Abstract
This study is focused on the influence of alloying elements such as Al, V, Nb, Fe, Mo, and Ta on the microstructure and properties of titanium based alloys. The TiAlV, TiAlNb, TiAlFe, TiMo, and TiTa alloys with various concentrations of alloying elements were prepared by arc melting. Molybdenum and niobium do not harden Ti alloys. In opposite to these two elements, Fe hardens Ti alloys, mostly, and creates particles of FeTi intermetallic phase. A slow cooling leads to a local redistribution of alloying elements and a rapid increase in local chemical inhomogeneity. Experiments of bio-behaviour have shown unsuitability of alloys with Fe for implants in medicine.

Key words
titanium alloys, heat treatment, microstructure, chemical composition, hardness, biocompatibility

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