Abstract
The influence of Sn composition in Ti-17 at% Nb alloys is studied by cyclic tension and in-situ synchrotron X-ray diffraction. It is firstly found that Sn stabilizes β-phase and effectively suppresses the formation of ω-phase. Along with β-phase stability, we observe lowering of the austenite and martensite transformation temperature by ~100 K/at% and 88 K/at%, respectively. Increasing Sn decreases the martensitic transformation strain in Ti-Nb alloys by ~1.4%/at%, larger than that in Ti-Zr-Nb-Sn systems. The influence of Sn in martensitic Ti is anisotropic: causing larger reduction in lattice parameter b and higher decreases in elastic moduli of grain families that are aligned close to the b-axis. Finally, a {013}α ″, {031}α″,{122}α″ and {211}α″ quadruple texture was observed in martensitic Ti wire. At the early stage of deformation, detwinning quickly rotated {013}α″ and {211}α″ towards {031}α″ and {122}α″ components. After that, the strength of {031}α″ continued to increase, while the strength of {122}α″ texture was gradually decreased by dislocation slip as deformation continued.
| Original language | English |
|---|---|
| Pages (from-to) | 764-772 |
| Number of pages | 9 |
| Journal | Materials Science and Engineering: A |
| Volume | 743 |
| DOIs | |
| Publication status | Published - 16 Jan 2019 |
Keywords
- Detwinning
- Martensitic Ti
- Phase transformation
- Synchrotron
- Texture