Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10646571 | Materials Science and Engineering: A | 2018 | 19 Pages |
Abstract
In order to optimize the fatigue strength of 7075 Al alloy, the hardness, tensile and fatigue tests as well as the microstructure observation under different aging conditions were investigated. The result indicates that, with the aging time increasing, the precipitation spacing first decreases and then increases, which leads to the hardness and tensile strength first increasing and then decreasing. With the increase of yield strength, the fatigue strength increases first and then decreases, resulting in an optimization of fatigue strength. Especially, the specimen aged at 120â¯Â°C for 48â¯h with strength and elongation in middle of the three specimens exhibits the highest fatigue strength of 165â¯MPa. Considering the effect of yield strength on fatigue strength and fatigue damage, the causes for the parabolic variation of fatigue strength were analyzed.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
L. Leng, Z.J. Zhang, Q.Q. Duan, P. Zhang, Z.F. Zhang,