Effect of laser shock peening on the high-temperature fatigue performance of 7075 aluminum alloy

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 704; pp. 459 - 468
• Main Authors: Wang, J.T., Zhang, Y.K., Chen, J.F., Zhou, J.Y., Luo, K.Y., Tan, W.S., Sun, L.Y., Lu, Y.L.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 17.09.2017; Elsevier BV
• Subjects: Aluminum alloy; Aluminum alloys; Aluminum base alloys; Compressive properties; Dislocation density; Fatigue life; Fracture; Grain refinement; High temperature; High temperature fatigue; Laser shock peening; Laser shock processing; Materials fatigue; Microstructural observation; Microstructure; Peening; Precipitates; Residual stress; Scanning electron microscopy; Work hardening; Laser shock peening; Fracture; High temperature fatigue; Microstructural observation; Aluminum alloy
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2017.08.050

7075 aluminum alloy was subjected to intensive laser shock peening (LSP), and the effect of LSP on the microstructure and high-temperature fatigue properties of the alloy at various elevated temperatures was investigated. Microstructural characterization of the laser-shock-peened (LSPed) material was performed with scanning electron microscopy (SEM) and transmission electron microscopy. The LSPed sample exhibited an improved high-temperature fatigue performance. Its fatigue life increased by 110% at 150°C. Grain refinement, work hardening, and precipitates were detected through SEM. After LSP, significant changes in surface morphology in three stages of high-temperature fatigue were examined. Results suggested that the highly dense dislocation structure and high compressive residual stress induced by LSP significantly improved the high-temperature fatigue performance of the 7075 aluminum alloy.