Effect of microstructure on corrosion behavior of a Zr-Sn-Nb-Fe-Cu-O alloy
School of Engineering
This work investigates the effect of microstructure on tensile properties and corrosion behavior of a Zr-Sn-Nb-Fe-Cu-O alloy. Scanning electron microscope, transmission electron microscope, electron back scattering diffraction, tensile tests and autoclave corrosion test were jointly carried out to characterize in detail the microstructural features and properties of the alloy studied. The corrosion rate constant increases with decreasing the degree of recrystallization. The sample with slower evolution of undulated interface exhibits higher tensile strength and possesses better corrosion resistance. The plasticity of sample can hardly be the rigorous limitation on corrosion performance, which is attributed to the consistent consummation of the deformed substrate around the interface during corrosion to make the inner undeformed substrate become fresh interface. Furthermore, second phase particles (SPPs) may play a role in the nucleation of cracks in the oxide. © 2015 Elsevier Ltd.