Microstructural characterization and mechanical properties in friction stir welding of aluminum and titanium dissimilar alloys

Chen, Y.C.; Nakata, Kohei

doi:10.1016/j.matdes.2008.06.008

Cited by 242 publications

(101 citation statements)

References 23 publications

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“…They are applied in various fields such as thermal power station, nuclear industries, automobile, aerospace, etc. A number of dissimilar joints with aluminum, titanium, ferrous and many kinds of materials have been successfully formed by various methods from fusion welding to friction welding process [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…As design complexity and service demands increase, dissimilar welds with titanium alloys become a particular interest in the field of aerospace industry [3][4][5]. There have been a number of studies reporting the welding of dissimilar titanium alloys using various different welding processes, including friction stir welding [3], ultrasonic spot welding [4], linear friction welding (LFW) [5,6], tungsten inert gas welding [7] and electron beam welding [8].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Friction Welding Joints with Dissimilar Titanium Alloys

Zhao

2016

Metals

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Titanium alloys, which are important in aerospace application, offer different properties via changing alloys. As design complexity and service demands increase, dissimilar welding of the titanium alloys becomes a particular interest. Linear friction welding (LFW) is a relatively novel bond technique and has been successfully applied for joining titanium alloys. In this paper, dissimilar joints with Ti-6Al-4V and Ti-5Al-2Sn-2Zr-4Mo-4Cr alloys were produced by LFW process. Microstructure was studied via optical microscopy and scanning electron microscopy (SEM), while the chemical composition across the welded samples was identified by energy dispersive X-ray spectroscopy. Mechanical tests were performed on welded samples to study the joint mechanical properties and fracture characteristics. SEM was carried out on the fracture surface to reveal their fracture modes. A significant microstructural change with fine re-crystallization grains in the weld zone (WZ) and small recrystallized grains in the thermo-mechanically affected zone on the Ti-6Al-4V side was discovered in the dissimilar joint. A characteristic asymmetrical microhardness profile with a maximum in the WZ was observed. Tensile properties of the dissimilar joint were comparable to the base metals, but the impact toughness exhibited a lower value.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Friction Welding Joints with Dissimilar Titanium Alloys

Zhao

2016

Metals

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“…Chen et al [24] studied the properties of the area achieved by the friction stir buttwelding of titanium to aluminium dissimilar alloys. Mechanical properties were derived from the intermetallic compounds.…”

Section: Introductionmentioning

confidence: 99%

Friction Stir Welding of Dissimilar Joints Between Commercially Pure Titanium Alloy and 7075 Aluminium Alloy

2017

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SummaryIn this study, a joint between commercially pure titanium alloy and 7075 aluminium alloy was butt welded by using friction stir welding at a rotational speed of 1120 rpm and a traverse speed of 50 mmmin -1 . The evaluation of hardness and microstructure was performed by using scanning electron microscopy. The phases in the weld area were identified by applying the X-ray diffraction technique and the Energy Dispersive X-ray Spectroscopy (EDS) analysis was used for the evaluation of intermetallic compounds of the weld area. The weld zone is cone-shaped and consists of aluminium and titanium particles that play an important role in increasing hardness and tensile strength. The weld area has three zones, namely the titanium base metal zone, the aluminium base metal zone, and the titanium-aluminium intermetallic compound mixed zone. It was also observed that the joint area on the aluminium side includes the stirred area, the thermo-mechanically affected zone, and the heat-affected zone, while the titanium joint area contains the stirred zone and the heat-affected zone. The hardness value of the weld area was around 360 HV, which means that in this area, compared to the base metal of titanium and aluminium, hardness has increased by 6% and 20%, respectively. This can be attributed to severe plastic deformation and formation of intermetallic compounds of titanium and aluminium in this area.

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“…However, there have been few studies on the butt joining of titanium to a dissimilar high-strength aluminum alloy by FSW. [3][4][5][6] This study has focused on the reactions of an alloying element of Al alloys with Ti alloys at the joint interface during FSW and investigated the weldability of Al alloys and Ti alloys by FSW. Table 1 shows the chemical compositions of plates.…”

Section: Introductionmentioning

confidence: 99%

Dissimilar Metal Joining of 2024 and 7075 Aluminium Alloys to Titanium Alloys by Friction Stir Welding

Aonuma

Nakata

2011

Mater. Trans.

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The friction stir welding (FSW) process is a solid-state joining process and the joining temperature is lower than that used in the fusion welding processes. Therefore, for dissimilar metal welding, FSW is considered to offer several advantages over fusion welding. The present work investigated the weldability of duralumin and titanium alloys using friction stir welding. The aluminum plates used in this work were 2024-T3 and 7075-T651, and the titanium plates used were pure titanium and Ti-6Al-4V. The average tensile strength of the Ti/2024 FSW joints was 311 MPa, and the tensile strength of the Ti/2024 joint was higher than that of the Ti/7075 FSW joint when the joining conditions were the same. A mixed region of Ti alloy and Al alloy was observed at the joint interface, and the joints mainly fractured at this region, where there was an intermetallic compound layer. In this region, a TiAl 3 intermetallic compound was detected by XRD. Therefore, it can be understood that this TiAl 3 intermetallic compound affects the tensile strength of butt joints.

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Microstructural characterization and mechanical properties in friction stir welding of aluminum and titanium dissimilar alloys

Cited by 242 publications

References 23 publications

Microstructure and Mechanical Properties of Friction Welding Joints with Dissimilar Titanium Alloys

Microstructure and Mechanical Properties of Friction Welding Joints with Dissimilar Titanium Alloys

Friction Stir Welding of Dissimilar Joints Between Commercially Pure Titanium Alloy and 7075 Aluminium Alloy

Dissimilar Metal Joining of 2024 and 7075 Aluminium Alloys to Titanium Alloys by Friction Stir Welding

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