Effects of Welding Speed and Post-weld Hot Rolling on Microstructure and Mechanical Properties of Friction Stir-Welded AZ31 Magnesium Alloy

Liu, Gang; Ma, Long; Ma, Zhenduo; Fu, Xuesong; Wei, Guobing; Yang, Yan; Xu, Tiancai; Xie, Weidong; Peng, Xiaodong

doi:10.1007/s40195-018-0725-5

Cited by 19 publications

(6 citation statements)

References 34 publications

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“…Aluminum and magnesium alloys, as two ideal materials for light weighting, are widely used in aerospace, automobile manufacturing, and other fields [1]. However, magnesium alloys have poor corrosion resistance and high brittleness, so Al/Mg dissimilar alloy welding is a hot research topic in order to improve the utilization of magnesium in recent years [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Traverse Speed on the Defect Characteristic, Microstructure, and Mechanical Property of Friction Stir Welded T‐Joints of Dissimilar Mg/Al Alloy

Sun

Shen

et al. 2020

Advances in Materials Science and Engineering

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The AZ31 B/2024-T4 T-lap-joint was successfully fabricated by friction stir welding (FSW) with different welding parameters. The defect characteristics and metallurgical structure were observed and analyzed using optical microscope (OM) and scanning electron microscopy (SEM). Besides, the effects of defects and welding parameters on mechanical properties were investigated. The results show that an effective metallurgical reaction zone can be formed between Mg and Al (Mg-Al MRZ) and the island structures and lamellar structures appeared in the Mg-Al MRZ. The T-joints without tunnel defects can be obtained and the excellent mechanical properties of the T-joint were achieved using the welding speed of 50 mm/min. The tensile strength along the skin and the stringer was mainly affected by the kiss bonding defects.

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Section: Introductionmentioning

confidence: 99%

Effect of Traverse Speed on the Defect Characteristic, Microstructure, and Mechanical Property of Friction Stir Welded T‐Joints of Dissimilar Mg/Al Alloy

Sun

Shen

et al. 2020

Advances in Materials Science and Engineering

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“…The need for increasing size and carrying capacity of the space launch vehicles led to the extensive use of highstrength aluminum alloy structures which need to be welded with friction stir welding (FSW). FSW is a solid-state welding process which made stronger welded joints of aluminum alloys than that welded with conventional fusion welding technologies benefited from the lower welding peak temperatures [1]. In general, two difficult challenges received increasingly attention for the FSW of large-scale aerospace aluminum alloy structures: the in situ repair of the welding defects and filling the keyhole at the end of the weld seam [2,3].…”

Section: Introductionmentioning

confidence: 99%

Improving the Weld Formation and Mechanical Properties of the AA-5A06 Friction Pull Plug Welds by Axial Force Control

Gao

Yang

Cui

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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In the present study, the weld formation and mechanical properties of the AA-5A06 friction pull plug welded (FPPW) joints were improved by controlling the axial force history. Several defect-free FPPW joints were made successfully by using the welding parameters of 15-20 kN/s axial loading rate, 20-30 kN axial welding force and 6-7 mm axial feeding displacement. The results indicated that using higher axial loading rate and axial welding force produced more stable heat generation and shorter frictional heating time between the frictional interface. In this case, the plastic flow of the materials around the hole could be further improved since the axial feeding displacement of the plug was increased. The maximum ultimate tensile strength (UTS) and elongation of the FPPW 5A06 joints were 314 MPa and 4.8%, respectively. The thermal mechanically affect zone (TMAZ) had the lowest hardness value throughout the joint and was found as the fracture location to all the tensile samples. The softening of TMAZ was mainly caused by the weakening of the cold work hardening and the coarsening of grains.

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“…Typically, the aluminum hollow extrusions are welded to form large-scale components. Friction stir welding (FSW) can produce low-distortion, high-quality, and low-cost joints, which makes it a promising method for joining the aluminum hollow extrusions [3]. The heat input and/or plastic deformation during FSW is sufficient to cause undesired microstructural evolution, thereby leading to localized softening in microhardness.…”

Section: Introductionmentioning

confidence: 99%

Relationship Between Microstructures and Microhardness in High-Speed Friction Stir Welding of AA6005A-T6 Aluminum Hollow Extrusions

Liu¹,

Liu

Yu³

2019

Acta Metall. Sin. (Engl. Lett.)

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AA6005A-T6 aluminum hollow extrusions were friction stir welded at a fixed high welding speed of 2000 mm/min and various rotation speeds. The results showed that the heat-affected zone (HAZ) retained the similar grain structure as the base material except some grain coarsening, and the density of dislocations and β′ precipitates were almost unchanged, indicating that the high welding speed inhibited the coarsening and dissolution of β″ precipitates via fast cooling rate. The thermo-mechanically affected zone (TMAZ) was characterized by elongated and rotated grains, in which a low density of β′ precipitates and the highest density of dislocations were observed. The highest heat input and severest plastic deformation occurring in the nugget zone (NZ) resulted in the occurrence of dynamic recrystallization and a high density of dislocations. Hence, all the β″ precipitates and most of the β′ precipitates dissolved into the matrix, and a few β′ precipitates were transformed into β precipitates. The microhardness was controlled by the precipitation and solution strengthening in the HAZ, by the dislocation and precipitation strengthening in the TMAZ, and by the fine-grain and dislocation strengthening in the NZ. With the increase in rotation speed, the peak and the lowest microhardness value increased monotonously.

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Effects of Welding Speed and Post-weld Hot Rolling on Microstructure and Mechanical Properties of Friction Stir-Welded AZ31 Magnesium Alloy

Cited by 19 publications

References 34 publications

Effect of Traverse Speed on the Defect Characteristic, Microstructure, and Mechanical Property of Friction Stir Welded T‐Joints of Dissimilar Mg/Al Alloy

Effect of Traverse Speed on the Defect Characteristic, Microstructure, and Mechanical Property of Friction Stir Welded T‐Joints of Dissimilar Mg/Al Alloy

Improving the Weld Formation and Mechanical Properties of the AA-5A06 Friction Pull Plug Welds by Axial Force Control

Relationship Between Microstructures and Microhardness in High-Speed Friction Stir Welding of AA6005A-T6 Aluminum Hollow Extrusions

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