Thermally Induced Structural Transformations of Fe 40 Ni 40 P 14 B 6 Amorphous Alloy
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E their discovery, more than fifty years ago, amorphous alloys (metallic glasses) have been attracting great scientific interest because of their favorable magnetic, electrical, mechanical and chemical properties.[1–7] Lack of long-range atom ordering produces isotropic structure, leading to isotropic physical and mechanical properties. These properties, including glass forming ability, depend mostly on its chemical composition. In Fe-based amorphous alloys, addition of metalloid amorphizers and substitution of Fe by Co and Ni were found to improve glass forming ability, while addition of small amounts of rare-earth elements brings about an increase in Curie temperature.[8–11] Amorphous alloys are thermodynamically and kinetically metastable, striving to stabilize through different processes at high pressure or temperature or during prolonged use at moderate temperature. These processes include structural relaxation, crystallization, and recrystallization and can result in deterioration of technologically important properties, or, on the other hand, can yield a material containing MILICA M. VASIC´, Researcher, is with the Faculty of Physical Chemistry, University of Belgrade, Belgrade, Serbia. PAVLA ROUPCOVA´, NADEˇZˇDA PIZU´ROVA´, and TOMA´Sˇ ZˇA´K, Senior Researchers, are with the CEITEC IPM, Institute of Physics of Materials AS CR, Brno, Czech Republic. SANJA STEVANOVIC´, Researcher, is with the Institute for Chemistry, Technology and Metallurgy, University of Belgrade, Belgrade, Serbia. VLADIMIR A. BLAGOJEVIC´, Researcher, is with the Institute of Technical Sciences, Serbian Academy of Sciences and Arts, Belgrade, Serbia. DRAGICA M. MINIC´, Full Professor, is with the Department of Biochemical Sciences, State University in Novi Pazar, Novi Pazar, Serbia. Contact e-mail: dminic@ffh.bg.ac.rs Manuscript submitted April 28, 2015. Article published online November 12, 2015 260—VOLUME 47A, JANUARY 2016
nanocrystals embedded in amorphous matrix, which manifests better functional properties than purely amorphous or crystalline materials.[12,13] As the detailed knowledge of microstructure and morphology of processed amorphous alloys has an important role in creating materials with targeted properties, these characteristics are often included in research concerning amorphous and nanocrystalline alloys.[14–16] Numerous studies performed on systems containing Fe, Si, B revealed a-Fe or a-Fe(Si) as the main crystallization product, while varying content of other crystalline phases, such as Fe2B, Fe3B or Fe23B6, were also observed.[4,14,17] Crystal morphology obtained by thermally induced crystallization can be greatly influenced by the temperature and duration of thermal treatment, like in amorphous Fe83B17 alloy, where dendritic crystal morphology was observed after heating at 680 K (407 °C) for 1 minute, while a spherical one was observed after heating at 580 K (307 °C) for 4 hours.[18] Amorphous alloy Fe40Ni40P14B6, also known under the trade name Metglas 2826, has been extensively studied due to potential application in senso
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