Materials6 min read
Ti6Al4V is the most widely used titanium alloy in additive manufacturing. It combines high specific strength with excellent corrosion resistance, and it is expensive and slow to machine from solid — which is precisely why building it near-net shape is attractive.
Typical characteristics
- High strength-to-weight ratio; density around 60% of steel.
- Excellent corrosion resistance in aggressive and marine environments.
- Retains useful properties at moderately elevated temperature.
- Biocompatible grades available for medical applications.
- Low thermal conductivity, which influences both printing and machining.
Where it earns its cost
- Aerospace brackets and structural fittings where mass is money.
- Motorsport and defence hardware.
- Medical instruments and device components.
- Chemically aggressive service where stainless steel is marginal.
Design and finishing considerations
Titanium is sensitive to residual stress, so orientation and support strategy matter. Vacuum stress relief is normal, and hot isostatic pressing may be specified where fatigue performance is critical. Machining allowance should be designed into critical features from the start, because titanium is unforgiving to fixture and cut on thin, complex printed geometry.