Low Temperature Physics: 38, 980 (2012); https://doi.org/10.1063/1.4758787 (9 pages)
Fizika Nizkikh Temperatur: Volume 38, Number 10 (October 2012), p. 1240-1250    ( to contents , go back )

Structure homogeneity of nanocrystalline titanium VT1-0. Low-temperature micromechanical properties

A.V. Rusakova, S.V. Lubenets, L.S. Fomenko, and V.A. Moskalenko

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: lubenets@ilt.kharkov.ua

Received March 30, 2012

Abstract

Microhardness of the titanium VT1-0 samples with a grain size of 35 nm to 10 μm was measured over the temperature range 77–300 K. It is shown that the nanocrystalline samples produced by rolling at low temperature are sufficiently homogeneous and their structure is stable to thermal and mechanical effects. The interrelation between microhardness and grain size is described well by the Hall–Petch law the parameters of which depend on temperature. The temperature dependences of microhardness and Hall– Petch constant suggest that the microplastic deformation of titanium is of a thermally activated character and a dislocation nature no matter what the grain size is.

PACS: 81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization;
PACS: 62.20.Qp Friction, tribology, and hardness;
PACS: 68.35.Gy Mechanical properties; surfacestrains.

Key words: titanium VT1-0, rolling at low temperature, nanocrystalline titanium, homogeneity of structure, microhardness, Hall-Petch law, thermally activated plasticity.

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