Alpha Case in Titanium: Formation, Detection & Removal
Alpha case from oxygen diffusion during heat treatment.
Quick Answer
Alpha case is an oxygen-enriched brittle surface layer from heat treatment above 480°C in air.
Removal
| Method | Rate | Finish |
|---|---|---|
| Chemical milling | 0.001-0.003 in/min | 32-64 Ra |
| Machining | 0.002-0.010 in/pass | 16-32 Ra |
References
- AMS 2759, ASTM B265