Thermal cycles, microstructures and mechanical properties of AA7075-T6 ultrathin sheet joints produced by high speed friction stir welding

Yu, Ning; Liu, Yuanhao; Zhang, Pengxian; Huang, Jiankang; Yu, Xiaoquan

doi:10.1016/j.matchar.2022.111873

Cited by 21 publications

(5 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[36] As a consequence, there is a grain growth and the average size is larger in this region. The overall reduction in grain size to a few microns has been already reported for other face centered-cubic (fcc) metals, both with high [39][40][41] and medium to low stacking fault energy [42,43] and is related to the dynamic recrystallization which takes place during the process.…”

Section: Analysis Of the Joint Performed With The Tool Smentioning

confidence: 81%

Effect of Tool Geometry on the Microstructure of Friction Stir Welding of Copper and 316L Stainless Steel

Huser,

Martinez Celis,

Picot

et al. 2024

Adv Eng Mater

View full text Add to dashboard Cite

The microstructure evolution during dissimilar friction stir welding of copper with stainless steel 316L is studied. The welding is performed in transparence configuration using tools of two different geometries. The joints are characterized by optical microscopy, scanning and transmission electron microscopy, electron backscattered diffraction, and microhardness. The microstructure and crystallographic texture of base metals are significantly affected. The joint produced using a shoulder of 8 mm in diameter is characterized by a copper nugget with refined grains. The texture of copper is dominated by component of the shear texture. The steel beneath the tool shows a grain refinement with grains of sub‐micron size and a texture which is close to the ideal simple shear texture. For the joint produced by the 16 mm diameter tool shoulder, the nugget consists of large grains of copper, while the steel beneath the tool shows small recrystallized grains of micrometer size. The texture in the steel is dominated by the component of the shear texture. The Cu/316L interface in both types of joint is of very good quality. In a detailed study of the interface, it is revealed that the welding of metals is achieved by mutual intense mechanical interlocking without formation of any intermetallic compounds.

show abstract

Section: Analysis Of the Joint Performed With The Tool Smentioning

confidence: 81%

Effect of Tool Geometry on the Microstructure of Friction Stir Welding of Copper and 316L Stainless Steel

Huser,

Martinez Celis,

Picot

et al. 2024

Adv Eng Mater

View full text Add to dashboard Cite

show abstract

“…The peak temperature significant affects the material flow and elemental diffusion in the joint during μFSW. To estimate the peak temperature of Al alloy during FSW, the following equation was proposed 21 : The range of constant K is 0.65∼0.75, and the index α is 0.04∼0.06, Tm represents the melting point of the BM, and T denotes the peak temperature. To make the comparison of T more obvious under different ω/v , K is assumed to be 0.75 and α is assumed to be 0.06.…”

Section: Resultsmentioning

confidence: 99%

Effects of heat input on the intermetallic compounds and mechanical properties of Al/Cu joints fabricated by micro friction stir welding

Ni,

Liu,

Zhang

et al. 2024

Science and Technology of Welding and Joining

Self Cite

View full text Add to dashboard Cite

The 0.5 mm thickness ultra-thin sheets of 6061-T4 Al and T2 Cu were butt joined by micro friction stir welding under different ω/ν. When the ω/ν was 36, the welding process resulted in a defect-free joint. This joint exhibited the highest tensile strength (222 Mpa), which was similar to the Al BM. This joint failed in the heat-affected zone on the Al side, where the hardness was lowest, leading to a ductile fracture. When the ω/ν was 9, the welding process led to the formation of agglomerated intermetallic compounds (IMCs) in upper nugget zone (NZ), and the IMCs layer of Al2Cu and Al4Cu9 developed in lower NZ. Therefore, the joint strength was greatly weakened, resulting in failure at the Al/Cu interface. The fracture mode of the joint exhibited a mixture of ductile and brittle behaviors.

show abstract

“…On the other hand, different from the conventional FSW joints of precipitate- strengthened Al alloys whose strength was mainly decided by the welding speed [19,20], tool rotational speed also plays an important role in the mechanical properties of FSW Al–Li alloy joints. For a 5 mm thickness 2195-T8 alloy, it is indicated that the tensile strength was improved by increasing the tool rotational speeds from 700 to 1300 rpm [11], and a similar result was obtained in the study on the FSW of 2198-T8 alloy [9].…”

Section: Introductionmentioning

confidence: 99%

A feasible operational parameter window for enhancement of welding speed in friction stir welding of 2195-T8 Al–Li alloy

Wang

Zhang

et al. 2023

Science and Technology of Welding and Joining

View full text Add to dashboard Cite

The improvement of the welding speed becomes extraordinarily difficult for the friction stir welding (FSW) of Al-Li alloys with medium thickness (5-10 mm). In this study, 2195-T8 Al alloy plates with a thickness of 6 mm were subjected to FSW under different welding speeds of 200-800 mm/min with the objective of seeking an optimised welding parameter. The tensile strength of ∼ 422 MPa at a relatively high welding speed of 400 mm/min with a tool rotational speed of 800 rpm was obtained, which reached a comparable level to those of the joints with low welding speeds. The combination of moderate tool rotational speed and moderate welding speed was a feasible optimising direction for FSW of Al-Li alloy with medium thickness.

show abstract

Thermal cycles, microstructures and mechanical properties of AA7075-T6 ultrathin sheet joints produced by high speed friction stir welding

Cited by 21 publications

References 32 publications

Effect of Tool Geometry on the Microstructure of Friction Stir Welding of Copper and 316L Stainless Steel

Effect of Tool Geometry on the Microstructure of Friction Stir Welding of Copper and 316L Stainless Steel

Effects of heat input on the intermetallic compounds and mechanical properties of Al/Cu joints fabricated by micro friction stir welding

A feasible operational parameter window for enhancement of welding speed in friction stir welding of 2195-T8 Al–Li alloy

Contact Info

Product

Resources

About