Abstract
High Nb containing TiAl alloy was fabricated in argon atmosphere by reactive hot pressing process. Reaction mechanism was investigated by means of microstructural analyses and thermodynamic calculations. The results show that it is feasible to prepare high Nb containing TiAl alloy with fine lamellar colonies by reactive hot pressing process. The reaction between Ti and Al powders is dominant in Ti-Al-Nb system. Nb powders dissolve into the Ti-Al matrix by diffusion. Pore nests are formed in situ after Nb powders diffusion. The hot pressing atmosphere is optimized by thermodynamic calculations. Vacuum or argon protective atmosphere should be adopted.
| Original language | English |
|---|---|
| Pages (from-to) | 853-857 |
| Number of pages | 5 |
| Journal | Transactions of Nonferrous Metals Society of China (English Edition) |
| Volume | 16 |
| Issue number | 4 |
| DOIs | |
| State | Published - Aug 2006 |
| Externally published | Yes |
Keywords
- High Nb containing TiAl alloy
- Powder metallurgy
- Reaction mechanism
- Thermodynamics
- TiAl based alloy
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