Abstract
Microstructure evolution and hardening response behavior during duplex aging of TB8 titanium alloy were investigated by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), differential scanning calorimeter (DSC). Results show that ω precipitates appeared when the alloy is treated by pre-aging at 400℃ for 1 h, and these precipitates transform from ω to α phase in the subsequent final-aging process at 500℃. Hardness of the samples increases obviously in the process of final-aging treatment, and enhanced intensity of (101) α peak suggested amount of α phase increases synchronistically. Results of FE-SEM, DSC and XRD analysis find that pre-aging treatment generated lots of ω precipitates, which supplied the basis of precipitating of fine α phase, and the transformation completion nearly needed about 5.5 h final-aging treatment at 500℃.
| Original language | English |
|---|---|
| Pages (from-to) | 58-64 |
| Number of pages | 7 |
| Journal | Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment |
| Volume | 37 |
| Issue number | 2 |
| State | Published - 25 Feb 2016 |
Keywords
- Aging response
- Duplex aging
- Phase transformation
- β titanium alloy