Synthesis and Characterisation of New Superelastic and Low Elastic Modulus Ti-Nb-X Alloys for Biomedical Application

Abstract

Ti-Nb based alloys are well known to their good mechanical properties, shape memory effect, superelasticity, as well as good biocompatibility. The Ti-24Nb (at%) binary alloy presents a shape memory behavior and low elastic modulus. Our study is focused on the improvement of their mechanical properties by adding a third alloying element (oxygen, nitrogen or silicon). Addition of 0.5 at% of N or O modifies drastically the mechanical behavior of Ti-24Nb alloy that exhibits superelastic behavior instead of shape memory one. On the other hand, addition of 0.5 at% of Si increased yield strength of the Ti-24Nb shape memory alloy.

Effect of Ta Content on Microstructure and Phase Transformation Temperatures of Ti75.5-Nb25.5 (%at.) Alloy

“…Therefore, Ti-Nb alloy can be one of the best candidates instead of Ti-Ni alloy because of their non-toxic elements. Also, binary Ti-Nb alloy has good mechanical properties, shape memory effect, superelasticity, as well as good biocompatibility at room temperature [22]. Besides, mechanical properties of Ti-Nb alloy can be further improved by adding the third elements into it.…”

“…Besides, mechanical properties of Ti-Nb alloy can be further improved by adding the third elements into it. Ramarolahy et al added N, O, and Si to Ti-Nb and they found that after adding 0.5 at% of N, O, and Si, the TiNb-based SMA showed good superelastic properties and low Young's moduli that make them good candidates for biomedical applications [22]. Al-Zain, et al showed that by adding Mo the maximum recovery and transformation strains of a Ti-Nb alloy increased [23].…”