Abstract
The microstructure and mechanical properties of a hot-rolled Ti-22Al-25Nb (at%) alloy sheet after aging and solution-aging treatment were studied. A typical core-shell structure formed in the as-received specimens upon aging at 650 °C to 950 °C for 6 h. O phases precipitated around the grain boundaries or in the B2 matrix for the solution-treated specimens upon aging at 650 °C to 950 °C. The combined effect of the precipitation and solution strengthening led to a decrease in microhardness while aging from 650 °C to 900 °C and an increase in microhardness while aging from 900 °C to 1000 °C for both the as-received and solution-treated specimens after the aging treatment. Finer O phases contributed to the increase in yield strength and elongation and were more beneficial to the improvement of high temperature strength than of room temperature strength.
| Original language | English |
|---|---|
| Pages (from-to) | 103-113 |
| Number of pages | 11 |
| Journal | Materials at High Temperatures |
| Volume | 38 |
| Issue number | 2 |
| DOIs | |
| State | Published - 2021 |
Keywords
- O phase
- TiAlNb
- mechanical properties
- phase transformation
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