A. A. Popov*, R. Z. Valiev**, I. Yu. Pyshmintsev*, S. L. Demakov*, and A. G. Illarionov*
* Ural State Technical University, ul. Mira 19, Ekaterinburg, 620002 Russia
** Ufa State Aviation Technology University, ul. K. Marksa 12, Ufa-Center, 450000 Bashkortostan, Russia
Received June 5, 1996; in final form, December 27, 1996
Abstract—The paper sums up a study of how the amount of strain affects the grain size and properties of the
VT1-0 titanium alloy. It is established that severe torsional plastic deformation can produce in the alloy a struc-
ture with an average grain size of 100 nm and with regions where the grain size is 20–30 nm. The manner in
which post-deformation heating affects the structure and properties of the alloy is investigated. Structural
changes on heating are found to occur in two basic stages, low-temperature and high-temperature. The low-tem-
perature transformation proceeds at a rather high rate and consists a redistribution of dislocations and stresses.
The high-temperature transformation, which commences at 300–350°C, involves grain growth. The deformed
nanostructured titanium is found to have a high strength, but its yield limit and microhardness behave differ-
ently with temperature. This might be related to the difference in how strain hardening proceeds in the deformed
and annealed states. Nanostructured titanium exhibits the best package of properties, including a high strength
and a high plasticity, when it has been annealed at 250°C.
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