Microstructural evolution and mechanical properties during the friction stir welding of 7075-O aluminum alloy

Dehghani, K.; Ghorbani, R.; Soltanipoor, A.R.

doi:10.1007/s00170-014-6574-0

Cited by 52 publications

(22 citation statements)

References 27 publications

(45 reference statements)

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“…Meanwhile, due to the attractive combination of excellent weldability, high strength to weight ratio, high heat conductivity, and good corrosion resistance, AA7075 has been widely used to produce some components in aviation, aerospace fields, and domestic industries [1,2]. However, a few aluminum matrix parts pertaining to the cabin and cockpit are normally in irregular and complex configurations, which are difficult to fabricate by the conventional processing methods such as casting processes.…”

Section: Introductionmentioning

confidence: 99%

Formation characteristic, microstructure, and mechanical performances of aluminum-based components by friction stir additive manufacturing

Mao

Huang

et al. 2015

Int J Adv Manuf Technol

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In this study, a new solid-state technique of friction stir additive manufacturing (FSAM) based on friction stir welding (FSW) principle was used to build successfully a multilayered stack of an Al-based component. The results show that a hook stretches into the nugget zone on advancing side, while it moves upwards to the periphery on retreating side for a single-level welding. With manufacturing the second layer, the hooks bend outward significantly attributing to the extrusion of above plastic material, which can avoid the hook to stretch into the stirred zone. A transition zone (TZ) is also formed near the interface between two layers. In addition, fine equiaxed grains are observed due to the dynamic recrystallization in the whole. However, a difference in grain size still exists through the build direction and in the TZ is forming coarse band grains. A similar change occurs in the precipitate morphology, size, and distribution. Form the top to the bottom, the microhardness changes dramatically, and a maximum 115 HV at the top is obtained. The tensile strength of all the slices increases and the elongation decreases slightly in comparison of Al substrate, and the slice top has the highest mechanical properties, which is attributed to fine grains and desirable precipitate characterization.

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Section: Introductionmentioning

confidence: 99%

Formation characteristic, microstructure, and mechanical performances of aluminum-based components by friction stir additive manufacturing

Mao

Huang

et al. 2015

Int J Adv Manuf Technol

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“…It has proven to be an excellent and eco-friendly joining technology for aluminum alloys [2,3]. Recently, FSW has proven to be perfectly appropriate for welding high-melting temperature alloys, such as Fe- [4][5][6][7], Ni- [8], and Ti-based alloys [7].…”

Section: Introductionmentioning

confidence: 99%

Pitting corrosion susceptibility of friction stir welded lean duplex stainless steel joints

Atapour

Sarlak

Esmailzadeh

2015

Int J Adv Manuf Technol

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The effect of friction stir welding (FSW) on the pitting corrosion resistance of a lean duplex stainless steel was investigated in chloride-containing and chloride-free electrolytes. FSW was carried out by employing a constant rotation speed of 800 rpm at the welding speeds of 50, 100, and 150 mm/min using WC-based tool. Cyclic polarization results showed the same corrosion resistance of the base metal and welded joints in 0.1 M H 2 SO 4 . The optical microscopy observations after cyclic polarization tests revealed that no signs of pitting corrosion were evident for the base metal and different FS welds in chloride-free 0.1 M H2SO4 solution. In contrast, a wide positive hysteresis loop indicative of pitting corrosion susceptibility was displayed for the base metal and FS welds in 0.1 M H 2 SO 4 +0.1 M NaCl solution. The optical micrographs of pitting corrosion in the base metal and various FS welds demonstrated that the size of pits was decreased and the number of pits was increased after FSW. It was also found that increasing the welding speed led to an increase in the number of pits and a decrease in the size of pits. In other words, the resistance to pit growth was improved by decreasing the heat input during FSW. These results were interpreted with respect to the noticeable grain refinement that occurred during FSW.

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“…It has gathered wide acceptance in many structural applications due to its high strength to weight ratio, good resistance to corrosion and natural ageing characteristics [3,4]. In addition, AA6061 alloy (Al-Mg-Si alloy) belongs to a significant class of medium strength aluminum alloys widely used in aircraft applications, marine frames and storage tanks [5].…”

Section: Extended Abstractmentioning

confidence: 99%

Mechanical Properties of Dissimilar Friction Stir Welded Joints between AA7075-O and AA6061-O Alloys

Öztoprak¹,

Serіndağ²,

Yeni³

et al. 2016

World Congress on Mechanical, Chemical, and Material Engineering

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Extended AbstractFriction stir welding (FSW) is a new solid-state joining technique that was developed in 1991 by The Welding Institute (TWI) of UK. In particular, this process is utilized for welding high-strength metallic materials such as aluminum alloys, magnesium, copper and metal matrix composites (MMCs) that are hard to weld by traditional welding methods. In FSW process, the frictional heating is generated between the non-consumable tool and the workpiece. As a result of the heating, the workpiece undergoes intensive plastic flow at an elevated temperature that is under the melting point of the material. Attendantly, the plastic deformation introduces grain refinement owing to the dynamic recrystallization of the grains at the weld zone. There are many advantages of FSW process by comparison with conventional fusion welding technology. No additive materials, cover gas or flux is used in the process and this makes FSW technology a strong candidate for joining of the aforementioned materials. In addition, several types of joints such as butt and T butt joints or fillet joints can be simply welded by this significant technology [1].AA7075 alloy (Al-Zn-Mg-Cu alloy), which is one of the strongest aluminum alloys, is precipitation hardened wrought material commonly used in aircraft parts, gears and shafts, missile parts, aerospace and defence applications [2]. It has gathered wide acceptance in many structural applications due to its high strength to weight ratio, good resistance to corrosion and natural ageing characteristics [3,4]. In addition, AA6061 alloy (Al-Mg-Si alloy) belongs to a significant class of medium strength aluminum alloys widely used in aircraft applications, marine frames and storage tanks [5]. However, both alloys suffer from degraded mechanical properties especially in the heat affected zone (HAZ) subsequent to conventional fusion welding techniques [5,6]. Therefore, FSW is considered as an ideal candidate to join these materials which are known as non-weldable alloys by fusion welding processes.Joining of dissimilar monolithic metals is quite important so as to provide good mechanical performance and obtaining cost-effective joints. AA7075-O and AA6061-O alloys have common widespread applications [7]. Therefore, sound welding of these materials is a prerequisite and attractive in various applications. In this research, dissimilar welds were produced in 3.2 mm thick plates of AA7075-O and AA6061-O alloys by friction stir welding. The effect of welding parameters and material position on tensile strength of the joints and microhardness profiles across the welds were investigated. For this purpose, FSW was carried out with the combination of two different rotational speeds and one welding speed to obtain the effect of heat generation on the welding quality. The parameters were chosen by taking into consideration the results of preliminary experimental studies. Temperature distribution around the weld zone was also measured during the process by using a non-contact infrared thermometer and K...

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Microstructural evolution and mechanical properties during the friction stir welding of 7075-O aluminum alloy

Cited by 52 publications

References 27 publications

Formation characteristic, microstructure, and mechanical performances of aluminum-based components by friction stir additive manufacturing

Formation characteristic, microstructure, and mechanical performances of aluminum-based components by friction stir additive manufacturing

Pitting corrosion susceptibility of friction stir welded lean duplex stainless steel joints

Mechanical Properties of Dissimilar Friction Stir Welded Joints between AA7075-O and AA6061-O Alloys

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