Nano Seminar
Thursday, 10. 3. 2022, 14.00
Lecture room F2, MFF UK Ke Karlovu 5
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Josef Stráský
Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University
Achieving high strength and low elastic modulus in Ti-Nb-Zr alloys with interstitial oxygen
High strength and low elastic modulus are critical properties of biomedical titanium alloys for manufacturing of load-bearing orthopaedic implants. Single phase beta Ti alloys can achieve low elastic modulus, but their strength is usually not high enough. On the other hand, commonly used strengthening by alpha phase precipitation causes a sharp increase of elastic modulus. High strength can be achieved by controlled alloying with oxygen, which causes interstitial strengthening. Low modulus is achieved due to premartensitic softening by tailoring the content of beta stabilizing elements – the stability of beta matrix is reduced due to the proximity to the martensitic transformation. Compositionally optimized Ti-29Nb-7Zr-0.7O alloy, with yield stress exceeding 1000 MPa and modulus of elasticity of 65 GPa, appears promising for manufacturing of load bearing implants.
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