Effect of thermal tempering on microstructure and mechanical properties of Mg-AZ31/Al-6061 diffusion bonding

Rizi, Mohsen Saboktakin; Jafarian, Mojtaba; Honarmand, Mehrdad; Javadinejad, Hamid Reza; Ghaheri, Ali; Bahramipour, Mohammad Taghi; Ebrahimian, Marzieh

doi:10.1016/j.msea.2016.04.011

Cited by 51 publications

(14 citation statements)

References 21 publications

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“…Kirkendall voids were formed on the magnesium side, due to the higher coefficient of diffusion of magnesium atoms in aluminum, Figure 6. This is not in accordance with other researchers, who did not observe similar phenomena for diffusion bonding of aluminum and magnesium [27]. Additionally, multitude of precipitates which originate from the aluminum and magnesium alloying are observed at the interface, Figure 6.…”

Section: Resultscontrasting

confidence: 70%

Effect of bonding temperature on microstructure and intermetallic compound formation of diffusion bonded magnesium/aluminum joints

Mofid

Loryaei

2020

Materialwissenschaft Werkst

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The diffusion bonding of two dissimilar alloys Aluminum 5083 and Magnesium AZ31 was carried out at 420°C, 430°C,440°C and 450°C for bonding time of 60 min. In order to characterize the microstructure evolution in the joint zone, scanning electron microscopy, energy dispersive spectroscopy and x-ray diffraction were applied. The results show that joint formation is attributed to the solid-state diffusion of magnesium and aluminum into Aluminum 5083 and Magnesium AZ31 alloys followed by eutectic formation and constitutional liquation along the interface. At bonding temperature of 430°C diffusion induced grain coarsening was observed at the interface. With increase in bonding temperature, the atomic diffusivity increases, results in easier and speeder chemical bonding. In bonding temperature of 440°C the weld had an irregular shaped region in the weld center, having a different microstructure from the two base materials. The irregular shaped region contained a large volume of intermetallic compound Al 12 Mg 17 and showed significantly higher hardness in the weld center. The present study suggests that constitutional liquation resulted in the intermetallic compound Al 12 Mg 17 in the weld center.Keywords: Diffusion bond / aluminum alloy / magnesium alloy / microstructure / intermetallic Schlüsselwörter: Diffusionsbindung / Aluminiumlegierung / Magnesiumlegierung / Gefüge / intermetallisch Effect of bonding temperature on microstructure and intermetallic compound formation Materialwiss. Werkstofftech.

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Section: Resultscontrasting

confidence: 70%

Effect of bonding temperature on microstructure and intermetallic compound formation of diffusion bonded magnesium/aluminum joints

Mofid

Loryaei

2020

Materialwissenschaft Werkst

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“…EDS spectra results indicated that these fragments obtained from the diffusion layer were Al 3 Mg 2 phase. Jafarian et al 37 demonstrated the brittle IMC, Al 3 Mg 2 and Al 12 Mg 17 , were generated in the bonding interface and that the micro-hardness of Al 3 Mg 2 was obviously higher than that of its Al 12 Mg 17 counterpart. This is implied that Al 3 Mg 2 layer is deemed to play the part of the origin of interface delamination and the zone of crack initiation.…”

Section: Mechanical Properties Of Composite Platesmentioning

confidence: 99%

Microstructure and Mechanical Properties of AA6061/AZ31B/AA6061 Composite Plates Fabricated by Vertical Explosive Welding and Subsequent Hot Rolling

et al. 2018

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In this study, three-ply Al/Mg/Al composite plates were successfully achieved by vertical explosive welding (EXW) method. After EXW, the sound joints were obtained. Then thin three-ply Al/Mg/Al EXWed composite plates with the thickness of 1.78 mm were achieved by hot rolling. The influence of annealing on the interface microstructures and mechanical properties of the thin composite plates was investigated. The results indicated that different morphology with big waveform and mini waveform was present in the explosively bonded interface. The interface shear strength was 91MPa for big waveform side and 92Mpa for mini waveform side. The rolled sample without annealing possessed the high ultimate tensile strength (UTS) value of 235Mpa and elongation of 8.5%. The equiaxed and homogeneous grain morphology of magnesium alloys in the thin three-ply Al/Mg/Al composite plates could be induced by annealing 300°C for 1 h. This contributed to the considerable increase of elongation by 18.5%.

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“…In particular, the bonding of Al and Mg alloys is not possible by classical welding methods because of unexpected phase formation in the joint area. Among solid-state welding techniques for joining such alloys, the following processes could be cited: friction welding, explosive welding, transient liquid phase bonding and diffusion bonding [5][6][7] . Friction-stir welding [8][9][10][11][12] of Mg-Al can achieve relatively high joining strength comparing other methods, but for the direct contact of base Mg and Al, there are also Mg-Al intermetallic compounds in the joints.…”

Section: Introductionmentioning

confidence: 99%

“…They also confirmed that the solidified droplets melted at 436 and 449 ℃ by differential scanning calorimetry, nearly identical to the eutectic temperatures. Many experimental studies have been done for diffusion bonding 4,5,14,15) . The outstanding process parameters in diffusion bonding are: bonding temperature, bonding pressure, holding time and surface roughness of the alloys to be joined It has been found that bonding temperature has a greater influence on shear strength and bonding strength of the joints followed by bonding pressure, holding time, and surface roughness 14) .…”

Section: Introductionmentioning

confidence: 99%

Formation of Intermetallic Compounds at the Interface of the Friction Stir Weld and Diffusion Bond of Mg-AZ31/Al-5083 Joint

Mofid

Loryaei

Heidary

2019

Journal of Welding and Joining

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Dissimilar Friction stir and Diffusion bond welds of Al alloy 5083 and Mg alloy AZ31 were produced. The maximum temperature at the advancing side of friction stir weld rose to a maximum of 435℃. This temperature was selected as the bonding temperature, for diffusion bonding of these two alloys. The diffusion bonding time was 60 min. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) were used to investigate the compositional changes across the joint region. Dissimilar FS weld, produced layers of new phases of Al 12 Mg 17 and Al 3 Mg 2 intermetallics. DB weld, produced a melted-andsolidified eutectic structure consists a hypo-eutectic structure in the middle of the joint and a two layer structure between the eutectic and the Al base. The shear strength of joint corresponding to DB welded specimen was 43.2 MPa. The tensile strength of joint corresponding to FS welded specimen was 51.3 MPa. The present study suggests that constitutional liquation resulted in the intermetallic compound formation in the weld center.

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Effect of thermal tempering on microstructure and mechanical properties of Mg-AZ31/Al-6061 diffusion bonding

Cited by 51 publications

References 21 publications

Effect of bonding temperature on microstructure and intermetallic compound formation of diffusion bonded magnesium/aluminum joints

Effect of bonding temperature on microstructure and intermetallic compound formation of diffusion bonded magnesium/aluminum joints

Microstructure and Mechanical Properties of AA6061/AZ31B/AA6061 Composite Plates Fabricated by Vertical Explosive Welding and Subsequent Hot Rolling

Formation of Intermetallic Compounds at the Interface of the Friction Stir Weld and Diffusion Bond of Mg-AZ31/Al-5083 Joint

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