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Microstructural and mechanical characteristics of biomedical Ti-Cr alloys with 5 and 10 at.% of cobalt

The development of new materials for medical implants attracts considerable academic and commercial interest. Titanium alloys are among the most widely used and promising biomaterials because they possess desirable characteristics for biomedical purpose. It appears that the most adequate properties have alloys with structure of beta titanium. In this work a six titanium-chromium based alloys with 5 and 10 at. % of cobalt have been investigated with goal to obtain a new titanium alloys of beta-type. Experimental Ti-Cr-Co alloys were prepared by melting pure elements in a laboratory arc furnace and metallographic treated for further analysis. Microstructural observations by scanning electron microscope (SEM) showed that alloys with 5 at. % of cobalt were single beta-phase, while in those with 10 at. % of cobalt intermetallic compound Ti2Co at grain boundaries and alfa-phase in the beta-grains were established. Chemical compositions of present phases were determined by means of energy-dispersive spectrometry (EDS). Quantitative metallographic analysis was performed by computer program Image Tool (UTHSCSA). Mechanical properties such as hardness and strength were characterized by Vickers method (HV2) and compressive test respectively. Hardness of alloys increases with increasing chromium content and ultimate compressive strengths have high values. From the results obtained in this investigation it can be concluded that some a new Ti-Cr-Co alloys have a potential for biomedical application.

as cast Ti-Cr-Co biomedical alloys; microstructure; mechanical properties

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