Reshetov A. Developing of theory and technology of billets with high level of stress-strain properties making on basis of twist extrusion process

The object of research: severe plastic deformation processes for getting of billets with high level of stress-strain properties. The aim of reasearch: commercial pure titanium and secondary aluminium alloy with high level of stress-strain properties getting on the basis of twist extrusion theory and technology developing and application of twist extrusion in combination with others metal forming processes. The mechanism of metal flow during the twist and spread extrusions (TE and SE) was studied. The method of visioplasticity has got further development in application to the metal flow study during the TE. The proposed method was used for the estimation of the strained state of billet during TE. Modernization of TE installation was realized. Force parameters of process using different lubrications were studied. The results of the thesis were used for the designing of TE operation as a main part of plates making technology. These plates made of commercial pure titanium are used in traumatology and orthopedy. The results of the work are also used for the secondary aluminium alloy AK9 deformation processes development. Field of application - medicine, metallurgy, construction.