STRÁSKÝ Josef

Spoluautoři JANEČEK Miloš, HARCUBA Petr, LANDA Michal

Low strength of biomedical beta titanium alloys in solution treated condition restricts their application. Commercial Ti-Nb-Zr-Ta biomedical alloy was used for this study. Small additions of iron, sillicon and oxygen were used to increase the strength of the alloy. The highest effect was achieved by oxygen content. The strength can be more than doubled after adding 0.7 wt.% of oxygen thanks to interstitial hardening. At the same time, the elastic modulus is increased from 60 GPa to 80 GPa that is associated with the interstitial positions of oxygen atoms that strengthen the otherwise soft bonding between transition metals atoms. Sharp yield point is observed in alloys containing 2 wt.% of iron and/or 0.7 wt.% of oxygen. These alloys also show significant work hardening that efficiently increases room temperature elongation. Scanning electron microscopy was employed for microstructural characterization.

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