Abstract
It is essential to develop biomedical implant materials with low Young’s modulus for alleviating stress shielding arising from the
gap of Young’s modulus between metal materials and bone tissue. Metastable β-type titanium alloys offer promising characteristics,
including good biocompatibility, specific strength, corrosion resistance, and low Young’s modulus. Among these alloys, Ti-Nb alloy
system exhibits low Young’s modulus when e/a is in the range of 4.26 ～ 4.30, that was reported in previous studies using single
crystal. The purpose of this study was to clarify whether Young’s modulus decreases in Ti-42Nb （wt.%） alloy, where e/a = 4.27,
developed even by laser-powder bed fusion （L-PBF） by comparing the Young’s modulus of Ti-42Nb alloy and Ti-15Mo-5Zr-3Al
（wt.%） alloy. This study revealed that Ti-42Nb alloy has lower Young’s modulus than Ti-15Mo-5Zr-3Al alloy when fabricated by
L-PBF, demonstrating the validity of Ti-42Nb alloy as a material for biomedical implant with low Young’s modulus.
