Recent Advances in Friction Stir Welding/Processing of Aluminum Alloys: Microstructural Evolution and Mechanical Properties

Y., Z.; Feng, A.H.; Chen, D. L.; Shen, Junjun

doi:10.1080/10408436.2017.1358145

Cited by 270 publications

(103 citation statements)

References 563 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…They also demonstrated that in 7075 the welding temperatures can be sufficient to dissolve secondary phases in the matrix, i.e., the η' and η phases, but also noted that grain refinement in the stir zone due to dynamic recrystallization can contribute to a hardness recovery in this process zone. Consistent with the observations presented here, Dumont et al [21] noted that in friction stir-welds of 7449, hardness recovery in the stir zone occurs with natural aging and the precipitation of GP zones [8]. Interestingly, Santos et al [20] utilized electrical conductivity to map the precipitate distribution across friction stir welds of 7075-T6 and revealed an inverse correlation between the hardness and electrical conductivity.…”

Section: Methodssupporting

confidence: 83%

“…In fact, the placement of the alloys on either the advancing or retreating sides significantly influences the final weld properties. As noted by Ma et al [8] in their review of friction stir-welding and processing in aluminum alloys, the theoretical prediction of heat generation, material flow and mechanical properties in dissimilar friction stir-welding is challenging.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerically Based Phase Transformation Maps for Dissimilar Aluminum Alloys Joined by Friction Stir-Welding

Hamilton

Dymek

Kopyściański

et al. 2018

Metals

View full text Add to dashboard Cite

Sheets of aluminum 2017A-T451 and 7075-T651 were friction stir-welded in a butt-weld configuration. An existing computational model of the welding process for temperature distribution and material flow was adapted to estimate the phase transformations that occur across the weld zone. Near the weld center, process temperatures are sufficient to fully dissolve the equilibrium η phase in 7075 and partially dissolve the equilibrium S phase in 2017A. Upon cooling, Guinier-Preston (GP) and Guinier-Preston-Bagaryatsky (GPB) zones re-precipitate, and hardness recovers. Due to the more complete dissolution of the equilibrium phase in 7075, the hardness recovery skews toward whichever side of the weld, i.e., the advancing or retreating side, represents the 7075 workpiece. Phase transformation maps generated by the numerical simulation align not only with the hardness profiles taken across the weld zone, but also with positron lifetimes obtained through positron annihilation lifetime spectroscopy (PALS). Boundaries between the aluminum matrix and the secondary phases provide open volumes to trap positrons; therefore, positron lifetimes across the weld correspond with the phase transformations that occur in 7075 and 2017A during processing.

show abstract

Section: Methodssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Numerically Based Phase Transformation Maps for Dissimilar Aluminum Alloys Joined by Friction Stir-Welding

Hamilton

Dymek

Kopyściański

et al. 2018

Metals

View full text Add to dashboard Cite

show abstract

“…The shoulder of the tool has a forging action as it restricts the expulsion of plasticized material from the BM, while the pin extrudes material and produces a material flow between the advancing side (AS) and the retreating structural applications. More recently, Ma et al [3] published a critical review paper on recent developments in FSW of Al alloys. Al alloys have remained the prime selection for structural material in aerospace, shipbuilding and automotive industries for their excellent strength to weight ratio.…”

Section: Introductionmentioning

confidence: 99%

Friction Stir Welding of Dissimilar Aluminum Alloy Combinations: State-of-the-Art

Patel

Wang

et al. 2019

Metals

112

View full text Add to dashboard Cite

Friction stir welding (FSW) has enjoyed great success in joining aluminum alloys. As lightweight structures are designed in higher numbers, it is only natural that FSW is being explored to join dissimilar aluminum alloys. The use of different aluminum alloy combinations in applications offers the combined benefit of cost and performance in the same component. This review focuses on the application of FSW in dissimilar aluminum alloy combinations in order to disseminate research this topic. The review details published works on FSWed dissimilar aluminum alloys. The detailed summary of literature lists welding parameters for the different aluminum alloy combinations. Furthermore, auxiliary welding parameters such as positioning of the alloy, tool rotation speed, welding speed and tool geometry are discussed. Microstructural features together with joint mechanical properties, like hardness and tensile strength measurements, are presented. At the end, new directions for the joining of dissimilar aluminum alloy combinations should guide further research to extend as well as to improve the process, which is expected to raise further interest on the topic.

show abstract

“…Those particles were quite small in comparison to those of grains in the stir zone. The literature survey indicates that the kissing bonds are composed of oxide particles [54][55][56]. The initial butted surfaces with oxide layer are exposed to a large plastic deformation mechanism, making the oxide layer disintegrated and displaced by the material flow originated from the effect of the pin stirring action [13,57,58].…”

Section: Microstructural Observationmentioning

confidence: 99%

Effect of pin offset on the mechanical properties of friction stir welded AA 6013 aluminum alloy plates

Kasman

Ozan²

2019

Materialwissenschaft Werkst

View full text Add to dashboard Cite

In this study, AA 6013 aluminum plates were butt‐welded with friction stir welding via pin offset technique. Macrostructural observations revealed that kissing bonds, originated from the broken oxide layers, were found to occur in the welded joints. The fracture location of welded joints after tensile tests was found to be outside the joint area, revealing that kissing bonds which were formed in the stir zone exhibited no detrimental effect on the mechanical properties of joints. Microstructural observations revealed that phases belonging to Mg2Si, Al4Cu2Mg8Si7 and Al(MnFe)Si were observed in the x‐ray diffraction pattern of friction stir welded joints. The highest tensile strength with a value of 206 MPa was achieved with the process parameters of 1.5 mm pin offset towards the advancing side and 500 min−1 tool rotational speed, leading the ratio of tensile strength of joint to ultimate tensile strength of base metal, also known as joint efficiency, to reach 74 %.

show abstract

Recent Advances in Friction Stir Welding/Processing of Aluminum Alloys: Microstructural Evolution and Mechanical Properties

Cited by 270 publications

References 563 publications

Numerically Based Phase Transformation Maps for Dissimilar Aluminum Alloys Joined by Friction Stir-Welding

Numerically Based Phase Transformation Maps for Dissimilar Aluminum Alloys Joined by Friction Stir-Welding

Friction Stir Welding of Dissimilar Aluminum Alloy Combinations: State-of-the-Art

Effect of pin offset on the mechanical properties of friction stir welded AA 6013 aluminum alloy plates

Contact Info

Product

Resources

About