Tensile and high-cycle fatigue properties of spray formed Al10.8Zn2.9Mg1.9Cu alloys after two-stage aging treatment
(1. State Key Laboratory for Fabrication and Processing of Nonferrous Metals,
General Research Institute for Nonferrous Metals, Beijing 100088, China;
2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China)
General Research Institute for Nonferrous Metals, Beijing 100088, China;
2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China)
Abstract: Based on the investigation of the tensile properties of spray formed ultra-high strength Al10.8Zn2.9Mg1.9Cu alloys, the high-cycle fatigue properties under different theoretical stress concentration factors were investigated, the fatigue fracture surfaces and microstructures were observed, and the fatigue mechanism was discussed. The results indicate that the ultimate tensile strength of spray formed Al10.8Zn2.9Mg1.9Cu alloys can reach up to 730−740 MPa, and the elongation is about 8%−10% under the condition of two-stage aging treatment. For the stress ratio is 0.1, the maximum stress for 107 cycles is over 400 MPa and 120 MPa, when the theoretical stress concentration factor is 1 and 3, respectively.
Key words: Al10.8Zn2.9Mg1.9Cu alloy; spray forming; ultra-high strength aluminum alloy; high-cycle fatigue properties