engleski

Microstructure and hardness of Ti-Cr-Co biomedical alloys after compressive test

The use of titanium alloys as biomaterials has been growing due to their good mechanical properties, excellent corrosion resistance and biocompatibility. Even though mechanical tests have not reached the level of clinical simulation, they represent an important parameter of analyses. So, in this work microstructure and mechanical properties after compressive test of four Ti-Cr-Co alloys (Ti75Cr20Co5, Ti70Cr25Co5, Ti75Cr15Co10, Ti70Cr20Co10) were examined. All alloys were metallographically prepared and etched for microstructural examinations. Their microstructure was analyzed by means of light microscope equipped with software for quantitative analysis and by scanning electron microscope with energy-dispersive sprectrometer as well. Hardness of experimental alloys was tested by Vickers method. Results of this investigation show that alloys containing 5 at.% of cobalt have β single-phase microstructure, while alloys with 10 at.% of this element have three-phases microstructure which consists of β-, α-phase and intermetallic compound Ti2Co. Compressive test caused decrease in average area of grains in single-phase alloys and increase in heterogeneous alloys respectively. Also, compressive test revealed that single-phase alloys were brittle and heterogeneous alloys were ductile. Hardness values of heterogeneous alloys are higher than those for homogenous alloys due to the presence of intermetallic compound in their microstructure. According to their microstructure and hardness after compressive test, alloys Ti75Cr20Co5 and Ti70Cr25Co5 may have the potential for biomedical application.

Ti-Cr-Co alloys ; microstructure ; hardness ; compressive test ; biomedical alloys

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