Corrosion of a dissimilar friction stir weld joining aluminium alloys AA2024 and AA7010

Jariyaboon, Manthana; Davenport, Alison J.; Ambat, Rajan; Connolly, Brian J.; Williams, Stewart; Price, D. A.

doi:10.1179/174327806x107905

Cited by 22 publications

(27 citation statements)

References 55 publications

(72 reference statements)

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“…During the exposure, cathodic regions were observed mostly on AA2024 outside the nugget, but also inside the nugget and on the AA7050 base material. Thus, cathodic sites are not restricted to the AA2024, as reported for dissimilar butt welds [27]. It is worth noting that according to the SVET results (Fig.…”

Section: Scanning Vibrating Electrode Techniquesupporting

confidence: 61%

“…5f). According to the literature, for similar butt welds of the AA7050 alloy IC attack should be expected on the NZ close to the border with TMAZ [9,26], while for dissimilar butt welds between AA7010 and AA2024 alloys, IC was reported to occur on the Zn rich part of NZ, which consists of material arising from the AA7010 alloy [27]. It is important to observe that for the lap joint, studied here, the tool is introduced from the AA7050 alloy side during the FSW process and this alloy forms most of the nugget, while for dissimilar butt welds the nugget is formed by almost equal contributions of both alloys.…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

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Corrosion study of the friction stir lap joint of AA7050-T76511 on AA2024-T3 using the scanning vibrating electrode technique

2015

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Section: Scanning Vibrating Electrode Techniquesupporting

confidence: 61%

Section: Cyclic Voltammetrymentioning

confidence: 99%

Corrosion study of the friction stir lap joint of AA7050-T76511 on AA2024-T3 using the scanning vibrating electrode technique

2015

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“…the sensitisation of the microstructure, present on both sides of the recrystallised weld nugget, is caused by the temperature increase during friction stir welding . Consequently, the precipitate-free zone along the grain boundaries and the hardening precipitates are subjected to widening and coarsening (lumsden et al 1999;Jariyaboon et al 2006a;Hassan et al 2003b;Jata et al 2000;Rhodes et al 1997a). this causes an increased corrosion susceptibility.…”

Section: Corrosion Behaviour Of Friction Stir Welds In Aluminium Alloysmentioning

confidence: 99%

Metallurgy and weld performance in friction stir welding

Santos¹,

Olea²,

Coelho

et al. 2010

Friction Stir Welding

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“…The temperature developed during the friction stir welding (FSW) of high strength 7-xxx series aluminum alloys promotes a coarsening of precipitates and a widening of the precipitate-free zones, in particular within the heat affected zones of the weld [1,2]. These latter weld zones appear to be the most corrosion susceptible regions [3,4].…”

Section: Troductiomentioning

confidence: 99%

Environmental Cracking and Impact Investigations after Short-Term Temperature Treatments: 7050-T7451 Friction Stir Weld

Paglia

2010

MSF

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The influence of short-term heat treatments on the environmental cracking and impact properties of a 7050-T7451 friction stir weld were investigated. Prisms, cut transverse to the welding direction, were exposed for minutes at temperatures between 100 o C and 800 o C in an oven or exposed to a propane torch flame and/or water / air quenched. A significant increase in the environmental cracking resistance (ductility ratio from 0.2 to 0.9) was observed for samples exposed to temperatures below the solutionizing limit, but between 240 o C and 280 o C. The fracture location changed from the "soft" heat affected zones to the nugget. Furthermore, the weld exhibited a decrease in the Charpy impact adsorbed energy as compared to the weld unaffected parent metal. An increase in the temperature improved the adsorbed energy, while a temperature decrease promoted the brittleness and reduced the adsorbed energy. The flow contours, also called onion ring bands, present within the nugget, represented a preferential fracture path during impact. The high temperature treatments followed by water quenching did not significantly improved the resistance to impact. I TRODUCTIOThe temperature developed during the friction stir welding (FSW) of high strength 7-xxx series aluminum alloys promotes a coarsening of precipitates and a widening of the precipitate-free zones, in particular within the heat affected zones of the weld [1,2]. These latter weld zones appear to be the most corrosion susceptible regions [3,4]. Recently, the effect of natural, artificial and RRA aging on the properties and structure of 7-xxx series aluminum alloys [5,6], and on the mechanical and corrosion properties of 7249 and 7075 aluminum alloys [7,8] as well as the effect of temperature and exposure on precipitates morphology, strength and plasticity [9] were investigated. In this concern, conventional post-weld heat treatments have been used to partially restore the properties of the welds. These treatments often reached solutionizing temperatures and the samples were subsequently subjected to re-aging processes [10,11,12]. A non-conventional post-weld heat treatment was also applied to AA 7075-T651 [13], obtaining an increase in the corrosion properties. This was mainly due to the local dissolution of precipitates, in particular along the grain boundaries. Nevertheless, short-term heat treatments that might modify the properties of the welds are currently on an initial investigation stage.Like the corrosion, the resistance to impact is an important property of engineering components subjected to dynamic loading. The temperature also control the fracture behaviour. The fracture proceeds, for ferritic alloys, through microvoid coalescence (ductile behaviour), adsorbing energy, or through cleavage, for brittle behaviours. In this latter case, the energy adsorbed decreases with a reduced toughness of the material [14]. The influence of notch severity and temperature on the impact were also tested for AA 7055. The fracture toughness of 45 o notched samples ...

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Corrosion of a dissimilar friction stir weld joining aluminium alloys AA2024 and AA7010

Cited by 22 publications

References 55 publications

Corrosion study of the friction stir lap joint of AA7050-T76511 on AA2024-T3 using the scanning vibrating electrode technique

Corrosion study of the friction stir lap joint of AA7050-T76511 on AA2024-T3 using the scanning vibrating electrode technique

Metallurgy and weld performance in friction stir welding

Environmental Cracking and Impact Investigations after Short-Term Temperature Treatments: 7050-T7451 Friction Stir Weld

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