Arc assisted ultrasonic seam welding of Mg/Al joints with Zn interlayer

Dai, Xiangyu; Zhang, Haimo; Zhang, H.; Liu, J.; Feng, Jicai

doi:10.1179/1743284715y.0000000070

Cited by 19 publications

(6 citation statements)

References 24 publications

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“…6(h-i) show the FESEM micrograph and EDX mapping of Zn element distribution in the severely deformed zone, which confirms the appropriate diffusion and presence of Zn elements in this area. The Mg and Zn elements are the main components at the joint interface and extremely deformed zone, which agrees well with the previously reported data [33,35]. TEM images from a region of stirred zone near the Mg interface in sample 4 are shown in Figs.…”

Section: Microstructural Observationsupporting

confidence: 91%

The effect of changing chemical composition on dissimilar Mg/Al friction stir welded butt joints using zinc interlayer

Abdollah-zadeh

Shokuhfar

Cabrera

et al. 2018

Journal of Manufacturing Processes

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In this study, solid state joining technology of friction stir welding (FSW) was carried out for Al and Mg butt joints.To improve the microstructural characteristics of the banded structure zone, before to the FSW process, a Zn interlayer was also inserted in the butt joints. Optimal conditions for friction stir welding were obtained using a combination of two travel speeds (25 and 35 mm/min) and three rotation speeds (550, 600 and 650 rpm). Mg-Zn and Mg-Al-Zn IMCs, Al solid solution and residual Zn were the most common phases in the stirred zone, eliminating Al-Mg intermetallic formation. The joint fabricated at 35 mm/min and 600 rpm, in which tensile strength of the weld improved from 141 to 175 MPa and an elongation from 0.7 to 1.9 was achieved, gave the maximum mechanical properties compared with the Zn free sample FSWed under identical conditions. The fracture micrographs were compatible with the corresponding ductility results and the fracture surfaces of Zn added samples possessed a fine texture combining brittle and ductile fracture features. Meanwhile, the hardness level was lower than that of the Zn free sample because of the change in the IMCs composition of the Zn added samples.

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Section: Microstructural Observationsupporting

confidence: 91%

The effect of changing chemical composition on dissimilar Mg/Al friction stir welded butt joints using zinc interlayer

Abdollah-zadeh

Shokuhfar

Cabrera

et al. 2018

Journal of Manufacturing Processes

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“…In addition, the β-Zn solid solution, which was a soft phase, dispersedly distributed in MgZn 2 intermetallic compound with a higher hardness. Dai et al [22] adopted the Zn interlayer in the arc-assisted ultrasonic seam welding of Al/Mg joints to replace the Al–Mg intermetallic compounds with β-Zn solid solution and MgZn 2 intermetallic compounds in the interface zone, which effectively improved the bonding strength of the welding joints. The β-Zn solid solution was more flexible and less brittle than the MgZn 2 intermetallic compounds.…”

Section: Resultsmentioning

confidence: 99%

Influence of a Zn Interlayer on the Interfacial Microstructures and Mechanical Properties of Arc-Sprayed Al/AZ91D Bimetals Manufactured by the Solid–Liquid Compound Casting Process

Zhao

Cheng

et al. 2019

Materials

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A novel technique combining solid–liquid compound casting (SLCC) with arc spraying was designed to manufacture the arc-sprayed Al/AZ91D bimetals with a Zn interlayer. The Al/Mg bimetal was produced by pouring the AZ91D melt into the molds sprayed with Al/Zn double-deck coating, during which the arc-sprayed Zn coating acted as the interlayer. The effect of the Zn interlayer on microstructures, properties, and fracture behaviors of arc-sprayed Al/AZ91D bimetals by SLCC was investigated and discussed in this study. The optimal process parameter was acquired by analyzing the results from different combinations between the arc-spraying time of the Zn coating (10, 18, and 30 s) and the preheat time of the Al/Zn double-deck coating (6 and 12 h). The interfacial microstructures of the arc-sprayed Al/AZ91D bimetals with a Zn interlayer could be approximately divided into two categories: One was mainly composed of (α-Mg + Al5Mg11Zn4) and (α-Al + Mg32(Al, Zn)49) structures, and the other primarily consisted of (α-Mg + Al5Mg11Zn4), (MgZn2 (main) + β-Zn), and (β-Zn (main) + MgZn2) structures. In the interface zone, the (α-Mg + Al5Mg11Zn4) structure was the most abundant structure, and the MgZn2 intermetallic compound had the highest microhardness of 327 HV. When the arc-spraying time of the Zn coating was 30 s and the preheat time of the Al/Zn double-deck coating was 6 h, the shear strength of the arc-sprayed Al/AZ91D bimetal reached 31.73 MPa. Most rupture of the arc-sprayed Al/AZ91D bimetals with a Zn interlayer occurred at the (α-Mg + Al5Mg11Zn4) structure and presented some typical features of brittle fracture.

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“…2b-f). The melting point of Zn is 419.5 °C which is lower than the peak temperature during FSLW [22]. The molten Zn in the SZ is stirred and transferred by the rotating pin and eventually dispersed in the SZ bottom.…”

Section: Methodsmentioning

confidence: 94%

Improving Joint Morphologies and Tensile Strength of Al/Mg Dissimilar Alloys Friction Stir Lap Welding by Changing Zn Interlayer Thickness

Liu

Niu

Ren

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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The pure Zn foils with different thicknesses (0.02, 0.05, 0.1, 0.2 and 0.3 mm) were selected as interlayers to improve the quality of friction stir lap welding joint of 7075-T6 Al and AZ31B Mg dissimilar alloys. The effects of the interlayer thickness on joint formation, microstructure and tensile strength were analyzed. The results displayed that the maximum length of the boundary between stir zone (SZ) and thermo-mechanically affected zone in lower plate was obtained by the addition of the Zn interlayer with 0.05 mm thickness. The Mg-Zn intermetallic compounds (IMCs) were discontinuously distributed in the SZ, replacing the continuous Al-Mg IMCs. The size of Mg-Zn IMCs increased with the increase in the thickness of the Zn interlayer. The maximum tensile shear strength of 276 N mm −1 was obtained by the addition of 0.05 mm Zn foil, which increased by 45.6% of that of the joint without the Zn foil addition.

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Arc assisted ultrasonic seam welding of Mg/Al joints with Zn interlayer

Cited by 19 publications

References 24 publications

The effect of changing chemical composition on dissimilar Mg/Al friction stir welded butt joints using zinc interlayer

The effect of changing chemical composition on dissimilar Mg/Al friction stir welded butt joints using zinc interlayer

Influence of a Zn Interlayer on the Interfacial Microstructures and Mechanical Properties of Arc-Sprayed Al/AZ91D Bimetals Manufactured by the Solid–Liquid Compound Casting Process

Improving Joint Morphologies and Tensile Strength of Al/Mg Dissimilar Alloys Friction Stir Lap Welding by Changing Zn Interlayer Thickness

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