Effect of laser shock peening on the corrosion properties of Ti-6Al-3Nb-2Zr-1Mo alloy.

The surface treatment of Ti80 alloy with different microstructures was performed by laser shock peening (LSP), and the effect of LSP on Ti80 alloy on microstructure and corrosion properties was investigated. After LSP, the surface grains of Ti80 alloy with different microstructures were all refined, microhardness was significantly increased, and compressive residual stress was generated, and both microhardness and compressive residual stress showed gradient change characteristics along the layer depth. The corrosion resistance of Ti80 alloy with different microstructures was improved in both 3.5% NaCl solution and 5MHCL solution after LSP. Before LSP, the corrosion resistance of lamellar microstructure was the best, followed by bimodal microstructure and the worst by equiaxial microstructure, while the corrosion resistance of equiaxial microstructure exceeded that of bimodal microstructure under the combined effect of volume fraction of β phase, thickness of α phase and compressive residual stress after LSP. • A large number of dislocation tangles and deformation twins were formed in LSPed Ti80 alloy. • LSP can effectively improve the corrosion resistance of Ti80 alloys. • Corrosion resistance of untreated Ti80 alloy: lamellar > bimodal > equiaxial • After LSP, corrosion resistance of Ti80 alloy: lamellar > equiaxial > bimodal [ABSTRACT FROM AUTHOR]