Effects of service environment and pre-deformation on the fatigue behaviour of 2524 aluminium alloy

• Published in: Archives of Civil and Mechanical Engineering 2020-03, Vol.20 (1), p.5, Article 5
• Main Authors: Chen, Y. Q., Zhang, H., Pan, S. P., Song, Y. F., Liu, X., Liu, W. H.
• Format: Article
• Language: English
• Subjects: Alloys; Aluminum base alloys; Aqueous environments; Argon; Aviation; Civil Engineering; Corrosion; Crack propagation; Deformation; Deformation effects; Electron microscopy; Engineering; Exfoliation corrosion; Fatigue cracks; Fatigue failure; Fatigue tests; Fog; Mechanical Engineering; Metal fatigue; Original Article; Predeformation; Propagation; Stress intensity factors; Structural Materials; Temperature; Transmission electron microscopy
• ISSN: 1644-9665; 2083-3318; 1644-9665
• DOI: 10.1007/s43452-019-0002-z

The effects of service environment and pre-deformation on the fatigue behaviour of 2524 alloy were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and fatigue tests. The results indicate that the fatigue crack-growth rate (FCGR) of the alloy in an aqueous environment increases with temperature ranging from 0 to 90 °C. At the same stress intensity factor range (Δ K ), the FCGR of the alloy in an argon environment is the smallest, followed by that in air, and a 3.5% NaCl fog environment, while that in an exfoliation corrosion (EXCO) solution is the largest. A pre-deformation of 2% can significantly enhance the fatigue crack propagation resistance of this alloy in argon, air, and 3.5% NaCl fog environments, while 5% pre-deformation weakens the fatigue crack propagation resistance of the alloy accordingly. The pre-deformation effect on the FCGR of alloy in the EXCO solution environment is limited.