Open Access Conference Proceedings

The purpose of this work is to investigate the structure formation in intermetallic γ-TiAl alloys by using a complex plastic deformation technology under non-stationary temperature conditions with niobium doping. Also in given work, the using of Hall-Patch model, the interrelation of the nanostructured quantities with strength characteristics is considered. It allows to obtain materials with increased plasticity by an optimal combination of mechanical properties over a wide range of temperatures. The paper considers the influence of the stress-strain state of the formation structure and properties of γ-TiAl alloys obtained under thermochemical pressing, with the help of computer modeling program Deform. The process of extrusion rods is characterized by uniform compression stress, which provides γ-TiAl alloys best in these conditions’ plastic properties. It was shown that high-temperature synthesis intermetallic γ-TiAl compounds in the powder mixture in a pure elements SHS intermetallic compression allows to obtain an alloy having an average grain size of about 30 microns. An increase in the degree of plastic deformation of the intermetallic product synthesized under pressure in the conditions of the thermochemical pressing allows to reduce the size of the grain in the final product by an order of magnitude and even to form a sub-microcrystalline granular structure in the intermetallic alloy.

Keywords: Metal forming, intermetallic alloy, thermochemical pressing, grain size, properties, structure

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