TiMoZrTaSi alloys appertain to a new generation of metallic biomaterials, labeled high-entropy alloys, that assure both biocompatibility as well as improved mechanical properties required by further medical applications. This paper presents the use of nondestructive evaluation techniques for new type of alloys, TiMo20Zr7Ta15Six, with x = 0; 0.5; 0.75; 1.0, which were obtained by vacuum melting. In Ti alloys, the addition of Mo improves tensile creep strength, Si improves both the creep and oxidation properties, Zr leads to an α crystalline structure, which increases the mechanical strength and assures a good electrochemical behavior, and Ta is a β stabilizer sustaining the formation of solid β-phases and contributes to tensile strength improvement and Young modulus decreasing. The effects of Si content on the mechanical properties of the studied alloys and the effect of the addition of Ta and Zr under the presence of Si on the evolution of crystallographic structure was studied. The influence of composition on fracture behavior and strength was evaluated using X-ray diffraction, resonant ultrasound spectroscopy (RUS) analyses, SEM with energy dispersive X-ray spectroscopy, and acoustic emission (AE) within compression tests. The β-type TiMo20Zr7Ta15Six alloys had a good compression strength of over 800 MPa, lower Young modulus (69.11-89.03 GPa) and shear modulus (24.70-31.87 GPa), all offering advantages for use in medical applications.

Department of Materials Engineering University of Zilina 010 26 Zilina Slovak Republic

Faculty of Materials Science and Engineering Technical University Gheorghe Asachi 700050 Iasi Romania

Frank Laboratory for Neutron Physics Joint Institute for Nuclear Research Dubna 141980 Russia

Institute of Thermomechanics Academy of Sciences of the Czech Republic 182 00 Prague Czech Republic

National Institute of Standards and Technology Gaithersburg MD 20899 USA

Nondestructive Testing Department National Institute for Research and Development for Technical Physics 700050 Iasi Romania

Normandie Université ENSICAEN UNICAEN CNRS CRISMAT 14000 Caen France

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