Affiliation:
1. Hunan University of Science and Technology Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment Taoyuan road 411201 Xiangtan P. R. China
2. Lushan College of Guangxi University of Science and Technology Xinliu Avenue 99 545006 Liuzhou P. R. China
Abstract
AbstractIn this paper, the hardness, ultimate tensile strength, yield strength, elongation E100, S−N curves, and fatigue performance of 7075 aluminum alloy were obtained after aged at 170 °C for different times (10 h, 15 h, and 20 h). Additionally, the microstructure and fatigue fracture of the alloy were observed. The investigation results show that as the forming time increased, the hardness, ultimate tensile strength, and yield strength decreased, the elongation first decreased, then increased, and the fatigue limit increased. As the forming time increased, the metastable phase gradually transformed into a steady phase and coarsened, the width of precipitate free zone increased, and the width of the fatigue strip decreased. After creep age forming for 20 h, the precipitate free zone was the widest, approximately 100 nm.
Funder
National Natural Science Foundation of China
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science