Slitiny na bázi beta-Ti pro využití v medicíně

Preisler, Dalibor

1 Title: Beta-Ti alloys for medical applications Author: Dalibor Preisler Department / Institute: Department of Physics of Materials Supervisor of the doctoral thesis: doc. PhDr. RNDr. Josef Stráský, Ph.D., Department of Physics of Materials Abstract: Interstitial strengthening by a high amount of oxygen can be used in metastable beta-Ti alloys, for achieving very high strength without compromising ductility. The content of oxygen however influences the phase stability and consequently increases the Young's modulus. Several alloys with various content of beta-stabilizing elements were prepared by common metallurgical route. On top of that, dozens of compositions were prepared by a high-throughput powder metallurgy method and thoroughly studied. Lattice softening due to proximity to a martensitic transformation was utilized to minimize the Young's modulus. Effect of omega phase was thoroughly studied; it was found that the embrittlement by the athermal omega phase is most probably connected with the high oxygen content and its room-temperature diffusion into omega particles. Fundamental difference between elastic behaviour of alloys containing a significant fraction of omega and those with only a limited amount of omega was demonstrated. Regarding the plastic deformation mechanisms, it was found that...

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