Ti6Al7Nb Titanium Bars

Ti6Al7Nb is a high-strength, corrosion-resistant alpha-beta titanium alloy. It was developed as a biomedically improved alternative to the more common Ti6Al4V alloy, specifically for surgical implant applications. The key difference is the replacement of the potentially controversial Vanadium (V) with the more biocompatible Niobium (Nb).

The "6Al7Nb" in the name indicates its nominal chemical composition: 6% Aluminum (Al);

7% Niobium (Nb); Balance Titanium (Ti).

Ti6Al7Nb titanium bars are prized for the following combination of properties:

• Excellent Biocompatibility: This is its primary advantage. Niobium is highly inert and non-toxic within the human body, making it perfectly suited for long-term surgical implants. It does not cause adverse reactions and is compatible with bodily tissues and fluids.
• High Specific Strength: It has an excellent strength-to-weight ratio, comparable to Ti6Al4V. It is as strong as many steels but about 45% lighter, which is crucial for reducing the weight of implants and aerospace components.
• Outstanding Corrosion Resistance: Like most titanium alloys, it forms a stable, adherent, and protective oxide layer (primarily TiO₂) on its surface. This layer makes it highly resistant to corrosion in a wide range of environments, including chloride-containing media (like body fluids and seawater).
• Good Fatigue Resistance: It can withstand repeated cycles of stress, which is essential for implants like hip stems and bone screws that are subject to constant loading.
• Low Modulus of Elasticity: Its modulus is closer to that of human bone than stainless steel or cobalt-chromium alloys. This "modulus matching" helps reduce stress shielding, a phenomenon where the implant bears too much load, causing the adjacent bone to weaken and resorb.
• Good Fabricability: Ti6Al7Nb bars can be machined, forged, and hot-formed, although they require techniques specific to titanium alloys to avoid work hardening and tool wear.

The properties of Ti6Al7Nb titanium bars make them ideal for demanding applications in medical and biomedical sectors.

Hip Joint Prostheses:

Femoral stems and heads.

Knee Joint Replacements.

Bone Screws, Plates, and Nails:

For trauma and spinal surgery.

Dental Implants.

Critical Surgical Instruments.

• ASTM F1295: Standard Specification for Wrought Ti-6Al-7Nb Alloy for Surgical Implant Applications.
• ISO 5832-11: Implants for surgery - Wrought titanium 6-aluminium 7-niobium alloy.

Ti6Al7Nb titanium bars is a near-β alloy engineered specifically for surgical implant applications. By replacing the potentially toxic vanadium in Ti-6Al-4V with niobium, it delivers high specific strength, a reduced elastic modulus, outstanding biocompatibility and superior corrosion resistance in body fluids. It is the only vanadium-free titanium bar alloy recognized in both ISO 5832-11 and ASTM F1295. Its role in the medical field is well-established and critical for modern orthopedic and dental surgery.