Wang Zhongguang

Research on the fatigue behavior of titanium based biomaterial coated with titanium nitride film by ion beam enhanced deposition

Abstract In the present study, three-point bending fatigue tests in Ringer solution were performed using unnotched specimens of Ti6A14V coated with TiN film by ion beam enhanced deposition (IBED). For comparison, uncoated samples were also investigated. The applied stresses on the tension side of the samples were 850–1100 MPa. The frequency was 60 Hz. The number of cycles to fatigue failure under different loads ranged from 3 × 10 4 to 1 × 10 7 . The coated and uncoated samples had different fatigue behaviors. The fracture mechanisms of the samples were also studied using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Energy dispersive X-ray spectrometry (EDX) revealed segregation of aluminum from the matrix to the TiN surface area during the fatigue process. It was concluded that a TiN film coated by IBED could improve the fatigue properties of Ti6A14V under low stress.