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

Abstract : 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.
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https://hal.archives-ouvertes.fr/hal-00919290
Contributor : Sandrine Geffroy <>
Submitted on : Monday, December 16, 2013 - 3:22:04 PM
Last modification on : Tuesday, January 12, 2021 - 4:43:35 PM

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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, Elsevier, 2013, 18, pp.47-56. ⟨10.1016/j.jmbbm.2012.10.018⟩. ⟨hal-00919290⟩

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