Fatigue behavior of Ti-6Al-4V alloy in saline solution with the surface modified at a micro- and nanoscale by chemical treatment.
This work evaluated the influence of the surface modification using acid etching combined with alkaline treatment on the fatigue strength of Ti-6Al-4V ELI alloy. The topography developed by chemical surface treatments (CST) was examined by scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM). Increased roughness and effective surface area were investigated and compared with the Ti-6Al-4V samples without modification. Surface composition was analyzed by energy dispersive X-ray spectroscopy (EDS). Axial fatigue resistance of polished and modified surfaces was determined by stepwise load increase tests and staircase test method. Light microscopy and SEM were employed to examine the fracture surface of the tested specimens. According to the results, a similar fatigue behavior was found and a negligible difference in the fatigue crack nucleation was observed for the Ti-6Al-4V with CST in comparison to the samples without treatment.
Federal University of São Carlos, Department of Materials Engineering, Rod. Washington Luiz km. 235, 13565-905 São Carlos, SP, Brazil.
Cesar Adolfo Escobar
CAE
Claros
Federal University of São Carlos, Department of Materials Engineering, Rod. Washington Luiz km. 235, 13565-905 São Carlos, SP, Brazil.
Diego Pedreira
DP
Oliveira
Federal University of São Carlos, Department of Materials Engineering, Rod. Washington Luiz km. 235, 13565-905 São Carlos, SP, Brazil.
Leonardo Contri
LC
Campanelli
Federal University of São Carlos, Department of Materials Engineering, Rod. Washington Luiz km. 235, 13565-905 São Carlos, SP, Brazil.
Paulo Sergio Carvalho
PSC
Pereira da Silva
Federal University of São Carlos, Department of Materials Engineering, Rod. Washington Luiz km. 235, 13565-905 São Carlos, SP, Brazil.
Claudemiro
C
Bolfarini
D000497:Alloys; D012965:Sodium Chloride / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
D000497:Alloys; C031462:titanium alloy (TiAl6V4); D012965:Sodium Chloride; D014025:Titanium
Acid etching; Alkaline treatment; Fatigue; Ti6Al4V