Stress corrosion cracking of a high-strength friction-stir-welded joint of an Al–Zn–Mg–Zr alloy containing 0.25 wt.% Sc

Deng, Ying; Peng, Bing; Xu, Guofu; Pan, Qing‐Jiang; Rui, Yong; Wang, Yingjun; Lu, Liying; Yin, Zhoulan

doi:10.1016/j.corsci.2015.06.031

Cited by 47 publications

(6 citation statements)

References 44 publications

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“…Simultaneously, with the concentration of hydrogen ion increasing, hydrogen generates and enters into the crack tips, and then decreases the bonding strength of metal atoms, and eventually accelerates the propagation of SCC . Hydrogen embrittlement is referenced many times as a cause of SCC, and its effect can be influenced by the size of grain boundary precipitates, as the larger grain boundary precipitates contain a larger number of irreversible trapping sites that trap hydrogen, reducing the amount of hydrogen in solution. This prediction is in agreement with observation made by Michler et al…”

Section: Discussionmentioning

confidence: 99%

Crack‐induced intergranular corrosion behavior of aerial aluminum alloy subjected to severe plastic deformation

et al. 2018

Materials & Corrosion

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The influence of crack‐induced on the intergranular corrosion (IGC) behavior of aerial aluminum alloy subjected to severe plastic deformation (SPD) is investigated in this work. Addressing this problem, a particular SPD technology, namely elliptical cross‐sectioned spiral equal channel extrusion (ECSEE), is employed to prefabricate cracks. The microstructure, induced‐crack observation and IGC behavior of the ECSEE‐ed alloy are observed. ECSEE can significantly refine the grains, while lots of small and deep dimples as well as broken second‐phase particles appear on fracture surface. The formation mechanism of the fracture surface is revealed based on the observation of fracture morphology. A typical stress corrosion cracking characteristic is observed in IGC tested ECSEE‐ed alloy, and the corroded fracture consisted of higher volume fraction of brittle intergranular fractures that are made up of rockcandy‐like brittle and intergranular fracture. The mechanism of intergranular corrosion of dehiscence and cracking is determined considering the factors such as grain refinement, grain boundary precipitations, preexisted crack, and residual stress.

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Section: Discussionmentioning

confidence: 99%

Crack‐induced intergranular corrosion behavior of aerial aluminum alloy subjected to severe plastic deformation

et al. 2018

Materials & Corrosion

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“…A high content of Sc (above 0.20 wt.%) in Al alloys can facilitate the formation of microscaled primary Al 3 Sc or Al 3 Sc 1−x Zr x particles, resulting in stress concentrations and deteriorating ductility [22][23][24]. Our previous work [18] further indicated that with the increase of Sc content, the elongation of Al-Zn-Mg alloys plates decreased.…”

Section: Instructionmentioning

confidence: 94%

Nanostructure Characteristics of Al3Sc1−xZrx Nanoparticles and Their Effects on Mechanical Property and SCC Behavior of Al–Zn–Mg Alloys

2020

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The Nanostructure characteristics of Al3Sc1−xZrx nanoparticles and their effects on the mechanical properties and stress corrosion cracking (SCC) behavior of Al–Zn–Mg alloys were investigated by 3D atom probe analyses, high-angle annular-dark-field scanning transmission electron microscopy methods, electron back scattered diffraction techniques, electrochemical measurements, slow strain rate tests and quantitative calculations. The results show that adding small amounts of scandium (0.10 percent by weight) and zirconium into Al–Zn–Mg extrusion bars can precipitate Al3Sc1−xZrx nanoparticles with a number density of (7.80 ± 3.83) × 1021 per cubic meter. Those particles, with a low lattice misfit with matrix (1.14 ± 0.03 percent) and stable core-shell L12-nanostructure in aged Al–Zn–Mg alloys, can increase the yield strength by 161 ± 7 MPa via strong Orowan strengthening (the theoretical calculated value is 159 MPa) and weak Hall-Petch strengthening (the theoretical calculated value is 6 MPa). Moreover, Al3Sc1−xZrx nanoparticles can change the fracture mechanism of alloys in 3.5% NaCl solution from intergranular cracks to transgranular failure, and decrease the proportion of high-angle grain boundaries from 87% to 31%, thus reducing the microchemistry differences around the grain boundaries and anodic dissolution kinetics, and improving intergranular SCC resistance and ductility. This study offers a new approach to the simultaneous improvement in mechanical property and corrosion performance of high strength alloys.

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“…Differences in the corrosion behavior of the RS and the AS have been reported in the literature for various Al-alloys [15][16][17]. When studying the 7020 Al-alloy welded by FSW, Dudzik observed that the RS was more susceptible to corrosion compared to the AS [15].…”

Section: Introductionmentioning

confidence: 92%

“…The high temperatures reached and the intense plastic deformation in the welding joint (WJ) lead to the formation of a thermo-mechanically affected zone (TMAZ) and a stir zone (SZ). Next, thermal effects also allow differentiation of the heat-affected zone (HAZ) from the unaffected parent metal (PM) [12][13][14] Moreover, due to the differences in the material flow and the heat transfer on both sides of the weldment, the two sides of the joint present different microstructural features [15][16][17][18]. Thus, in the retreating side (RS), the directions of transverse motion and tangential vector of the tool rotation speed are in opposite directions, whereas in the advancing side (AS), they are in the same direction [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

On the local corrosion behavior of coupled welded zones of the 2098-T351 Al-Cu-Li alloy produced by Friction Stir Welding (FSW): An amperometric and potentiometric microelectrochemical investigation

Silva

Izquierdo

Milagre

et al. 2021

Electrochimica Acta

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The galvanic coupling effects and the local electrochemical activity developed along the welded zones in FSWelded 2098-T351 Al-Cu-Li alloy have been investigated using localized electrochemical methods supported by surface analytical characterizations. The investigation was carried out in the coupled welding joint/heat affected zones (WJ/HAZ) for both the retreating (RS) and the advancing (AS) sides. The correlation between surface chemistry, microstructural features and electrochemical activity of these welded zones has been studied. The results showed the development of galvanic interactions within and between the WJ and the HAZ regions that were visualized using the Scanning vibrating electrode technique (SVET) and scanning electrochemical microscopy (SECM). SVET analyses showed that the HAZ was more susceptible to the development of anodic sites compared to WJ. SECM in amperometric operation mode showed that the WJ coupled to HAZ presented higher oxygen consumption and greater cathodic activity compared to HAZ. Furthermore, SECM in the potentiometric operation mode showed alkalization on the WJ and increased acidity on the HAZ, mainly at severe localized corrosion (SLC) sites. Based on SVET and SECM results in combination surface analysis, it is proposed that the micro-galvanic cells formed within these welded zones are due to the presence of secondary phases in the 2098-T351 alloy and their interactions with the adjacent matrix.

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Stress corrosion cracking of a high-strength friction-stir-welded joint of an Al–Zn–Mg–Zr alloy containing 0.25 wt.% Sc

Cited by 47 publications

References 44 publications

Crack‐induced intergranular corrosion behavior of aerial aluminum alloy subjected to severe plastic deformation

Crack‐induced intergranular corrosion behavior of aerial aluminum alloy subjected to severe plastic deformation

Nanostructure Characteristics of Al3Sc1−xZrx Nanoparticles and Their Effects on Mechanical Property and SCC Behavior of Al–Zn–Mg Alloys

On the local corrosion behavior of coupled welded zones of the 2098-T351 Al-Cu-Li alloy produced by Friction Stir Welding (FSW): An amperometric and potentiometric microelectrochemical investigation

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