Abstract
Ti-Al alloys are established as promising candidates for aerospace applications due to their lightweight, good elevated temperature strength, and decent corrosion resistance. In this study, a Ti-51Al (at.%) alloy is fabricated by spray deposition. The effects of temperature and strain rate on the deformation behavior of the spray-deposited Ti-Al alloy are investigated. The microstructural evolution of the Ti-Al alloy with different deformation temperatures is discussed in detail. A strain-dependent constitutive equation was proposed to predict the flow stresses at the elevated temperatures for the spray-deposited Ti-Al alloy. The microstructure of the as-deposited Ti-51Al alloy exhibits a α2/γ lamellar-structure with average size 25 ± 2 μm, due to the high cooling rate observed during solidification. The lamellar structure is embedded on a γ matrix. The amount of the α2/γ lamellar-structure reduces gradually with increasing the hot deformation temperature. After hot isostatic pressing at 1523 K, the microstructure is mainly comprised of the γ matrix.
| Original language | English |
|---|---|
| Pages (from-to) | 2844-2852 |
| Number of pages | 9 |
| Journal | Journal of Materials Research |
| Volume | 33 |
| Issue number | 18 |
| DOIs | |
| State | Published - 28 Sep 2018 |
| Externally published | Yes |
Keywords
- hot deformation
- microstructure
- rapid solidification
- spray deposition
- γ-TiAl alloy
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