Mechanical and corrosion resistance properties of AA7075-T6 sub-zero formed sheets

Bertolini, Rachele; Simonetto, Enrico; Pezzato, Luca; Fabrizi, Alberto; Ghiotti, Andrea; Bruschi, Stefania

doi:10.1007/s00170-021-07333-7

Cited by 22 publications

(11 citation statements)

References 47 publications

(57 reference statements)

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“…The corrosion resistance of a FSWed joint in aluminum alloys 6082-T6/7075-T6 improves significantly compared to the BM. A more negative Ecorr and a higher Icorr density indicate a greater tendency for corrosion [43]. In this case, a notably higher negative Ecorr value of 1455.9 mV and a higher Icorr density of 174.3 μAcm -2 were observed at 40 mm/min and 2300 rpm, indicating lower corrosion resistance.…”

Section: Corrosion Behaviormentioning

confidence: 78%

Effect of Welding Settings on Mechanical Characteristics, Microstructural Features, and Corrosion Performance in Friction Stir Welding of Dissimilar Aa6082-T6/7075-T6 Joints

Afify,

Gamil

2024

Journal of Al-Azhar University Engineering Sector

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This research explores the influence of welding settings (tool rotational speed, travel speed) on mechanical characteristics (tensile, micro-hardness), microstructure, and corrosion performance of dissimilar butt joints between aluminum alloys AA7075-T6 and AA6082-T6, which were fabricated by friction stir welding (FSW). The study considers three varied tool rotational speeds (1600, 2000, and 2300 rpm) in conjunction with three varied tool travel speeds (30, 40, and 50 mm/min). The butt joints were created by welding plates that were 6 mm thick. The welded specimens underwent characterization through optical microscopy, SEM, tensile testing, micro-hardness testing, and corrosion testing. Macroscopic observations of the samples revealed a range of stir zone shapes and defects that resulted from both inadequate and excessive heat input during the welding process. Analysis of the microstructure and results from the tensile testing indicated that the specimens produced using FSW settings of 2000 rpm and 40 mm/min achieved a peak ultimate tensile strength, demonstrating a value of 150 MPa. The micro-hardness values exhibited variations corresponding to changes in rotational speed, attaining a peak value of 240 HV at a rotational speed of 2300 rpm and a travel speed of 40 mm/min. The best mixing of the joined materials was achieved at a maximum welding rotational speed (2300 rpm) and medium travel speed (40 mm/min). A corrosion analysis of welded joints was conducted using a potentiodynamic polarization test in a solution containing 3.5% sodium chloride (NaCl). The welded zone (WZ) exhibits a reduced corrosion current density (Icorr), attributed to the occurrence of galvanic corrosion. The performance of corrosion within the WZ is impacted by the rotational speed and tool travel speed. Lowering the speed of the rotation tool leads to a decrease in the corrosion rate. Optimal corrosion resistance is achieved in the joint created at 2300 rpm and 30 mm/min, attributable to the suitable density and size of precipitates.

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Section: Corrosion Behaviormentioning

confidence: 78%

Effect of Welding Settings on Mechanical Characteristics, Microstructural Features, and Corrosion Performance in Friction Stir Welding of Dissimilar Aa6082-T6/7075-T6 Joints

Afify,

Gamil

2024

Journal of Al-Azhar University Engineering Sector

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“…The corrosion behavior of the material was generally dependent on the surface quality, grain size, and residual stresses because corrosion is a surface phenomenon. 41 According to Bertolini et al, 42 higher surface roughness led to a reduction in corrosion resistance due to the increment in the contact part between the corrosive medium and the surface. Additionally, Esteves et al 43 depicted that grain refinement and higher hardness were responsible for superior corrosion resistance.…”

Section: Resultsmentioning

confidence: 99%

Surface integrity analysis of aluminum 3003 alloy during ultrasonic-vibration-laser assisted turning

Deswal

Kant

2023

Proceedings of the Institution of Mechanical Engineers, Part B:

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Surface integrity of the machined surface is an important aspect considering their surface alterations, metallurgical effects, and mechanical characteristics during the machining process. Industries have been seeking a capable machining technology that can improve the machining process capabilities especially in an eco-friendly manner. Hybrid machining processes have shown significant improvement in machining performance when compared with the conventional turning (CT) process without using any cutting fluids. Moreover, a recently developed hybrid machining technology, that is, ultrasonic-vibration-laser assisted turning (UVLAT) has shown better machinability than the CT process. Therefore, an attempt has been made to improve the surface integrity of aluminum 3003 alloy in terms of machining forces, surface roughness, surface damage, microstructure, microhardness, residual stresses, and corrosion behavior during the UVLAT process. A comparative surface integrity analysis has been performed among the CT, ultrasonic vibration assisted turning (UVAT), laser assisted turning (LAT), and UVLAT processes. Significant improvement in the surface integrity has been observed for the aluminum 3003 alloy during the UVLAT process in comparison to the CT, UVAT, and LAT processes. The periodic separation of the cutting tool and thermal softening of the workpiece material, simultaneously during the UVLAT process is the possible reason for the improvement in surface integrity. Results demonstrated that the UVLAT process has an excellent potential to enhance the surface integrity of aluminum alloys and is better than the CT, UVAT, and LAT processes.

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“…The phenomenon of a gradually decreasing corrosion rate indicates the passivation of the material due to the formation of a permanent protective layer, i.e., Al2O3, which plays a crucial role in the process of improving corrosion resistance [22][23][24][25][26]. The corrosion data revealed that the icorr value decreased for 3 wt.% and 9 wt.% TiC relative to the starting material.…”

Section: Microstructural Observations Of Worn Samplesmentioning

confidence: 99%

Investigation on corrosion and wear properties of Al-7075/TiC composites fabricated by stir casting route

Velishala¹,

Pandiripalli

Chilamban

2022

Metall Mater Eng

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Metal matrix composites (MMCs) play a crucial role in the aerospace, automotive and mineral processing industries. The properties of aluminum matrix composites (AMC) that are renowned for their high strength, good stiffness and excellent thermal conductivity can be enhanced by incorporating various reinforcements. In this investigation, Al7075 alloy with TiC (3, 6, and 9 wt.%) reinforcements was processed via stir casting. Optical microscope (OM) and scanning electron microscope (SEM) were utilized to study the microstructural changes. The chemical composition and phases were analyzed using energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) respectively. Evaluations were conducted on properties such as hardness, tensile strength, corrosion and wear behavior. On increasing the wt.% of TiC from 3 to 9 wt.%, it was observed that the hardness increased by 11%, the tensile strength increased by 200%, and the wear rate decreased by 50%. The composite containing 9 wt.% TiC had the lowest corrosion resistance.

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Mechanical and corrosion resistance properties of AA7075-T6 sub-zero formed sheets

Cited by 22 publications

References 47 publications

Effect of Welding Settings on Mechanical Characteristics, Microstructural Features, and Corrosion Performance in Friction Stir Welding of Dissimilar Aa6082-T6/7075-T6 Joints

Effect of Welding Settings on Mechanical Characteristics, Microstructural Features, and Corrosion Performance in Friction Stir Welding of Dissimilar Aa6082-T6/7075-T6 Joints

Surface integrity analysis of aluminum 3003 alloy during ultrasonic-vibration-laser assisted turning

Investigation on corrosion and wear properties of Al-7075/TiC composites fabricated by stir casting route

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