|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Ultrafine-grained Materials X
||Nanostructured SPD-processed Ti-Nb-based Alloys for Load-bearing Implant Applications
||Mariana Calin, Stefan Pilz, Annett Gebert, Michael Zehetbauer, Jürgen Eckert
|On-Site Speaker (Planned)
The microstructure evolution, beta-phase stability and mechanical properties have been investigated for a series of beta-type Ti-Nb-based alloys (Ti-Nb and Ti-Nb-Ta-Zr/In/Cr). These alloys were produced by cold crucible casting and further processed by severe plastic deformation - SPD (high pressure torsion, accumulative roll bonding). Microstructural evolution was studied upon compressive loading and SPD for selected beta-Ti alloys with different phase stability against martensitic transformation. Transmission electron microscopy analyzes revealed that with increasing the deformation degree, martensitic transformation and deformation twinning are initially operative followed by slip of dislocations for the less stabilized beta Ti-alloys, whereas slip is initially operative followed by nanoscale deformation twinning for the relatively stabilized alloys. The nanostructuring occurred via SPD processing significantly contributes to the increase of hardness and strength of beta-type alloys but it has a little effect on elastic modulus since the bindings between atoms stay the same, even if defects are present.
||Planned: Supplemental Proceedings volume