2018-Sustainable Industrial Processing Summit
SIPS2018 Volume 5. Zehetbauer Intl. Symp. / SISAM
| Editors: | F. Kongoli, S. Kobe, M. Calin, J.-M. Dubois, T. Turna |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2018 |
| Pages: | 154 pages |
| ISBN: | 978-1-987820-90-4 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Relaxation of Bulk Metallic Glasses After Cryogenic High Pressure Torsion
Florian Spieckermann1; Baran Sarac2; Erhard Schafler3; Viktor Soprunyuk2; Michael Kerber4; Jozef Benarczik5; Juergen Eckert2;1UNIVERSITY OF LEOBEN, Leoben, Austria; 2ERICH SCHMID INSTITUTE OF MATERIALS SCIENCE, Leoben, Austria; 3UNIVERSITY OF VIENNA, Wien, Austria; 4UNIVERSITY OF VIENNA, Vienna, Austria; 5DEUTSCHES ELEKTRONEN SYNCHROTRON DESY, Hamburg, Germany;
Type of Paper: Regular
Id Paper: 446
Topic: 42
Abstract:
Bulk metallic glasses (BMG’s) combine high strength, hardness and elastic strain limit, they may show good soft-magnetic properties and excellent corrosion resistance as well as high homogeneity and isotropy. The viscous flow workability in the supercooled liquid region makes metallic glasses an excellent candidate for the next generation engineering materials. However, the limited ductility of BMG’s is detrimental for many potential applications. Recent results indicate that structural relaxations on the nanometer scale and their percolation may be involved in the formation of shear transformation zones (STZ) and shear bands that control the ductility of BMG’s. Considerable effects of aging/rejuvenation of BMG’s on their mechanical properties and on structural and dynamic relaxations were reported. Hence, there is fundamental scientific interest in understanding the interplay of structural and dynamic relaxations for equilibrated as well as non-equilibrated BMG’s. In the present study we use in-situ X-ray diffraction to study the structural rearrangements during annealing from 77 K up to the crystallization temperature of CuZr based BMG’s brought out of equilibrium by high pressure torsion performed at cryogenic temperatures. These structural changes are correlated with dynamic mechanical analysis (DMA) and differential scanning calorimetry to determine dynamic relaxations as well as crystallization.