Thermal Stability and Mechanism of Thermally Induced Crystallization of Fe73.5Cu1Nb3Si15.5B7 Amorphous Alloy

0463855 - ÚFM 2017 RIV PL eng J - Journal Article
Vasić, M. - Minić, Dušan M. - Blagojević, V. A. - Žák, Tomáš - Pizúrová, Naděžda - David, Bohumil - Minić, Dragica M.
Thermal Stability and Mechanism of Thermally Induced Crystallization of Fe73.5Cu1Nb3Si15.5B7 Amorphous Alloy.
Acta Physica Polonica A. Roč. 128, č. 4 (2015), s. 657-660. ISSN 0587-4246. E-ISSN 1898-794X.
[ISPMA 2014 - International Symposium on Physics of Materials /13./. Praha, 31.08.2015-04.09.2015]
R&D Projects: GA MŠMT(CZ) ED1.1.00/02.0068
Institutional support: RVO:68081723
Keywords : activation energy * metallic glasses * kinetic analysis
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 0.525, year: 2015

Investigation of thermal stability of the alloy revealed stepwise crystallization process, manifested by two distinct complex exothermic peaks in differential scanning calorimetry curves. Kinetic parameters of individual crystallization steps were found using the Kissinger and Vyazovkin methods. Structural characterization of thermally treated samples showed formation of different iron-based phases including alpha-Fe(Si), Fe2B, Fe16Nb6Si7 and Fe 2 Si and some metastable intermediary species. Morphology characterization of the surface and cross-section of the thermally treated samples showed granulated structure composed of several different phases and indicated occurrence of impingement effects during crystal growth. Value of estimated lifetime suggested very high stability against crystallization at room temperature and abrupt decrease of lifetime with temperature increase.
Permanent Link: http://hdl.handle.net/11104/0262962