Thermal Stability and Recrystallization of Titanium Grade 4 with Ultrafine-Grained Structure
| Autor: | Sergey Mironov, G.S. Dyakonov, Tatyana Vitalyevna Yakovleva, Irina P. Semenova |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Pressing Materials science chemistry.chemical_element Recrystallization (metallurgy) 02 engineering and technology Engineering (General). Civil engineering (General) 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Grain size chemistry 0103 physical sciences Grain boundary Thermal stability TA1-2040 Composite material 0210 nano-technology Softening Titanium |
| Zdroj: | MATEC Web of Conferences, Vol 321, p 11060 (2020) |
| ISSN: | 2261-236X |
| DOI: | 10.1051/matecconf/202032111060 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|