Abstract
The fatigue crack growth behaviour of a Ti-48Al-2Cr-2Nb alloy prepared by two different processing routes, namely casting and powder metallurgy (PM), is examined. The lamellar microstructure of the cast alloy exhibits a higher resistance than the fine equiaxed γ grain microstructure of the PM alloy when tested at R = 0.1. Crack closure effects are lower in the PM alloy than in the cast alloy, due to smoother fracture surfaces. However, after crack closure correction, this alloy still presents the lower resistance, including in the near-threshold regime.
| Original language | English |
|---|---|
| Pages (from-to) | 825-830 |
| Number of pages | 6 |
| Journal | Scripta Materialia |
| Volume | 49 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 1 Nov 2003 |
| Externally published | Yes |
Keywords
- Casting
- Fatigue crack propagation
- Microstructure
- Powder consolidation
- Titanium aluminides
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