Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7208070 | Journal of the Mechanical Behavior of Biomedical Materials | 2016 | 6 Pages |
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}ã100ã 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׳.
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Authors
Y.P. Hou, S. Guo, X.L. Qiao, T. Tian, Q.K. Meng, X.N. Cheng, X.Q. Zhao,