Effects of Sn Content and Aging Conditions on Superelasticity in Biomedical Ti–Mo–Sn Alloys

Abstract

The effects of Sn content and aging conditions on superelasticity in Ti-Mo-Sn alloys were investigated. Martensitic transformation temperature decreased with an increasing of Sn content. A large superelastic strain of 3.0% was obtained in a solution-treated Ti-5 mol%Mo-5 mol%Sn alloy in the tensile test. The superelasticity in the Ti-5 mol%Mo-5 mol%Sn at room temperature was improved by aging at 873 K for short periods between 180 and 420 s. A specimen aged at 873 K for 300 s exhibited superelasticity with a recovery strain of 3.5% in the tensile test. A recovery strain of 3.0% was consistently achieved in cyclic tensile deformations.

Improvements in the Superelasticity and Change in Deformation Mode of β-Type TiNb24Zr2 Alloys Caused by Aging Treatments

“…This transformation was extensively investigated in the past. [1,[3][4][5][6][7][8][9][10][11] Furthermore, after the tensile tests, {332} b <113> b mechanical twinning can be clearly observed in specimens solutionized and aged for 1.8 and 3.6 ks, respectively, by means of TEM, as shown in Figures 3(a) and (b). It is difficult to distinguish whether this twinning formed during the loading process or after removing the stress.…”

“…[1] Recently, Ni-free Ti alloys such as Ti-Mo-based alloys [3][4][5][6][7] and Ti-Nb-based alloys [8][9][10][11] were extensively studied, because Ni ions released from metal implants cause allergic reactions. [2] In some metastable b-Ti alloys, x-phase particles precipitate during quenching (athermal x-phase particles) or after holding at a temperature of 523 K to 773 K (250°C to 500°C) (isothermal x-phase particles).…”

Effect of Annealing Temperature on Microstructure and Superelastic Properties of Ti-Au-Cr-Zr Alloy

“…Ti-Nb, 5) TiNb Al, 6) Ti-Nb-Zr, 7) TiNbTaZr 8) and Ti-Nb-Mo 9) ), Ti-Mo base alloys (e.g. Ti-Mo-Al, 10) Ti-Mo-Sn 11) and Ti-Mo-SnZr 12) ) and Ti-Ta base alloys (e.g. Ti-Ta 13) and Ti-Ta-Sn 14) ).…”

Optimum rolling ratio for obtaining {001}<110 > recrystallization texture in Ti–Nb–Al biomedical shape memory alloy

“…effect and superelasticity appear in various β-titanium alloys owing to the β (bcc) to α′′ (C-orthorhombic [3]) thermoelastic martensitic transformation [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The lattice deformation strain that determines the crystallographic maximum of the recovery strain in α′′-martensite is generally smaller than that of Ti-Ni (10.5%) and is not sufficient for practical use, even if the lattice parameters are optimized to increase the lattice deformation strain.…”