Electrochemical corrosion behaviour of stir zone of friction stir welded dissimilar joints of AA6061 aluminium–AZ31B magnesium alloys

Jayaraj, R. Kamal; Malarvizhi, S.; Balasubramanian, V.

doi:10.1016/s1003-6326(17)60244-9

Cited by 40 publications

(14 citation statements)

References 19 publications

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“…Regarding aluminum/magnesium joints the optimal joint properties were achieved with the aluminum placed on the advancing side and magnesium on the retreating side [5][6][7]. Furthermore, offsets of the pin into the magnesium varied from 0 mm to 1 mm [5,8].…”

Section: State Of the Art And Aim Of The Investigationsmentioning

confidence: 99%

Application of the hybrid process ultrasound enhanced friction stir welding on dissimilar aluminum/dual‐phase steel and aluminum/magnesium joints

Thomä

Gester

Wagner

et al. 2019

Materialwissenschaft Werkst

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Friction stir welding as a solid-state joining method with its comparatively low process temperatures is suitable for joining dissimilar materials like aluminum/magnesium or aluminum/steel. Such hybrid joints are of great interest regarding lightweight efforts in different industrial fields like the transportation area. The present work investigates the influence of additionally transmitted power ultrasound during the friction stir welding on the joint properties of EN AC-48000/AZ91 and EN AW-6061/DP600. Therefore, conventional friction stir welding was continuously compared to ultrasound enhanced friction stir welding. Light microscopic analysis and nondestructive testing of the joints using x-ray and high frequency ultrasound show different morphologies of the nugget for the aluminum/magnesium joints as well as differences in the amount and size of steel particles in the nugget of aluminum/steel joints. Scanning electron microcopy proves differences in the thickness of continuous intermetallic layers for the aluminum/steel joints realized with and without power ultrasound. Regarding the tensile strength of the joints the power ultrasound leads to increased joint strengths for EN AC-48000/AZ91 joints compared to a decrease for EN AW-6061/DP600 joints. Corrosion investigations show an influence of the ultrasound power on the corrosion properties of EN AC-48000/AZ91 joints which is attributed to a changed aluminum content in the nugget region. Because of the great potential difference between the magnesium and the nugget phase the transitional area exhibits strong galvanic corrosion. For EN AW-6061/DP600 joints an increased corrosion caused by galvanic effects is not expected as the potentials of the EN AW-6061 aluminum alloy and DP600 steel are very similar.

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Section: State Of the Art And Aim Of The Investigationsmentioning

confidence: 99%

Application of the hybrid process ultrasound enhanced friction stir welding on dissimilar aluminum/dual‐phase steel and aluminum/magnesium joints

Thomä

Gester

Wagner

et al. 2019

Materialwissenschaft Werkst

View full text Add to dashboard Cite

show abstract

“…Another major factor that influences the high corrosion of the magnesium alloy samples compared to those of the aluminum alloys is the presence of impurities and Mg 17 Al 12 intermetallic compounds. The secondary phase can induce local galvanic corrosion or cause weak parts in the oxide film; while the major alloying elements, such as copper (Cu), nickel (Ni) and iron (Fe) are detrimental to the corrosion resistance of magnesium (Mg) alloys [47]. Corrosion pits occur at defects adjacent to a fraction of Mg 17 Al 12 , due to the breakdown of passivity [48].…”

Section: Resultsmentioning

confidence: 99%

Electrochemical performance in seawater and microstructural evolution of friction stir welded joints of dissimilar AA1050 and AZ91D

Kayode

Akinlabi

2021

Materialwissenschaft Werkst

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This paper presents the electrochemical performance and microstructural evolution of friction stir welded joint of dissimilar AA1050 and AZ91D in seawater, for potential applications in the transportation industry. The corrosion behavior of the dissimilar weld was compared to the corrosion behavior of the parent materials, and similar welds of each alloy. The experiments were successfully conducted with an H13 hot‐working tool steel in butt‐joint configuration. The results revealed the presence of intercalated microstructure in the dissimilar weld and homogenous microstructures in the similar welds. The corrosion resistance properties of the parent materials and similar welds were higher than that of the dissimilar weld sample. The dissimilar weld has a current density of 3.83×10−5 A/cm2 and corrosion rate of 9.99×10−4 mm/year; and is most susceptible to corrosion, due to the galvanic coupling between the dissimilar alloys and intermetallic compounds. The similar weld of AA1050 has a current density of 1.99×10−7 A/cm2 and corrosion rate of 1.44×10−3 mm/year, while the similar weld of AZ91D has a current density of 8.58×10−6 A/cm2 and corrosion rate of 1.13×10−1 mm/year.

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“…In this modern era, Mg alloys, especially low-density alloys (e.g., AZ80A), are widely used in various automobile and aerospace applications, including parts for gearboxes of helicopters, frames of bicycles, struts of landing gear, and hubs of rotors, because of their unique strength (specific strength) and rigidities, attractive capacities of damping, and stable dimension before and after machining [1,2]. Most components of Mg alloys are obtained through casting techniques, and some components are formed through other techniques, such as plastic forming.…”

Section: Introductionmentioning

confidence: 99%

Simulation of heat transfer and analysis of impact of tool pin geometry and tool speed during friction stir welding of AZ80A Mg alloy plates

Babu¹,

Sevvel²,

Kumar³

2020

J Mech Sci Technol

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Peak temperature arising during the joining of metals by friction stir welding (FSW) needs to be investigated along with other process parameters of FSW to understand their inevitable impact on joint quality. This investigational and experimental analysis aims to determine the impact of pin geometry and its rotational speed by formulating thermic mechanical process-based models to anticipate peak temperature and to compare it with actual values. Three distinctive pin geometries rotated at three speeds were used while other parameters were unchanged. The fitness and suitability of the model were verified by comparing the anticipated values with the experimental values. Macrographic and micrographic observations revealed that flawless joints with improved mechanical properties were fabricated at a peak temperature of 616 K (80 % melting temperature) when a taper cylindrical pin with a rotational speed of 818 rpm was employed. In addition, SEM analysis of the fractured specimen confirmed that failure of the defect free weldment occurred in brittle mode, indicating that preferred fusion of grains and their constituents occurred during the joining process. Compared with other solid-state and unconventional welding techniques, such as electron beam welding, laser beam welding, and plasma arc welding, FSW is cheaper and more cost effective and does not require filler material and shielding medium (or gas), strict safety measures due to the absence of molten spatter and toxic fumes, skilled labor, long operation period, and cool down period, thereby boosting production rate and efficiency; moreover, FSW can be employed to fabricate joints in all positions, including horizontal, vertical, and overhead [12][13][14].

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Electrochemical corrosion behaviour of stir zone of friction stir welded dissimilar joints of AA6061 aluminium–AZ31B magnesium alloys

Cited by 40 publications

References 19 publications

Application of the hybrid process ultrasound enhanced friction stir welding on dissimilar aluminum/dual‐phase steel and aluminum/magnesium joints

Application of the hybrid process ultrasound enhanced friction stir welding on dissimilar aluminum/dual‐phase steel and aluminum/magnesium joints

Electrochemical performance in seawater and microstructural evolution of friction stir welded joints of dissimilar AA1050 and AZ91D

Simulation of heat transfer and analysis of impact of tool pin geometry and tool speed during friction stir welding of AZ80A Mg alloy plates

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