Year-end Sale % OFF 
Abstract
A series of Ti-25Nb-8Zr-xCr (x = 0, 2, 4, 6, 8 wt%) alloys were designed based on DV-Xα cluster method and e/a¯-Δr¯ diagram with an anticipation to obtain high plasticity and significant strain hardening. The designed alloys were produced through cold crucible levitation melting technique in order to effectively investigate their microstructures and mechanical properties. The addition of Cr significantly enhances the β stability in the microstructures of the Ti-25Nb-8Zr-xCr alloys. Both yield strength and hardness of the studied alloys increase due to the effect of solid-solution strengthening. By constrast, the plasticity, maximum strength and strain hardening rate are influenced by the β stability as well as the distinct deformation mechanisms. None of the alloys comprising Cr fail up to 100 kN (the load capacity used) and all show impressive plasticity (~75%) and superior maximum compressive strength (~4.5 GPa) at 100 kN. Moreover, the deformation bands, which are found around the hardness indentations, are analyzed for all the investigated alloys. The fracture behaviors of the Ti-25Nb-8Zr-xCr alloys are also studied to observe the characteristics related to crack propagation, plastic deformation and the formation of shear bands.
Highlights
Metastable β Ti alloys persistently show an effective balance between strength and ductility through the variation of different deformation mechanisms, such as mechanical twinning, stress-induced martensite (SIM) and dislocation slip as a function of β phase stability [17,18]
The results of nominal and measured chemical compositions are almost identical, with the minimal amount of oxygen content found for all the TNZx alloys
The present work investigates the microstructural characteristics, the mechanical properties, the elasto-plastic deformation and deformation behaviors for the newly-designed Ti-25Nb-8Zr-xCr (x = 0, 2, 4, 6, 8 wt%) alloys, which were designed based on DV-Xα cluster method and e=a-Δr diagram
Summary
The so-called “stress shielding” phenomenon is prominent in these conventional biomaterials where the stiffness of these biomaterials is higher than that of the surrounding bone tissue [9,10,11]. This has necessitated the development of improved biomedical implant materials [12]. Metastable β Ti alloys persistently show an effective balance between strength and ductility through the variation of different deformation mechanisms, such as mechanical twinning, stress-induced martensite (SIM) and dislocation slip as a function of β phase stability [17,18]. The selection of alloying elements and their quantities are certainly important in the development of enhanced Ti alloys
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
