Tensile Properties of Friction Stir Welds of AA 7020 Aluminum Alloy

Heidarzadeh, Akbar; Barenji, Reza Vatankhah; Esmaily, Mohsen; Ilkhichi, Atabak Rahimzadeh

doi:10.1007/s12666-014-0508-2

Cited by 43 publications

(20 citation statements)

References 20 publications

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“…It has been utilized to weld and process different aluminum (Heidarzadeh et al 2015), Mg (Asadi et al 2012;2010b;Motalleb-nejad et al 2014;Faraji and Asadi 2011), and Cu (Farrokhi et al 2013) alloys, some of which are classified as practically unweldable alloys in use of conventional welding methods.…”

Section: Introductionmentioning

confidence: 99%

Microstructural simulation of friction stir welding using a cellular automaton method: a microstructure prediction of AZ91 magnesium alloy

Asadi

Givi

Akbari

2015

Int J Mech Mater Eng

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Background: Recently, some researchers have simulated FSW using FEM and studied the influence of process parameters and tool geometry on material flow, welding force, and temperature and strain distributions during friction stir processing. Additionally, in terms of microstructure modeling, various approaches such as the Cellular Automaton (CA) model have been developed to simulate microstructural evolution during plastic deformation processes. Method: In this work, a finite element model (FEM) is established to study the microstructure evolution during friction stir welding (FSW) of AZ91 magnesium alloy. To this aim, first, the hot compression tests at different temperatures and strain rates were carried out to achieve the flow stress curves. Then, the hardening parameter, the recovery parameter and the strain rate sensitivity were calculated according to flow stress results and using the Kocks−Mecking model. Next, a continuum based thermo-mechanically coupled rigid-viscoplastic FEM model was proposed in Deform-3D software to simulate the FSW of AZ91 magnesium alloy. To evaluate microstructure of the weld zone a model is proposed based on the combination of Cellular Automaton and Laasraoui-Jonas models.

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Section: Introductionmentioning

confidence: 99%

Microstructural simulation of friction stir welding using a cellular automaton method: a microstructure prediction of AZ91 magnesium alloy

Asadi

Givi

Akbari

2015

Int J Mech Mater Eng

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“…The experimental study used in this work is based on Heidarzadeh et al [40]. The material used in the experimental setup of FSW is an Al alloy (AA 7020) plate with a thickness of 4 mm and the following designated tensile properties: UTS of 400 MPa and 15% EL.…”

Section: Experimental Setup Of the Fsw Processmentioning

confidence: 99%

“…The tool used for FSW is made of H13 steel with the following dimensions: 12 mm shoulder, cylindrical pin with a 4 mm diameter, 3.8 mm length, and 2.5°tilt against the work pieces that were used [40].…”

Section: Experimental Setup Of the Fsw Processmentioning

confidence: 99%

“…The grain of the welded element is smaller when low heat is applied to the process compared with when high input is used. Fine grain size Table 1 Inputs used for the experimental set-up of FSW results in high UTS, whereas coarse grain results in low UTS [40]. The 46 samples (Table 2) are sufficient for training the GP approach.…”

Section: Experimental Setup Of the Fsw Processmentioning

confidence: 99%

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Characterization of the tensile properties of friction stir welded aluminum alloy joints based on axial force, traverse speed, and rotational speed

et al. 2016

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Friction stir welding (FSW) process has gained attention in recent years because of its advantages over the conventional fusion welding process. These advantages include the absence of heat formation in the affected zone and the absence of large distortion, porosity, oxidation, and cracking. Experimental investigations are necessary to understand the physical behavior that causes the high tensile strength of welded joints of different metals and alloys. Existing literature indicates that tensile properties exhibit strong dependence on the rotational speed, traverse speed, and axial force of the tool that was used. Therefore, this study introduces the experimental procedure for measuring tensile properties, namely, ultimate tensile strength (UTS) and tensile elongation of the welded AA 7020 Al alloy. Experimental findings suggest that a welded part with high UTS can be achieved at a lower heat input compared with the high heat input condition. A numerical approach based on genetic programming is employed to produce the functional relationships between tensile properties and the three inputs (rotational speed, traverse speed, and axial force) of the FSW process. The formulated models were validated based on the experimental data, using the statistical metrics. The effect of the three inputs on the tensile properties was investigated using 2D and 3D analyses. A high UTS was achieved, including a rotational speed of 1050 r/min and traverse speed of 95 mm/min. The results also indicate that 8 kN axial force should be set prior to the FSW process.

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“…However, both geometries require a optimum rotational speeds for avoiding internal defects. There was a greater grain refinement, higher hardness and improved strength in the stir zone using the scrolled tool geometry 21 . Submerged friction stir processing (SFSP) is a new variance to FSP.…”

Section: Introductionmentioning

confidence: 97%

Effect of Scroll Pin Profile and Tool Rotational Speed on Mechanical Properties of Submerged Friction Stir Processed AZ31B Magnesium Alloy

Ramaiyan

Santhanam

Muthuguru³

2018

Mat. Res.

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In this study, an effort has been made to choose an appropriate tool pin profile and rotational speed for a tool using a submerged friction stir processed hot rolled AZ31B magnesium alloy. A defect free process region was obtained using a novel tool shoulder, which consisted of a scroll. Three tool pin profiles, namely, simple cylindrical, stepped cylindrical and stepped square pin have been used. Tensile properties and fracture behavior revealed defect free friction stir processed specimens. The microstructural studies reveal the possibility of producing a defect free processed region using the stepped square pin tool geometry. The presence of fine recrystallized grains (1.99 µm) and the absence of defects in the processed region lead to higher hardness and superior tensile properties.

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Tensile Properties of Friction Stir Welds of AA 7020 Aluminum Alloy

Cited by 43 publications

References 20 publications

Microstructural simulation of friction stir welding using a cellular automaton method: a microstructure prediction of AZ91 magnesium alloy

Microstructural simulation of friction stir welding using a cellular automaton method: a microstructure prediction of AZ91 magnesium alloy

Characterization of the tensile properties of friction stir welded aluminum alloy joints based on axial force, traverse speed, and rotational speed

Effect of Scroll Pin Profile and Tool Rotational Speed on Mechanical Properties of Submerged Friction Stir Processed AZ31B Magnesium Alloy

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