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Luyten_47571700_2022.pdf
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- Titanium alloys are more and more used today, but they often lack ductility, toughness, or strain hardening capability. This hinders for instance their capacity to resist crack propagation. To counter that weakness, a new type of beta metastable titanium alloy with great ductility properties has been elaborated using the “d-electron design” method. A so-called alloy, the Ti-12 wt.% Mo has thus been created and shows impressive resistance to plastic deformation and damage nucleation, as well as a great strain hardening capability. Those surprising properties are due to the simultaneous activation of the TRIP (Transformation Induced Plasticity) and TWIP (Twinning Induced Plasticity) effects. In this thesis, the behavior of this alloy was analyzed during cyclic stresses. The Ti-12 wt.% Mo was compared to the famous Ti-6Al-4V titanium alloy (also know as TA6V) which represents more than 50% of the titanium industry today. This second alloy has a greater yield strength but isn’t as ductile and tough as the beta metastable alloy. Flexion and traction tests were carried out on those alloys in order to gather data for the realization of fatigue curves (Wöhler, Paris, …). SEM microscopies were also taken to understand the various mechanisms of the crack propagation.