To meet the increasing requirements for load-bearing implants, especially for the fracture healing of systemically diseased bone tissue, further developments in metallic materials research are required. Efforts are focused on the adjustment of the mechanical properties of the implant materials to those of human bone, as well as on tailoring functional surfaces to induce accelerated bone healing and improved anchoring. This work addresses the effect of thermomechanical processing on the microstructure and the mechanical properties of the two b-type Ti-Nb alloys, (Ti-36Nb)-3.5In and (Ti-40Nb)-3.5In. Rods with a diameter of 12 mm and a length of about 100 mm were produced by arc-melting and cold crucible casting. Solution treatment was carried out at 1273 K for 24 h to dissolve micro-segregations. Subsequent, the rods were deformed to plates with a final thickness of 1 mm by various hot and cold rolling steps. Annealing treatment at 850°C led to a complete recrystallized microstructure with a refined grain size for both alloys. The microstructure and texture evolution during the thermomechanical processing are analyzed in detail. Based on this, the tensile test behavior and related deformation mechanisms of the recrystallized samples are described and discussed.
This work is funded by the DFG as part of SFB/Transregio 79, project M1.