Application of linear friction welding for joining ultrafine grained aluminium

Orłowska, Marta; Olejnik, Lech; Campanella, Davide; Buffa, Gianluca; Morawiński, Ł.; Fratini, Livan; Lewandowska, M.

doi:10.1016/j.jmapro.2020.05.012

Cited by 22 publications

(6 citation statements)

References 38 publications

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“…The elongation of FW joints could also decrease by 50% because the applied pressure affects the deformation of the material during FW. 15,16) Furthermore, the increased grain size (slip length) and decreased ¢ phase content were attributed to a decrease in elongation as the upset length increased.…”

Section: Mechanical Properties Of Friction Welded Ti6al4vmentioning

confidence: 99%

Microstructures and Mechanical Properties of Friction Welded Ti–6Al–4V Alloy

Kim

Song²,

Jeong

2022

Mater. Trans.

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We investigated the relationship between the microstructure and mechanical properties of Ti6Al4V alloy subjected to friction welding (FW). In this work, specimens with a diameter of 15 mm and length of 50 mm were prepared, and FW was performed at a constant rotation speed (1600 rpm) and different upset lengths (1 mm and 3 mm). The electron backscattered diffraction (EBSD) method was used to analyze the grain boundary characteristic distributions (GBCDs) such as the grain size, misorientation angle, and the phase distributions for the weld zone and base material. We found that the microstructures in the weld zone were developed by a combination of continuous dynamic recrystallization and phase transformation. In addition, a decrease in the upset length led to accelerated grain refinement, and the average grain sizes in weld zone were refined from that of the base material (5.75 µm) to 1.45 µm and 1.85 µm at upset lengths of 1 and 3 mm, respectively. Consequently, the maximum microhardness value increased by ³20% at an upset length of 1 mm relative to the base material, and the yield and tensile strengths of the welded materials were maintained at the same levels as those of the base material. Therefore, based on the developed microstructure and mechanical properties, the application of FW to Ti6Al4V alloy could be obtained joints with superior performance.

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Section: Mechanical Properties Of Friction Welded Ti6al4vmentioning

confidence: 99%

Microstructures and Mechanical Properties of Friction Welded Ti–6Al–4V Alloy

Kim

Song²,

Jeong

2022

Mater. Trans.

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“…Compared with unprocessed coarse grain (CG) samples, UFG materials generally have more excellent physical properties, mechanical properties, and forming properties [5][6][7][8][9]. For example, its flow stress during deformation at high temperatures should be significantly reduced, and at the same time, there are also excellent applications in the field of superplasticity [10,11]. Recently, a series of reports showed that SPD could produce materials that combine high strength and high ductility [12,13].…”

Section: Introductionmentioning

confidence: 99%

Microhardness and Microstructural Evolution of Pure Nickel Processed by High-Pressure Torsion

Sun

Ding

et al. 2023

Crystals

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High-purity Ni was processed by high-pressure torsion (HPT) at room temperature under an imposed pressure of 6.0 GPa and a rotation rate of 1 rpm through 1/4 to 10 turns, and samples were then examined using Electron Back-Scattered Diffraction (EBSD) and microhardness measurements. The results show that the grain size and low-angle grain boundaries (LAGBs) gradually decrease with the growth of HPT revolutions while the microhardness values gradually increase. After 10 turns of HPT processing, ultrafine-grained (UFG) pure Ni with a reasonable microhardness value and microstructure homogeneity can be achieved across the disk, thereby giving great potential for applications in micro-forming. A grain refinement model for severe plastic deformation (SPD) of pure Ni is proposed.

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“…The undoubted advantage of the solid-state joining process in terms of joining highly deformed materials is that during friction welding of the same materials, the process takes place below its melting point. Despite the advantages of using materials with a fine microstructure and solid-state joining methods, a few publications describe friction welding of UFG and most of them concern joining metals and their alloys with quite high plasticity [ 37 , 38 ]. However, the described results confirm the possibility of obtaining (with appropriately selected parameters) limiting the degradation of the microstructure and the loss of increased properties of the native material in the heat-affected zone.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Investigation of a Friction-Welded 316L Stainless Steel with Ultrafine-Grained Structure Obtained by Hydrostatic Extrusion

et al. 2021

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The paper presents the microstructural investigation of a friction-welded joint made of 316L stainless steel with an ultrafine-grained structure obtained by hydrostatic extrusion (HE). Such a plastically deformed material is characterized by a metastable state of energy equilibrium, increasing, among others, its sensitivity to high temperatures. This feature makes it difficult to weld ultra-fine-grained metals without losing their high mechanical properties. The use of high-speed friction welding and a friction time of <1 s reduced the scale of the weakening of the friction joint in relation to result obtained in conventional rotary friction welding. The study of changes in the microstructure of individual zones of the friction joint was carried out on an optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and electron backscattered diffraction (EBSD) analysis system. The correlation between the microstructure and hardness of the friction joint is also presented. The heat released during the high-speed friction welding initiated the process of dynamic recrystallization (DRX) of single grains in the heat-affected zone (HAZ). The additional occurrence of strong plastic deformations (in HAZ) during flash formation and internal friction (in the friction weld and high-temperature HAZ) contributed to the formation of a highly deformed microstructure with numerous sub-grains. The zones with a microstructure other than the base material were characterized by lower hardness. Due to the complexity of the microstructure and its multifactorial impact on the properties of the friction-welded joint, strength should be the criterion for assessing the properties of the joint.

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Application of linear friction welding for joining ultrafine grained aluminium

Cited by 22 publications

References 38 publications

Microstructures and Mechanical Properties of Friction Welded Ti–6Al–4V Alloy

Microstructures and Mechanical Properties of Friction Welded Ti–6Al–4V Alloy

Microhardness and Microstructural Evolution of Pure Nickel Processed by High-Pressure Torsion

Microstructural Investigation of a Friction-Welded 316L Stainless Steel with Ultrafine-Grained Structure Obtained by Hydrostatic Extrusion

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