T. Melor, M. Okrosashvili, Georgian State Technical University, Tbilisi, Georgia
The objective of the investigation is to study transition zone and microstructures formed through condensation of titanium stream on the cupper backing and reaction diffusion; development of possible mechanism of phase formation, that can explain regularities of structure formation in transition zone.
Specimens for investigation were obtained in the electron-beam installation. Structure analysis and study of the character of elements distribution over a cross-section area were performed by metallographic and scanning electron microscopes and micro-roentgen spectral analyzer. X-ray structural analysis by means of defractometers.
It has been studied structures of constituents, phase composition and character of relative positions (mutual arrangement) in the Cu-Ti transition zone formed due to condensation of vapour stream and reaction diffusion.
It is shown that constituents of presented phases and structures are formed as continuous and consequently interchangeable zones from the vapour phase according to rising the concentration of the components. It is shone existence of high-temperature phase and non-equilibrium evtectic (ζ+ λ) in the transition zone and possibility of formation of TiCu8 (a new phase) with titanium content of 10,49 atomic percent. Metastable phase exists as stable compound. Two main mechanism of phase formation is suggested that can explain terms of formation of interchangeable zone.
It is ascertained regularity of phase formation in the transition zone at condensation of titanium vapour on the copper backing and reaction diffusion. On the base of generalization of the experimental results it is suggested the mechanism that explains phase formation.
Key words: vapour, condensation, transition zone, phase formation, structure, mutual arrangement, relative position, interchangeable zone, reaction diffusion, copper backing.
Summary: M. Okrosashvili,E. Kutelia, T. Makharadze, Z. Parchukashvili, A. Peikrishvili
77 Kostava st., Tbilisi 0175, Georgia.
Georgian Technical University, chair of materials Science and Metal Technology.
Tel: + (995 32) 334921
E-mail: mokrosashvili@yahoo.com.
The objective of the investigation is to study transition zone and microstructures formed through condensation of titanium stream on the cupper backing and reaction diffusion; development of possible mechanism of phase formation, that can explain regularities of structure formation in transition zone.
Specimens for investigation were obtained in the electron-beam installation. Structure analysis and study of the character of elements distribution over a cross-section area were performed by metallographic and scanning electron microscopes and micro-roentgen spectral analyzer. X-ray structural analysis by means of defractometers.
It has been studied structures of constituents, phase composition and character of relative positions (mutual arrangement) in the Cu-Ti transition zone formed due to condensation of vapour stream and reaction diffusion.
It is shown that constituents of presented phases and structures are formed as continuous and consequently interchangeable zones from the vapour phase according to rising the concentration of the components. It is shone existence of high-temperature phase and non-equilibrium evtectic (æ+ ) in the transition zone and possibility of formation of TiCu8 (a new phase) with titanium content of 10,49 atomic percent. Metastable phase exists as stable compound. Two main mechanism of phase formation is suggested that can explain terms of formation of interchangeable zone.
It is ascertained regularity of phase formation in the transition zone at condensation of titanium vapour on the copper backing and reaction diffusion. On the base of generalization of the experimental results it is suggested the mechanism that explains phase formation.
Key words: vapour, condensation, transition zone, phase formation, structure, mutual arrangement, relative position, interchangeable zone, reaction diffusion, copper backing.
