Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5455603 | Materials Science and Engineering: A | 2017 | 10 Pages |
Abstract
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.
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Authors
J.T. Wang, Y.K. Zhang, J.F. Chen, J.Y. Zhou, K.Y. Luo, W.S. Tan, L.Y. Sun, Y.L. Lu,