engleski

Microstructural characterization of Ti-based alloys

In a few last decades development of biomedical titanium alloys without undesirable elements, aluminium and vanadium, has continued to increase. This paper shows microstructural characterization of two groups of titanium-based alloys. First, titanium was alloyed with chromium and molybdenum. In second type, niobium and zirconium were added to titanium. Purpose of this investigation was to examine the microstructure and hardness of Ti-Cr-Mo and Ti-Nb-Zr alloys with potential for biomedical use. Chemical compositions of investigated alloys were selected from the same corner of ternary titanium rich diagram and according to the similar biomedical Ti-based alloys. Three samples with different composition of each alloy type were laboratory prepared by an arc melting method. Their microstructure was examined by scanning electron microscope with energy-dispersive spectrometer (EDS) by point and line analysis. Hardness was determined by Vickers method. Results show that Ti-Cr-Mo alloys have two-phases microstructure containing beta and alfa or alfa” phase, while Ti-Nb-Zr alloys were nearly beta single-phase with traces of alfa-phase. EDS analysis indicates that alfa and beta have similar chemical composition which is in a good agreement to alloy composition. Vickers hardness of Ti-Cr-Mo alloys increases with molybdenum content, while those for Ti-Nb-Zr alloys increases with niobium content. According to the closely single-phase microstructure and lower hardness, Ti-Nb-Zr alloys have adventage as potential biomedical materials.

Ti-based alloys; biomedical material; microstructure; Vickers hardness

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