Abstract
The effect of Si3N4 addition on the mechanical properties and microstructure of Ti-Al-Zr-Sn based near-α Ti alloys has been systematically investigated at both room temperature and high temperature (650°C). Minor Mo and Ta (β stabilizing elements) together with Si3N4 addition have significantly improved the compressive yielding strength at both room temperature and 650°C. The strengthening effect was mainly due to the precipitation of TiN, α2-Ti3Al and the retained β phase. High compressive yielding strength together with pronounced ductility can be obtained by only adding minor Si3N4 into Ti-Al-Zr-Sn alloys. The enhanced ductility is probably due to the depression of the brittle α2 intermetallic phase, which did not precipitate out even after long time ageing (750°C for 500h).
Original language | English |
---|---|
Pages (from-to) | 131-139 |
Number of pages | 9 |
Journal | Materials Science and Engineering A |
Volume | 625 |
DOIs | |
Publication status | Published - 2015 Feb 1 |
Keywords
- Compression test
- Microstructure
- Scanning electron microscopy (SEM)
- Ti-alloy
- Transmission electron microscopy (TEM)
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering