An investigation of the mechanical behaviour of fine tubes fabricated from a Ti-25Nb-3Mo-3Zr-2Sn alloy

作者：Zhang Yaowu^*; Kent Damon; Wang Gui; St John David; Dargusch Matthew

来源：Materials and Design, 2015, 85: 256-265.

DOI：10.1016/j.matdes.2015.06.127

• Metastable beta-titanium alloy
• Fine tube
• Mechanical properties
• Twinning
• Martensitic transformation

This study investigates the mechanical properties and the deformation mechanisms active in Ti-25Nb-3Mo-3Zr-25n One tubes. Ti-25Nb-3Mo-3Zr-2Sn alloy is a recently developed metastable 13 titanium alloy intended for biomedical applications. Tensile tests were carried out on the One tubes. The modulus of the Ti-25Nb3Mo-3Zr-2Sn One tubes increased with reductions in the diameter for tubes in the cold rolled and annealed conditions. In comparison with cold rolled tubes, the annealed tubes exhibit increased strain hardening behaviour and superior ductility. Mechanical twins, stress-induced martensitic transformation and the textures of the beta and alpha '' phases were investigated. The results show that the One tubes exhibit different moduli which are related to the evolution of 13 and or phase textures during processing. Cold rolling facilitates the transformation from beta, to the alpha '' phase and mechanical {3321(113) twinning. For the annealed tubes, mechanical twinning as well as primacy and secondary martensitic transformations was activated at specific levels of tensile strain, Twins developed with increasing levels of strain, and secondary martensitic transformations occurred within the twinned') regions. Annealed One tubes exhibit multistage strain hardening behaviour and superior ductility clue to the synergetic effects of twinning induced plasticity and transformation induced plasticity during tensile deformation.

• 出版日期2015-11-15