Abstract
Dynamic channel-angular pressing of titanium at a temperature of 500°C has been performed. An increase in the temperature prevented the formation of cracks and adiabatic-shear bands that usually occur upon pressing at room temperature. As a result of dynamic pressing of titanium at 500°C, there is obtained a structure which represents a dispersed mixture of fine recrystallized grains and unrecrystallized regions (duplex structure). The formation of recrystallized grains is caused by a local increase in the temperature in the sites of deformation localization and is a mechanism of relaxation of accumulated stresses. The recrystallized grains are grouped into inclined extended shear bands (large-scale relaxation) and into short bent chain of clusters, which are located between inclined bands (small-scale stress relaxation). The unrecrystallized regions consist predominantly of elongated subgrains formed as a result of deformation and dynamic polygonization. The microhardness of titanium in the recrystallized regions is equal to 1980 MPa, that in unrecrystallized regions, to 2150 MPa.
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