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Ti-6Al-7Nb rod

Application of Ti-6Al-7Nb

Ti-6Al-7Nb alloy is a medical alloy that successfully developed by Sulzer Medical Technology of Switzerland. The corresponding approximate grade is IMI367(UK). The corresponding US standard is as of ASTM F1267 UNSR56700.
Multiple alloy implants developed by Ti-6Al-7Nb Sheet and Ti-6Al-7V Rod have been put into clinical application with good results.
Ti-6Al-7Nb Titanium alloy is mainly used in various human surgical implants, such as artificial joints, bone correction and fasteners.

Ti-6Al-7Nb sheet

Compared with Ti-6Al-4V alloy, Ti-6Al-7Nb alloy replaces V with the non-toxic stable beta element Nb, which has the same atomic concentration as V. In terms of performance, Ti-6Al-4V alloy is equivalent to the recognized Ti-6Al-4V alloy, and is a safe and promising material for human implantation.

Processing technology of Ti-6Al-7Nb

1. Smelting process: select first-class sponge Titanium, pure Aluminum, and Aluminum Niobium or Ti-Nb intermediate alloy as raw materials, mix according to nominal composition → press electrode → melt in secondary or tertiary vacuum consumable furnace to obtain qualified ingots with uniform composition, focusing on solving the uniformity of Niobium.
2. Heat treatment process: Ti-6Al-7Nb Titanium alloy is a rod alloy that is heat treated in an electric furnace. A simple annealing process is adopted to conduct heat treatment at 700℃/h with air cooling.
3.Deformation process and properties: Ti-6Al-7Nb belongs to α+β Titanium alloy, and its thermal processing process is similar to Ti-6Al-4V, and the heating temperature of general ingot is 1150 °C-1200 °C.
Through hot forging, precision forging and hot rolling, the alloy is made into rods with diameters of 110mm, 60mm, 30mm, 20mm and 12mm Ti-6Al-7Nb Rod, which can meet the tensile properties and other properties specified in the technical standards (ASTM F1295) at room temperature.
Also it can be made into Ti-6Al-7Nb Sheet for medical inplant use.

After annealing, the high temperature tensile curve of Ti-6Al-7Nb alloy bar is shown in the figure below. With the increase of annealing temperature, the strength value is decreased and the plasticity is slightly increased.

High temperature tensile curve of Ti-6Al-7Nb titanium alloy
High temperature tensile curve of Ti-6Al-7Nb Titanium alloy

The performance of Ti-6Al-7Nb

Fatigue properties of Ti-6Al-7Nb (UNS R56700) alloy
Alloy Heat treatment Stress/Mpa Kt N/week
Ti-6Al-7Nb  Annealing 620 1.0 107
Protasul-100 620 1.0 107
Modulus of elasticity E=115GPa
Tensile properties of Ti-6Al-7Nb (UNS R56700) at room temperature as specified in the technical standard
Specifications σb/MPa σp0.2/MPa δ5/% ψ/%
Rod ≥900 ≥800 ≥10 ≥25
Effect of annealing temperature on tensile properties of Ti-6Al-7Nb (UNS R56700) 18mm rolling rod (3t ingot)
Annealing temperature σb/MPa σp0.2/MPa δ5/% ψ/%
600℃/h, air cooling 1030 943 17 45
700℃/h, air cooling 1020 923 16 46
750℃/h, air cooling 1015 895 16 44
800℃/h, air cooling 980 875 18 46
850℃/h, air cooling 940 840 18 47