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

Chemin, Aline Emanuelle Albuquerque; Saconi, Felipe; Filho, Waldek Wladimir Bose; Spinelli, Dirceu; Ruchert, Cassius Olívio Figueiredo Terra

doi:10.1016/j.engfracmech.2015.05.038

Cited by 18 publications

(8 citation statements)

References 27 publications

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“…Fatigue crack closure mechanisms have been shown to influence the FCGR behavior in various materials . Plasticity‐induced oxide‐induced, and fracture surface roughness‐induced crack closure mechanisms have been mainly used to explain the observed FCGR behavior. However, the crack closure mechanisms are expected to influence the growth rates at low stress ratios only.…”

Section: Resultsmentioning

confidence: 99%

Improved fatigue crack growth resistance by retrogression and re‐aging heat treatment in 7010 aluminum alloy

Nandana

Bhat

Manjunatha

2018

Fatigue Fract Eng Mat Struct

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Aircraft grade 7010 aluminum alloy was heat treated to two different conditions: (1) standard peak aging (T6) and (2) retrogression and re‐aging (RRA). The microstructures of these alloys were characterized by using transmission electron microscope. Fatigue crack growth rate (FCGR) tests were conducted using standard compact tension specimens, following ASTM standards. Tests were conducted at various stress ratios, R ranging from 0.1 to 0.7. The RRA‐treated alloy was observed to contain coarsened η′ (MgZn2) precipitates with higher inter‐particle spacing when compared with T6‐treated alloy. The grain boundary precipitates (GBPs) were also coarsened and discontinuous in RRA‐treated alloy as compared with continuous GBPs in T6 condition. The FCGR was lower and ΔKth was higher in RRA‐treated alloy compared with T6‐treated alloy at all the stress ratios investigated. Improved fatigue crack growth resistance in RRA‐treated alloy was correlated to the modified microstructure and enhanced crack closure levels.

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Section: Resultsmentioning

confidence: 99%

Improved fatigue crack growth resistance by retrogression and re‐aging heat treatment in 7010 aluminum alloy

Nandana

Bhat

Manjunatha

2018

Fatigue Fract Eng Mat Struct

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“…On another note, the precorrosion fatigue properties of aluminum alloys have been widely studied and established by various researchers over the past few years [ 25 , 26 , 27 , 28 , 29 , 30 ]. However, there are only a few studies, which investigated the precorrosion fatigue behavior of FSW EN AW-5754 aluminum alloy specimens.…”

Section: Introductionmentioning

confidence: 99%

Effect of Corrosion and Surface Finishing on Fatigue Behavior of Friction Stir Welded EN AW-5754 Aluminum Alloy Using Various Tool Configurations

et al. 2020

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In this study, fatigue behavior of surface finished and precorroded friction stir welded (FSW) specimens using various tool configurations were comparatively investigated by the load increase method. The FSW using conventional, stationary shoulder and dual-rotational configurations was carried out by a robotized tool setup on 2 mm EN AW-5754 aluminum sheets in butt joint formation. After extraction of the specimens, their weld seam and root surfaces were milled to two different depths of 200 µm and 400 µm to remove the surface and the FSW tool shoulder effects. This surface finishing process was performed to investigate the effect of the surface defects on the fatigue behavior of the FSW EN AW-5754 aluminum alloy sheets. It was found that material removal from the weld and root surfaces of the specimens, increased the fracture stresses of conventional and dual-rotational FSW from 204 to 229 MPa and 196 to 226 MPa, respectively. However, this increase could not be detected in stationary shoulder FSW. Specimens with finished surfaces, which showed superior properties, were used in salt spray and cyclic climate change test to investigate the effect of corrosion on the fatigue behavior of FSW specimens. It was shown that cyclic climate change test reduced the fatigue properties of the base material, conventional, stationary shoulder and dual-rotational FSW approximately 1%–7%. This decrease in the fatigue properties was greater in the case of the salt spray test, which was 7% to 21%.

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“…Compared with those in air, the FCGR of Al alloy exhibits significant degradation in vacuum or inert gas environments especially in the early stage of crack propagation, 11 which is believed to be due to promotion of the reverse-slip process caused by isolating the oxygen from Al alloy. In addition, many studies indicated that 12 the FCGR of Al alloy generally increases in saline solution due to the pitting caused by the corrosion reaction between the inclusions and chloride ions. Besides, Michailidis et al 13 recently compared the corrosion-fatigue behaviour of an AA7075-T651 alloy in 3.5 wt% NaCl solution and distilled water.…”

Section: Introductionmentioning

confidence: 99%

The fatigue crack growth behaviour of 2524‐T3 aluminium alloy in an Al₂O₃ particle environment

Chen

Tang

Pan

et al. 2020

Fatigue Fract Eng Mat Struct

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The effect of the Al2O3 dust environment on the crack propagation behaviour of 2524‐T3 Al alloy was investigated. The results show that the Al2O3 dust environment reduces the fatigue crack growth rate (FCGR) of alloy especially at low ΔK. Many Al2O3 particles are deposited and stuck in the crack during fatigue loading which promotes crack closure, while this effect is gradually weakened with the increase of ΔK. The deposited Al2O3 particles induce the disorderly arranged slip bands (SBs) ahead of the crack tip which deflects the crack path making it more tortuous in the Al2O3 dust.

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

Cited by 18 publications

References 27 publications

Improved fatigue crack growth resistance by retrogression and re‐aging heat treatment in 7010 aluminum alloy

Improved fatigue crack growth resistance by retrogression and re‐aging heat treatment in 7010 aluminum alloy

Effect of Corrosion and Surface Finishing on Fatigue Behavior of Friction Stir Welded EN AW-5754 Aluminum Alloy Using Various Tool Configurations

The fatigue crack growth behaviour of 2524‐T3 aluminium alloy in an Al₂O₃ particle environment

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

Cited by 18 publications

References 27 publications

Improved fatigue crack growth resistance by retrogression and re‐aging heat treatment in 7010 aluminum alloy

Improved fatigue crack growth resistance by retrogression and re‐aging heat treatment in 7010 aluminum alloy

Effect of Corrosion and Surface Finishing on Fatigue Behavior of Friction Stir Welded EN AW-5754 Aluminum Alloy Using Various Tool Configurations

The fatigue crack growth behaviour of 2524‐T3 aluminium alloy in an Al2O3 particle environment

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The fatigue crack growth behaviour of 2524‐T3 aluminium alloy in an Al₂O₃ particle environment