the influence of doping elements on it. Moreover, these criteria can be calculated only when amorphous alloy is prepared, and its kinetic of crystallization is examined. It becomes necessary to introduce a new criterion, that includes information about the melt before quenching.
In this regard, the influence of Ga, Zr, Sn and Sb in small additions on GFA of CoFeNbBSi metallic alloys, with different compositions of the base elements have been investigated. The bulk metallic glasses in the form of rods with diameter of 1 - 4 mm were prepared by the cast suction method and by melt injection into water cooled copper mold. The research has been carried out by means of X-ray diffraction, TEM and DSC studies, as well as electrical resistance and magnetic susceptibility measurements in crystal and liquid states. The additions of Ga and Zr were found to improve glass forming ability of the alloys, whereas Sn and Sb additions decrease it. It was shown that the paramagnetic Curie temperature in the melt is able to describe quantitatively the influence of the additions: in case the addition increases it, the GFA improves.