Mechanical properties optimization of AZX612-Mg alloy joint by double-sided friction stir welding

Zhou, Mengran; Morisada, Yoshiaki; Fujii, Hidetoshi; Ishikawa, Takeshi

doi:10.1016/j.jmatprotec.2017.11.014

Cited by 47 publications

(27 citation statements)

References 9 publications

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“…These particles are the Al 2 Ca and the Al 8 Mn 5 predicted by the FactSage-FTlite™ calculations. Similar microstructural phases and particles have been observed in Ca containing Mg–Al alloys joined via FSW and friction stir processing (FSP), including studies on AZ91–1Ca (Mg–9Al–1Zn–1Ca) [ 42 ], AMX602 (Mg–6Al–0.5Mn–2Ca) [ 43 ], and AZX612 (Mg–6Al–1Zn–2Ca) [ 44 ]. Specifically, the microstructures in these alloys after FSW/FSP displayed a fine dispersion of Al 2 Ca and refined or dissolved β–Mg 17 Al 12 , similar to our observations on the AZ91/AZ91 and AZ91–2Ca/AZ91–2Ca welds joined via LFW.…”

Section: Resultsmentioning

confidence: 93%

Linear Friction Welding of an AZ91 Magnesium Alloy and the Effect of Ca Additions on the Weld Characteristics

et al. 2021

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Solid-state welding offers distinct advantages for joining reactive materials, such as magnesium (Mg) and its alloys. This study investigates the effect of linear friction welding (LFW) on the microstructure and mechanical properties of cast AZ91 (Mg–9Al–1Zn) and AZ91–2Ca alloys, which (to the best knowledge of the authors) has not been reported in the literature. Using the same set of LFW process parameters, similar alloy joints—namely, AZ91/AZ91 and AZ91–2Ca/AZ91–2Ca—were manufactured and found to exhibit integral bonding at the interface without defects, such as porosity, inclusions, and/or cracking. Microstructural examination of the AZ91/AZ91 joint revealed dissolution of the Al-rich second phase in the weld zone, while the Mn containing phases remained and were refined. In the AZ91–2Ca/AZ91–2Ca joint, the weld zone retained Ca- and Mn-rich phases, which were also refined due to the LFW process. In both joint types, extensive recrystallization occurred during LFW, as evidenced by the refinement of the grains from ~1000 µm in the base materials to roughly 2–6 µm in the weld zone. These microstructural changes in the AZ91/AZ91 and AZ91–2Ca/AZ91–2Ca joints increased the hardness in the weld zone by 32%. The use of digital image correlation for strain mapping along the sample gage length during tensile testing revealed that the local strains were about 50% lower in the weld zone relative to the AZ91 and AZ91–2Ca base materials. This points to the higher strength of the weld zone in the AZ91/AZ91 and AZ91–2Ca/AZ91–2Ca joints due to the fine grain size, second phase refinement, and strong basal texture. Final fracture during tensile loading of both joints occurred in the base materials.

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Section: Resultsmentioning

confidence: 93%

Linear Friction Welding of an AZ91 Magnesium Alloy and the Effect of Ca Additions on the Weld Characteristics

et al. 2021

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“…The Input from severe plastic deformation and exposure to high temperature within the stirred zone during FSW process leads to recrystallization and development of texture within the stirred zone. Thereby, resulting in precipitate dissolution and coarsening around and within the stirred zone [68,69]. Based on microstructural characterization of precipitates and grains, three distinct zones namely nugget zone (NZ), thermo-mechanically affected zone (TMAZ) and heat affected zone (HAZ) have been identified as shown in Figure 7.…”

Section: Characterization Of Fsw Zonesmentioning

confidence: 99%

Experimental investigation on the improvement of the properties of the AZ80A Mg alloy joints using friction stir welding process

Sevvel¹,

Mahadevan²,

Sateš³

et al. 2019

FME Transactions

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An experimental investigation was conducted with the basic objective of demonstrating the feasibility of joining the AZ80A Mg alloys using the technique of friction stir welding (FSW). Good quality joints free from defects were obtained for 5mm thickness AZ80A Mg alloy flat plates at a speed of rotation of 750 rpm with a traversing speed of 1.5 mm/min, by employing a FSW tool fabricated out of M35 grade High Speed Steel(HSS). It was experimetally observed that, the nugget zone (NZ) of the defect free weldments were found with fine sized, equally spaced & uniformly distributed grains when compared with that of the parent metal. Apart from this, the heat affected zone (HAZ) lying beside the NZ was found to possess larger sized near equaxied grains due to the effect of annealing. The weld zones were found to possess regions of slight softening nature when compared to that of the parent metal, arising from the dislocation of the lower densities. Moreover, the tensile strength of the defect free weldments was found to be around 78% of the parent metal, which seems to better than that of the strengths obtained using conventional joining techniques.

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“…The FSW tool shoulder executes the function of preventing the plasticized metal from escaping the surface of the workpiece, being welded. It also plays a vital role in generating the required amount of frictional heat in ideal volumes during the joining process [57][58][59]. Likewise, the careful consideration & care must be taken while designing the FSW tool pin profile, as it regulates the uniform flow of the plasticized material along the entire NZ (nugget zone), during the friction stir welding process [60,61].…”

Section: Materials and Geometry Of The Fsw Toolmentioning

confidence: 99%

Experimental study on the role of tool geometry in determining the strength & soundness of wrought Az80a Mg alloy joints during FSW process

Thangaiah¹,

Sevvel²,

Satheesh³

et al. 2018

FME Transactions

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An investigation was conducted to find out the influencing role of the geometry of the FSW tool on the tensile strength, corrosion resistance, wear rate of the wrought AZ80A Mg alloy joints during the FSW process. FSW tools with two uniquely different geometries, namely stepped cylindrical shoulder tool and stepless cylindrical shoulder tool were employed at different combinations of speeds of rotation and traversing speed. Comprehensive observations & investigations were also carried out regarding the tensile strength, wear losses & corrosion resistance of the fabricated joints. The joints fabricated using stepped cylindrical shoulder tool exhibited appreciable tensile strength values at combinations of higher traversing feeds and low values of rotational speeds of the FSW tool. At the same time, the joints possessing fine sized refined grains in their nugget zone have been found to exhibit higher wear losses.

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Mechanical properties optimization of AZX612-Mg alloy joint by double-sided friction stir welding

Cited by 47 publications

References 9 publications

Linear Friction Welding of an AZ91 Magnesium Alloy and the Effect of Ca Additions on the Weld Characteristics

Linear Friction Welding of an AZ91 Magnesium Alloy and the Effect of Ca Additions on the Weld Characteristics

Experimental investigation on the improvement of the properties of the AZ80A Mg alloy joints using friction stir welding process

Experimental study on the role of tool geometry in determining the strength & soundness of wrought Az80a Mg alloy joints during FSW process

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