Abstract
In this work, a two-step isothermal treatment (TIT) during the solidification process is proposed to eliminate micro-segregation and reduce the cracking tendency of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (at.%) alloy. The TIT consists of a short-term isothermal treatment in the single β phase region (1st IT) and a second isothermal treatment slightly above the β + α transus temperature (2nd IT). The results show that solidification without the isothermal treatment (NIT) produces non-uniform microstructures due to Al-segregation, whereas microstructure homogeneity is improved after the 1st IT due to the elimination of the peritectic α phase. The TIT can yield fine and uniform lamellar structures without micro-segregation, as well as reduced textures. Moreover, it is also found that the TIT can reduce the cracking tendency of TiAl alloys with high contents of Nb.
| Original language | English |
|---|---|
| Pages (from-to) | 121-131 |
| Number of pages | 11 |
| Journal | Acta Materialia |
| Volume | 112 |
| DOIs | |
| State | Published - 15 Jun 2016 |
Keywords
- Electron backscattering diffraction
- Homogeneity
- Intermetallics
- Microsegregation
- Solidification microstructure
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