| Issue |
MATEC Web Conf.
Volume 321, 2020
The 14th World Conference on Titanium (Ti 2019)
|
|
|---|---|---|
| Article Number | 11060 | |
| Number of page(s) | 5 | |
| Section | Microstructure - Properties Relationships | |
| DOI | https://doi.org/10.1051/matecconf/202032111060 | |
| Published online | 12 October 2020 | |
Thermal Stability and Recrystallization of Titanium Grade 4 with Ultrafine-Grained Structure
1 Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, 12 K. Marx St., Ufa, 450008, Russia.
2 Belgorod National Research University, Pobeda 85, Belgorod, 308015, Russia
* Email:dgr84@mail.ru
The paper examined annealing behavior of ultrafine-grained Ti Grade 4. The ultrafine-grained microstructure was produced by equal-channel angular pressing (ECAP) technique by using a Conform scheme and was characterized by a mean grain size of d=0.3 μm and non-equilibrium grain boundaries. The ultrafine-grained structure was found to be stable up to 400°C. The excellent thermal stability was attributed to a strain-ageing, i.e., the enhanced diffusion of interstitial solutes resulting in a formation of solute atmospheres at/near grain boundaries and dislocations. At 450–500°C, a rapid growth of strain-free grains was observed to occur. This process eliminated severely-deformed microstructure and gave rise to abrupt material softening. A further increase of the annealing temperature above 600°С resulted in precipitation of lenticular dispersoids as well as iron-rich globular β-particles. This surprising phenomenon promoted a subtle hardening effect.
© The Authors, published by EDP Sciences, 2020
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