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Akopov F.Kh.,Andronikashvili Institute of Physics | Chkhartishvili I.V.,Tavadze Institute of Metallurgy and Materials Science | Galustashvili M.V.,Andronikashvili Institute of Physics | Driaev D.G.,Andronikashvili Institute of Physics | And 2 more authors.
Physics of Metals and Metallography | Year: 2010

Ti-Al and Ti-Al-Co metal composites have been produced by shock-wave compaction using hexogen and ammonite explosives. The microstructure, microhardness, and temperature spectra of the real part of the complex magnetic susceptibility X'(T) have been studied. The measurements have been performed in the course of isochronal annealings of the samples at temperatures progressively increasing in steps of 50 K. The values of X', which correspond to the isothermal sections of the spectra at 140 K and 400 K, as a function of the isochronal annealing temperature, X'(T), have the form of asymmetrical bell-shaped curves. The maxima of these curves are in the region of the temperature of the α → β polymorphic transformation of cobalt. Possible reasons for this behavior of X' have been discussed. © Pleiades Publishing, Ltd., 2010. Source


Oniashvili G.Sh.,Tavadze Institute of Metallurgy and Materials Science | Aslamazashvili Z.G.,Tavadze Institute of Metallurgy and Materials Science | Zakharov G.V.,Tavadze Institute of Metallurgy and Materials Science | Tavadze G.F.,Tavadze Institute of Metallurgy and Materials Science | And 3 more authors.
International Journal of Self-Propagating High-Temperature Synthesis | Year: 2013

Fine-grained composites with high impact resistance (intentionally armor plates) were prepared from inexpensive raw materials by forced SHS compaction in the Ti-B-N-Cu (I) and Ti-B-N-C-Cu (II) systems ([Cu] = 0-10 wt %). The materials synthesized under optimized conditions were practically pore-free compacts with the following parameters: porosity 0.4-1.2%; hardness 91.5-92.5 and 92.3-93.3 HRA; density 4.3-4,4 and 4.5-4.7 g/cm3, for systems I and II respectively. The materials were found to withstand impacts with an energy of 18000-20000 J (for materials with d = 6.8-6.5 g/cm2). © 2013 Allerton Press, Inc. Source


Kecskes L.,U.S. Army | Butler B.,U.S. Army | Oniashvili G.,Tavadze Institute of Metallurgy and Materials Science | Aslamazishvili Z.,Tavadze Institute of Metallurgy and Materials Science | And 2 more authors.
Materials and Manufacturing Processes | Year: 2011

Bi- and trilayer composites of titanium aluminides (Ti-Al) and substoichiometric titanium boride (TiB0.6) have been fabricated from green compacts placed under pressure. Ti-Al blends with ratios of 3:1, 1:1, or 1:3 have been prepared by ball milling. Subsequent to the preparation of the precursor blends, plate-shaped green compacts of Ti-Al and Ti-B0.6 were pressed at room temperature. Green compacts were stacked in a layered geometry and were heated rapidly under a static pressure of about 10bar. After the temperature reached 1300-1400°C, the Ti-Al and TiB0.6 phases were synthesized by the conversion of the reactants into the product phases (also known as "thermal explosion" processing) and simultaneously consolidated and joined under a pressure of 80-100bar. Scanning electron microscopy (SEM) examination showed that the Ti-Al layer was highly heterogeneous, and the extent of heterogeneity depended strongly on the respective elemental ratio of Ti to Al. Furthermore, the conversion from reactants to products was found to be determined by the overall heat available during the thermal explosion processing step. Unlike the Ti-Al, the TiB 0.6 layer was more uniform; however, the combination of heat and pressure was found to be insufficient to fully densify the aluminide layer. These and other features of the layered intermetallic structures will be discussed. Copyright © Taylor & Francis Group, LLC. Source


Oniashvili G.S.,Tavadze Institute of Metallurgy and Materials Science | Tavadze G.F.,Tavadze Institute of Metallurgy and Materials Science | Aslamazashvili Z.G.,Tavadze Institute of Metallurgy and Materials Science | Zakharov G.V.,Tavadze Institute of Metallurgy and Materials Science
International Journal of Self-Propagating High-Temperature Synthesis | Year: 2015

Suggested is a process, combination of thermal explosion (TE) with forced compaction (FC) termed TE-FC process, for synthesis of single-phase fine-grained pore-free compacts in the Ti-Al system. The TE-FC technique can be readily recommended for practical implementation. © 2015, Allerton Press, Inc. Source

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