Preparation and Mechanical Properties of Porous Ti-5Nb Alloy with the Elongated Pores

Porous Ti-5 Nb alloys were prepared by powder metallurgy method using titanium and niobium powders as raw materials and spherical stearic acid as space holder,and the effects of stearic acid content on the microstructure and mechanical properties of porous Ti-5 Nb alloy were investigated by using the weighing method,XRD,SEM and universal mechanical testing machine.The results showed that porous Ti-5 Nb alloys with well-aligned and elongated pore structure were successfully prepared using spherical stearic acid as space holder.When stearic acid content increased from 10% to 50%,the phase composition of porous Ti-5 Nb alloy hardly changed,but its density decreased,the porosity increased,the connectivity between macropores increased,and elastic modulus and compressive strength decreased.The mechanical properties of porous Ti-5 Nb alloy can be matched with that of cortical bone and cancellous bone by controlling the amount of stearic acid.