Open AccessSlippage during high-pressure torsion of commercially pure titanium and application of accumulative HPT to it
Author(s) -
D. V. Gunderov,
Anna Churakova,
Alfred V. Sharafutdinov,
В. Д. Ситдиков,
В. В. Астанин
Publication year - 2022
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1213/1/012003
Subject(s) - torsion (gastropod) , slippage , materials science , titanium , high pressure , severe plastic deformation , composite material , shear (geology) , metallurgy , thermodynamics , microstructure , surgery , physics , medicine
A new efficient method was used to find that in the case of high-pressure torsion of commercially pure titanium, accumulation of shear strain in Ti does not occur due to slippage of anvils. Despite this, micro-hardness increases as the number of turns n increases, and Ti structure is refined more intensively. High-pressure torsion is accompanied by a high-pressure ω-phase formation. However, the content of ω-phase changes non-monotonously with an increase in the number of turns. First, while number of turns is less than n=5, the ω-phase content reaches 50%. Upon further deformation, the ω-phase content decreases to 15% for n=20. A new accumulative high-pressure torsion method is applied to commercially pure titanium for the first time. Accumulative high-pressure torsion leads to the strongest transformation of the structure and an increase in hardness, since stronger real deformation occurs due to composition of compression and torsion strain cycles.