Ti-based alloys show low elastic modulus, high biocompatibility, and high corrosion resistance compared to Fe-based and Co-based alloys. Also, high/medium entropy Ti-Zr-Nb-base alloys would have lower elastic modulus besides the expected high corrosion resistance, therefore, become candidate for biomedical applications.
In this study, four Ti-Zr rich Ti-Zr-Nb-Mn-Fe medium/high entropy alloys are designed using THERMOCALC software to achieve single/multi metastable bcc-phases. In addition, the alloys would have low liquids temperature, in the range 1200-1250oC, to enhance alloys' castability and widen the room of biomedical application including easy-cast and additive manufactured implants.
Upon THERMOCALC calculations, Mn and Fe additions were found to reduce the liquids temperature and stabilize the bcc phases. However, the content of Mn and Fe should be controlled to avoid intermetallic formation.
The alloys are produced by arc remelting followed by full characterization of the alloys including; SEM, EDX, XRD, EBSD, corrosion, hardness, tensile and compression testing.