Influence of Nb Addition on Phase Constitution and Mechanical Properties of Biomedical Ti-Zr Based Alloys

Abstract

The influence of Nb addition on phase constitution, microstructure and mechanical properties of biomedical equi-atomic Ti-Zr based alloys was investigated. Phase constitution of Ti-Zr based alloys containing Nb rapidly cooled from ¢ single phase changed with Nb addition as follows:Young's moduli of Ti-Zr based alloys subjected to water quenching initially decreased with increasing Nb content. The minimal value was obtained in the Ti-48Zr-4Nb (mol%) composition alloy. The Young's moduli increased in relation to the phase constitution change. In the alloys containing over 4% Nb, their principal phase was changed by subsequent cold rolling, this is mainly because ¢ ¼ ¡A and ¢ ¼ ¡AA stress-induced martensitic transformation occurred. This phase transformation resulted in a decrease of Young's modulus. Furthermore, cold rolling impartd anisotropy to the Young's modulus which caused the value to drop. The Ti-47Zr-6Nb alloy had the lowest value of Young's modulus after cold rolling in this study, 59.5 GPa.

Pulsed Electrodeposition of HAP/CPG-BSA/CUR Nanocomposite on Titanium Metal for Potential Bone Regeneration

“…The hydroxyapatite (HAP) prepared by our previously reported method. 31 Briefly, 20 mL of 0.5 mM CaCl 2 .2H 2 O aqueous solution was slowly added into 20 mL of 0.3 mM of (NH 4 ) 2 HPO 4 aqueous solution the above mixture stirred vigorously on a magnetic stirrer. The pH of the reaction mixture upheld at pH 10.0 by using ammonia hydroxide.…”

Comprehensive review on alloy design, processing, and performance ofβTitanium alloys as biomedical materials

“…Interestingly, there is little consensus in literature on the relative modulus of α″ and β phases. The modulus of α″ is reported to be higher [94], lower [93], or similar [91] to the β phase. The modulus is also reported to decrease with cold rolling in β Ti alloys where no strain-induced α″ is produced.…”

“…Several other papers have attributed the reduction in modulus after cold rolling to crystallographic textures, although the textures have not been characterised in detail [85,91]. The reduction in modulus after cold rolling has also been attributed to the lower modulus of martensite [92,93]. Interestingly, there is little consensus in literature on the relative modulus of α ′′ and β phases.…”