Corrosion Fatigue Crack Growth of 7475 T7351 Aluminum Alloy under Flight Simulation Loading

Effect of saline corrosion environment on fatigue crack growth of 7475-T7351 aluminum alloy under TWIST flight loading

“…The corrosion products thus generated prevent the applied stress from loading the front of the crack, because first the oxide barrier must be broken so that the load can act upon the material itself. The changing of fatigue crack growth rate behavior when the tests are performed at saline atmosphere as showed in fatigue tests under TWIST flight has been observed on FALSTAFF (Fighter Aircraft Loading Standard for Fatigue) flight, because the combination of load and saline atmosphere effect, the number of cycles to fracture is larger when it is compared to cycles to fracture at room atmosphere [26]. Fig.…”

Corrosion Effects on High‐cycle Fatigue Lifetime and Fracture Behavior for Heat‐treated Aluminum‐matrix Nano‐clay‐composite Compared to Piston Aluminum Alloy

“…In following paragraphs, a literature review could be seen for fatigue properties of aluminum alloys [4][5][6][7][8][9][10][11][12][13] and aluminum-matrix composites [14][15][16][17]. In addition, some other articles [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] have been reviewed for corrosion-fatigue properties of aluminum alloys. Ueno et al [4] studied fatigue properties of Al-Si-Cu alloys in ambient air and vacuum environments.…”

“…They claimed that the pre-corrosion heat treatment led to a decrease in the number of cycles to failure, due to premature the crack initiation on corrosion defects. Chemin et al [24] investigated the corrosion-fatigue crack growth of the 7475-T7351 aluminum alloy in the air and the saline environment. Their results demonstrated that the fatigue crack propagation lifetime of samples in the saline was longer than ones in the air.…”

An in-situ method to estimate the tip temperature and phase selection of secondary Fe-rich intermetallics using synchrotron X-ray radiography

“…In cast Al-Cu alloys with higher Fe concentrations (>0.3 wt.%), more diverse Fe-rich IMCs were reported [12][13][14] depending on the solidification conditions. These faceted and relatively insoluble IMCs can degrade alloy ductility and toughness by acting as 30 stress raisers and crack initiators [14][15][16], and may also cause severe localised corrosion in high-end aerospace alloys [17][18][19][20]. Nonetheless, a complete understanding of the factors controlling IMC phase nucleation, growth and how they vary with composition, With real-time X-ray radiography and an in-situ temperature estimation approach, we show directly from the radiographs that different Fe-rich IMCs formed and grew at a range of tip undercoolings, depending upon cooling rate and grain refiner additions, which in turn affected phase selection and the final IMC population.…”