Abstract
In this paper, the ageing response and the mechanical properties of Ti-5553 (Ti-5Al-5V-5Mo-3Cr) and Ti-5553s (Ti-5Al-5V-5Mo-3Cr-0.4Si) alloys are comparatively investigated. During ageing at 650. °C, the hardness of the alloys first increases in 30. min and remains constant from 1. h to 8. h, and then decreases with further increase the ageing time to 29. h. This variation is related to the chemical composition and the volume fraction of α phase. The mechanical properties of the 5. h aged Ti-5553 and Ti-5553s alloys are investigated, and the result shows that the ultimate tensile strength of the Ti-5553s alloy is higher than that of Ti-5553 alloy while the ductility of the Ti-5553s alloy slightly decreases. The tensile fracture of the Ti-5553s alloy shows a mixed model of intergranular fracture and cleavage fracture.
| Original language | English |
|---|---|
| Pages (from-to) | 460-467 |
| Number of pages | 8 |
| Journal | Materials Science and Engineering: A |
| Volume | 561 |
| DOIs | |
| State | Published - 20 Jan 2013 |
| Externally published | Yes |
Keywords
- Ageing
- Fracture
- Mechanical property
- Microstructure
- Titanium alloy