Abstract
The strain γ processing at high-pressure torsion (HPT) deformation for many hard materials is really much smaller than expected. This is a result of slippage of sample surface and surface of anvils. In this context, the authors develop a new method- “accumulative high-pressure torsion” (ACC HPT). This method enables producing much higher true strains in metallic and alloys than the traditional HPT method. HPT and ACC HPT were applied to β-Ti-alloys Ti-18Zr-15Nb. As TEM studies showed, the size of grains after HPT n = 10 revolutions is about 40 nm while the size of grains after ACC HPT with n = 10 revolutions (in total) is about 20 nm.
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