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Popov V.V.,Donetsk Physics and Engineering Institute of NAS of Ukraine | Tkatch V.I.,Donetsk Physics and Engineering Institute of NAS of Ukraine | Rassolov S.G.,Donetsk Physics and Engineering Institute of NAS of Ukraine | Aronin A.S.,RAS Institute of Solid State Physics
Journal of Non-Crystalline Solids | Year: 2010

Effects of full replacement of Ni by Co in the well-known Fe 40Ni40P14B6 glass on thermal stability and structure of fully crystallized samples were investigated by differential scanning calorimetry and transmission electron microscopy. Both glasses crystallize via the same eutectic mode however the crystallization temperatures of the Fe40Ni40P14B6 glass are about 60 K higher. Kinetics of eutectic crystallization of amorphous alloys at constant rate heating and structure of crystallized samples havebeen investigated by differential scanning calorimetry and transmission electron microscopy, respectively. The values of the specific free energy of the crystal/glass interface and the effective interfacial diffusion coefficient, which define the crystal nucleation and growth in these glasses, were extracted from both the kinetic and structural data using the earlier proposed method. The obtained results showed that the enhanced thermal stability of the Fe 40Ni40P14B6 glass was caused mainly by the essential lowered values of crystal growth rate. © 2010 Elsevier B.V. All rights reserved.


Tkatch V.I.,Donetsk Physics and Engineering Institute of NAS of Ukraine | Rassolov S.G.,Donetsk Physics and Engineering Institute of NAS of Ukraine | Popov V.V.,Donetsk Physics and Engineering Institute of NAS of Ukraine | Maksimov V.V.,Donetsk Physics and Engineering Institute of NAS of Ukraine | And 5 more authors.
Journal of Non-Crystalline Solids | Year: 2011

Kinetics of the first crystallization stage of Al86Ni 2Co5.8Gd5.7Si0.5 amorphous alloy and structure of the partially crystallized specimens were investigated by measurements of electrical resistance, X-ray diffraction and transmission electron microscopy. The presence of Al nanocrystals and eutectic colonies consisted of mutually oriented crystals of Al and metastable phase was found. The transient nucleation and slowing-down diffusion-limited growth and the interface-controlled growth of the quenched-in nuclei were identified as mechanisms of formation of the Al nanocrystals and eutectic colonies, respectively. © 2011 Elsevier B.V. All rights reserved.

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