Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 704, Issue -, Pages 459-468Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.08.050
Keywords
Aluminum alloy; Laser shock peening; Microstructural observation; High temperature fatigue; Fracture
Categories
Funding
- National Natural Science Foundation of China [51275221, 51575242]
- Natural Science Foundation of Jiangsu Province [BK20151341, BK20151171]
- Natural Science Foundation of the Jiangsu Higher Education Institutions [12KJB460002]
- Applied Science Foundation of Changzhou City [CJ20159051]
- Changzhou High-tech Key Laboratory [CM20153001]
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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 degrees 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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