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Article Dans Une Revue Journal of the mechanical behavior of biomedical materials Année : 2013

Effects of thermomechanical process on the microstructure and mechanical properties of a fully martensitic titanium-based biomedical alloy

Résumé

Thermomechanical treatments have been proved to be an efficient way to improve superelastic properties of metastable β type titanium alloys through several studies. In this paper, this treatment routes, already performed on superelastic alloys, are applied to the Ti-24Nb alloy (at%) consisting of a pure martensite α′′ microstructure. By short-time annealing treatments performed on the heavily deformed material, an interesting combination of a large recoverable strain of about 2.5%, a low elastic modulus (35 GPa) and a high strength (900 MPa) was achieved. These properties are shown to be due to a complex microstructure consisting of the precipitation of nanoscale (α+ω) phases in ultra-fine β grains. This microstructure allows a superelastic behavior through stress-induced α′′ martensitic transformation. In this study, the microstructures were characterized by X-ray diffraction and transmission electron microscopy and the evolution of the elastic modulus and the strain recovery as a function of the applied strain was investigated through loading-unloading tensile tests.

Domaines

Matériaux

Dates et versions

hal-00919290 , version 1 (16-12-2013)

Identifiants

Citer

W. Elmay, F. Prima, Thierry Gloriant, B. Bolle, Y. Zhong, et al.. Effects of thermomechanical process on the microstructure and mechanical properties of a fully martensitic titanium-based biomedical alloy. Journal of the mechanical behavior of biomedical materials, 2013, 18, pp.47-56. ⟨10.1016/j.jmbbm.2012.10.018⟩. ⟨hal-00919290⟩
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