Thermal Stability and Structural Relaxation Kinetics of Commercially Pure Titanium

Y. Semerenko; N. Galtsov; D. Hurova; T. Bednarchuk; P. Zinoviev; V. Zoryansky; V. Moskalenko; R. Smolianets; A. Smirnov; Y. Pohribna; N. Aksenova

arXiv · 2610.40737

Thermal Stability and Structural Relaxation Kinetics of Commercially Pure Titanium

Y. Semerenko·N. Galtsov·D. Hurova·T. Bednarchuk·P. Zinoviev·V. Zoryansky·V. Moskalenko·R. Smolianets·A. Smirnov·Y. Pohribna·N. Aksenova

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Abstract

This work explores the structural relaxation of cryorolled commercially pure titanium subjected to subsequent annealing.Nanostructured specimens with an average grain size of ~50 nm were produced by plastic deformation via cryogenic rolling at 100 K to a true strain of 1.20, followed by annealing at 425 K, 525 K, 725 K, and 945 K. Microstructural evolution was examined using electron microscopy and X-ray diffraction. Cryogenic rolling was found to induce pronounced grain fragmentation, with coherent scattering regions (CSRs) of 30-50 nm dominating the substructure. X-ray diffraction analysis revealed that annealing drives crystallite growth: a slight increase at 525 K, accelerated coarsening at 725 K, and complete recrystallization at 945 K. The kinetics of grain growth follow the classical Lifshitz-Slyozov-Wagner model, with a growth exponent of ~4, reflecting the role of triple junctions and defect-controlled boundary diffusion. The activation energy, estimated at ~97 kJ/mol, corresponds to typical values for grain boundary diffusion in α-Ti, confirming that cryogenic deformation produces a highly non-equilibrium microstructure whose relaxation is strongly temperature dependent.

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Y. Semerenko, N. Galtsov, D. Hurova, T. Bednarchuk, P. Zinoviev, V. Zoryansky, V. Moskalenko, R. Smolianets, A. Smirnov, Y. Pohribna, N. Aksenova. 2026-10-29. Thermal Stability and Structural Relaxation Kinetics of Commercially Pure Titanium. https://arxiv.org/abs/2610.40737

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