Mahmoud Hajisafari - Department of Metallurgy and Materials Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran
Arman Zare Bidaki - Department of Metallurgy and Materials Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran
Saeid Yazdani - Department of Metallurgy and Materials Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran

Nowadays modification of metallic biomaterials which are used as implants for bone and hard tissues replacement is considered as an important subject. In the current study, corrosion fatigue properties of Ti-۶Al-۴V alloy investigated via Rotating-Bending standard test method and then, the results compared with the fatigue properties of the specimens tested in the same conditions. Scanning electron microscopy used to investigate the chemical composition (EDS- Energy-dispersive X-ray spectroscopy), microstructural features and crack propagation characteristics. Results showed that the presence of corrosive environment not only results in decrease in fatigue life, but also eliminates the fatigue limit. Further studies revealed that aggregation of corrosion products, with more hardness values, at the crack tip cause an obvious deviation of crack propagation from its main direction. Therefore, a tortuous crack path through the bulk of the specimens was detected concurrent with penetration of solution into the crack. In addition, dimensions and morphology of fatigue crack surfaces were completely different from corrosion fatigue cracks as well.

Ti-۶Al-۴V alloy, Corrosion fatigue, Microstructure, Fracture surface, Striation features