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Tenth Young Researchers Conference – Materials Science and Engineering December 21-23, 2011, Hall 2, SASA, Knez Mihailova 35 & 36, Belgrade, Serbia III/3 Mechanochemical synthesis Ba 0.8 Sr 0.2 TiO 3 Darko Kosanović 1 , Suzana Filipović 1 , Miodrag Mitrić 2 , Smilja Marković 1 , Nina Obradović 1 , Aleksa Maričić 3 , Vladimir Pavlović 1 , Јelena Živojinović 1 , Momčilo M. Ristić 4 , Milan Dukić 5 1 Institute of Technical Sciences of SASA, Belgrade, Serbia, 2 The Vinča Institute of Nuclear Scineces, Condensed Matter Physics Laboratory, Belgrade, Serbia, 3 Technical Faculty Čačak, Čačak, Serbia, 4 Serbian Academy of Sciences and Arts, Belgrade, Serbia, 5 North Carolina Central University Durham, USA Ba 0.8 Sr 0.2 TiO 3 was prepared from the starting materials BaCO 3 , SrCO 3 and TiO 2 through solid state reaction. Mixture of these oxides was mechanically activated using a high-energy ball mill at different time intervals from 0 to 120 minutes. The crystal structure was determined by X-ray diffraction to obtain information about the composition of phase variation. It was observed that after 40 minutes occurred early synthesis Ba 0.8 Sr 0.2 TiO 3 . Particle size distribution along with scanning electron microscopy gave very useful information about powder morphology. 13
Tenth Young Researchers Conference – Materials Science and Engineering December 21-23, 2011, Hall 2, SASA, Knez Mihailova 35 & 36, Belgrade, Serbia III/4 Mechanomaking of boron crystal solid solution in fcc Fe-Ni alloys A. Litvinov, Kirill Lyashkov, V. Shabashov, N. Kataeva Institute of Metal Physics UB RAS, Yekaterinburg, Russia Boron does not form equilibrium solid solutions with iron. Using the method of ultra speed quenching (SQ) it is possible to obtain metastable solid solutions and to widen the area of their existence. As alternative to SQ, this research studied the possibility of mechanical dissolution of borides and formation of boron solid solutions in fcc Fe-Ni alloys using intensive cold plastic rotation deformation in Bridgman anvils. To analyse the process of solid solutions formation, as in cases with carbon, nitrogen, and oxygen, it is necessary to take into account the dependent on temperature competitive processes of decay and extraction of secondary phases – borides in this case. According to the data of Mossbauer spectroscopy, magnetic susceptibility and X-ray diffraction analysis the deformation-induced dissolution of boron and boron nitride particles in metal matrix under compression shear in rotating Bridgman anvils was stated. Boron interstitial supersaturated solid solution with concentration 1…3 at.% is formed as a result of dissolution of Fe-Ni alloy in fcc matrix. Supersaturated solid solution is unstable and coexists with metastable borides of (FeNi) 3 B type. The possibility of formation of supersaturated crystal boron solid solutions in fcc - iron ( to 3 at.% B) is promoted by the anomalously large growth of crystal lattice spacing and the volume of octahedral interstitial sites of γ-phase in the invar area of compositions. The growth of and T C , found with the help of NRG method, in Fe-Ni alloy of invar range at its mechanical synthesis with boron-containing components is comparable with the similar growth of these magnetic characteristics for the cases of alloying with carbon and nitrogen. Electron microscopy data show the formation of submicrostructure in invar matrix with multiple nanodimensional particles of boride phases and inclusions of undissolved boron. Mechanical synthesis of supersaturated boron solid solution in crystal matrix of Fe-Ni austenite makes it possible to use cold plastic compression shear deformation for nanostructurization and creation of secondary nanoboride phases. 14
Page 1 and 2: TENTH YOUNG RESEARCHERS' CONFERENCE
Page 3 and 4: Book title: Tenth Young Researchers
Page 5 and 6: Tenth Young Researchers Conference

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