Improvement in fatigue strength while keeping low Young's modulus of a β-type titanium alloy through yttrium oxide dispersion

Enhancing Functionalities of Metallic Materials by Controlling Phase Stability for Use in Orthopedic Implants

“…However, the mechanical reliability of these β-type Ti alloys with low Young's modulus is typically lesser than that of a common (α + β)-type Ti-6Al-4V ELI alloy. Therefore, improvement in the mechanical reliability of β-type Ti alloys with low Young's modulus is currently under study [20,21]. The static strength, namely, the tensile strength and 0.2 % proof strength of β-type Ti alloys with maintaining low Young's modulus can be achieved to the level of those of Ti-6Al-4V ELI alloy by severe cold working such as severe cold rolling, swaging and forging, and severe plastic deformation such as high pressure torsion (HPT) [5,22,23].…”

“…For example, as a result of introducing a small amount of the ω phase by the sort-time aging, the fatigue strength of Ti-29Nb-13Ta-4.6Zr alloy, which is one of the β-type Ti alloys with low Young's modulus for biomedical applications, increases to a level of that of Ti-6Al-4V ELI alloy while maintaining its Young's modulus around 75 GPa [20]. Furthermore, introducing a small amount of ceramics such as TiB and Y 2 O 3 to the β-phase matrix is also effective to improve the fatigue strength of β-type Ti alloys [21,25]. [21] Ti-6Al-4V ELI alloy and Ti-29Nb-13Ta-4.6Zr alloy was investigated [26,27].…”

“…Furthermore, introducing a small amount of ceramics such as TiB and Y 2 O 3 to the β-phase matrix is also effective to improve the fatigue strength of β-type Ti alloys [21,25]. [21] Ti-6Al-4V ELI alloy and Ti-29Nb-13Ta-4.6Zr alloy was investigated [26,27]. Volume loss of Ti-29Nb-13Ta-4.6Zr alloy was larger than that of Ti-6Al-4V ELI alloy for both discs and balls (mating materials) in the ball-on-disc type wear testing as shown in Fig.…”

β-Grain Refinement of α+β-Type Ti–4.5Al–6Nb–2Fe–2Mo Alloy by Using Rare-Earth-Oxide Precipitates

“…Moreover, it has been reported that the addition of 0.1 mass%Y to the ¢-type Ti alloy (Ti29Nb13Ta4.6Zr) improves the fatigue strength and maintains a low Young's modulus. 16) La 2 O 3 and TiB precipitation by the addition of LaB 6 in a near ¡-alloy, IMI834 (Ti5.8Al4.0Sn3.5Zr 0.7Nb0.5Mo0.35Si), resulted in fine grain microstructures and superior mechanical properties. 17,18) The addition of rareearth elements such as Er, 19,20) lanthanum (La), cerium (Ce) and neodymium (Nd) 21) to commercially pure (CP) Ti has also been reported.…”

Effect of Oxide Particles Formed through Addition of Rare-Earth Metal on Mechanical Properties of Biomedical β-Type Titanium Alloy

“…15,16) The small amounts of oxide particles added to TNTZ improved the fatigue property without causing an increase in Young's modulus. However, an increase in the amount of oxide particles led to particle aggregation, which seemed to result in a decrease in the mechanical strength of TNTZ.…”