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| Material: | TA6V Titanium Alloy |
| Color: | Titanium Gold |
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The Ti-6Al-7Nb is an Aluminium - Niobium alpha-beta alloy. Its biocompatibility and mechanical properties are superior to those of the Ti-6Al-4V. This alpha-beta titanium alloy came up in 1977 by a team of researchers in Switzerland. Their aim was to create a titanium alloy that would meet the demands of the medical and surgical sectors.
Composition
| Chemical Composition Limits | |||||||||
| Weight % | Al | Nb | Ta | Fe | O | C | N | H | Ti |
| Titanium 6Al-7nb | 5.5-6.6 | 6.5-7.5 | 0.50 max | 0.25 max | 0.20 max | 0.08 max | 0.05 max | 0.009 max | Bal |
| Property | Minimum Value (S.I.) | Maximum Value (S.I.) | Units (S.I.) | Minimum Value (Imp.) | Maximum Value (Imp.) | Units (Imp.) |
| Atomic Volume (average) | 0.01 | 0.011 | m3/kmol | 610.237 | 671.261 | in3/kmol |
| Density | 4.51 | 4.53 | Mg/m3 | 281.55 | 282.799 | lb/ft3 |
| Energy Content | 750 | 1250 | MJ/kg | 81254 | 135423 | kcal/lb |
| Bulk Modulus | 111 | 142 | GPa | 16.0992 | 20.5953 | 106 psi |
| Compressive Strength | 1074 | 1086 | MPa | 155.771 | 157.511 | ksi |
| Ductility | 0.1 | 0.15 | 0.1 | 0.15 | NULL | |
| Elastic Limit | 895 | 905 | MPa | 129.809 | 131.259 | ksi |
| Endurance Limit | 559 | 564 | MPa | 81.076 | 81.8012 | ksi |
| Fracture Toughness | 68 | 75 | MPa.m1/2 | 61.8832 | 68.2535 | ksi.in1/2 |
| Hardness | 2700 | 2900 | MPa | 391.602 | 420.61 | ksi |
| Loss Coefficient | 0.001 | 0.002 | 0.001 | 0.002 | NULL | |
| Modulus of Rupture | 984.5 | 995.5 | MPa | 142.79 | 144.385 | ksi |
| Poisson's Ratio | 0.35 | 0.37 | 0.35 | 0.37 | NULL | |
| Shear Modulus | 36 | 41 | GPa | 5.22136 | 5.94655 | 106 psi |
| Tensile Strength | 995 | 1005 | MPa | 144.313 | 145.763 | ksi |
| Young's Modulus | 100 | 110 | GPa | 14.5038 | 15.9541 | 106 psi |
| Glass Temperature | K | °F | ||||
| Latent Heat of Fusion | 360 | 370 | kJ/kg | 154.771 | 159.071 | BTU/lb |
| Maximum Service Temperature | 600 | 650 | K | 620.33 | 710.33 | °F |
| Melting Point | 1800 | 1860 | K | 2780.33 | 2888.33 | °F |
| Minimum Service Temperature | 0 | K | -459.67 | °F | ||
| Specific Heat | 540 | 560 | J/kg.K | 0.417883 | 0.433361 | BTU/lb.F |
| Thermal Conductivity | 7 | 8 | W/m.K | 13.1042 | 14.9763 | BTU.ft/h.ft2.F |
| Thermal Expansion | 8 | 9.8 | 10-6/K | 14.4 | 17.64 | 10-6/°F |
| Breakdown Potential | MV/m | V/mil | ||||
| Dielectric Constant | NULL | |||||
| Resistivity | 126 | 158 | 10-8 ohm.m | 126 | 158 | 10-8 ohm.m |
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Resistance Factors
1=Poor 5=Excellent
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| Flammability | 5 |
| Fresh Water | 5 |
| Organic Solvents | 5 |
| Oxidation at 500C | 4 |
| Sea Water | 5 |
| Strong Acid | 4 |
| Strong Alkalis | 4 |
| UV | 5 |
| Wear | 3 |
| Weak Acid | 5 |
| Weak Alkalis | 5 |
Heat treatment of titanium is demonstrated to have significant influences on reducing the residual stresses, improving the mechanical properties (i.e. tensile strength or fatigue strength by solution treatment and ageing). Moreover, heat treatment provides an ideal combination of ductility, machinability and structural stability due to the differences in microstructure and cooling rates between α and β phases.[11]
The cooling rate have an impact of the morphology . When the cooling rate is reduced for example from air cool to slow cooling, the morphology of the transformed α increases in thickness and length and is contained within fewer, larger α colonies.[12] The α colony size is the most important microstructural properties due to its influences the fatigue properties and deformation mechanics of β processed α+ β alloys.
Ti6Al7Nb has a wide range of applications in the medical field, especially in the production of orthopedic implants and dental restorations.
Ti6Al7Nb alloy is a new type of medical titanium alloy, similar to the Ti-6Al-4V alloy widely used in clinical practice, and both belong to the α+β type titanium alloy. However, Ti6Al7Nb alloy replaces the toxic vanadium element (V) in Ti-6Al-4V alloy with the non-toxic element niobium (Nb), so it not only avoids the potential harm that the V element may bring, but also retains the high strength characteristics comparable to Ti-6Al-4V alloy. In addition, the Nb element also gives Ti6Al7Nb alloy the advantages of high hardness, corrosion resistance, good ductility, thermal stability and chemical stability.
In medical applications, Ti6Al7Nb alloy is mainly used to make orthopedic implants, such as artificial joints. Its excellent mechanical properties and corrosion resistance enable the implant to remain stable in the body for a long time, reduce patient discomfort and improve treatment effects. At the same time, because Ti6Al7Nb alloy has good biocompatibility and can interact harmoniously with living tissues without causing harmful reactions, it is particularly suitable for use inside the human body.
In addition to orthopedic implants, Ti6Al7Nb alloy has also received widespread attention in the field of dentistry. It can be used to make dental products such as crowns and dentures to meet patients' dual needs for beauty and function. In addition, with the development of additive manufacturing technologies such as 3D printing, Ti6Al7Nb alloy has also shown great potential in the manufacture of dental implants with complex geometries or composed of reticular structures.
In order to improve the performance of Ti6Al7Nb alloy in medical applications, researchers have also studied its surface modification technology. Through oxidation, electrophoretic deposition, ion implantation and other methods, the corrosion resistance, wear resistance and biocompatibility of Ti6Al7Nb alloy can be improved, further broadening its application range in the medical field.
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