Origin of ultralow Young׳s modulus in a metastable β-type Ti-33Nb-4Sn alloy

Journal of the Mechanical Behavior of Biomedical Materials
Y P HouX Q Zhao

Abstract

Although there is difficulty in growing a Ti-33Nb-4Sn single crystal due to its ultralow β-phase stability, the single-crystal elastic constants of metastable β-type Ti-33Nb-4Sn (wt%) alloy were extracted successfully from its polycrystal by in-situ synchrotron X-ray diffraction technique, to clarify the origin of the ultralow Young's modulus in its polycrystal. It is indicated that compared to binary TiCr, TiV and TiNb alloys, the Ti-33Nb-4Sn alloy possesses slightly lower β-phase stability with respect to {110}<110>(-)shear (i.e., C׳) but much lower β-phase stability regarding to {001}〈100〉 shear (i.e., C44). An analysis by the Hill approximation suggests that the ultralow isotropic polycrystalline Young׳s modulus (EH) of Ti-33Nb-4Sn alloy originates from the extremely low shear modulus C44 as well as the relatively low C׳. This indicates that in addition to C׳, C44 has a significant contribution to the Young's modulus of polycrystal, which challenges a conventional understanding that the Young's modulus of β-type Ti alloys is predominantly determined by C׳.

References

Nov 11, 1999·Biomaterials·W F HoJ H Lin
Aug 7, 2007·Physical Review Letters·Y L HaoR Yang
Sep 12, 2012·Journal of the Mechanical Behavior of Biomedical Materials·S-H LeeT Nakano
Jul 11, 2014·Journal of the Mechanical Behavior of Biomedical Materials·S GuoX Q Zhao

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