engleski

Niobium and cobalt influence on the microstructure and hardness of Ti-Cr alloys

Due to their outstanding properties, such as low elastic modulus, high strength, corrosion resistance and excellent biocompatibility, pure titanium and its β -type alloys are currently widely used as structural biomaterials. Over the last three decades, the development of titanium alloys containing niobium for biomedical implant applications has continued to increase. Niobium as non-toxic element is an attractive β -stabilizer for titanium alloys. Chromium is also the β - phase improving element, while cobalt is a strengthener. This paper presents the comparison of niobium and cobalt influence on the microstructure and hardness of Ti-Cr-based alloys for biomedical use. For this purpose Ti-Cr-Nb and Ti-Cr-Co alloys are produced from pure elements by an arc melting method. As-cast specimens are metallographycally prepared for microstructural examinations by optical and scanning electron microscopy (SEM). Microphotographs were taken with digital camera and analyzed with the corresponding programs. Hardness tests were carried out by Vickers method. According to the obtained results, some alloys, designed in this study, have potential use as biomaterials.

biomaterials; as-cast Ti-Cr-Nb and Ti-Cr-Co alloys; microstructure; hardness

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