Process mechanics in Friction Stir Extrusion of magnesium alloys chips through experiments and numerical simulation

Baffari, Dario; Buffa, Gianluca; Campanella, Davide; Fratini, Livan; Reynolds, Anthony P.

doi:10.1016/j.jmapro.2017.07.010

Cited by 67 publications

(22 citation statements)

References 30 publications

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“…This implies a mechanically rigid connection between wire and charge material while the applied rotation is converted in sliding friction condition between die and perimeter of the wire. The dependency of this surface macro-roughness on processing parameters has also been reported by Baffari et al [43]. In contrast, extrusion type 2 leads to a vastly different observation.…”

Section: Conditions For Homogeneous Microstructural Refinementsupporting

confidence: 75%

Changes in processing characteristics and microstructural evolution during friction extrusion of aluminum

et al. 2022

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This study focuses on characterizing the microstructural evolution of the aluminum alloy 7075 in the friction extrusion process under different extrusion forces and die angles. Depending on these conditions, two fundamentally different extrusion types are found, showing significant differences in the process characteristics and microstructural evolution. One of the two extrusion types is associated with high extrusion force and low die angle, leading to fully recrystallized wires with average grain size around 1.2 $$\upmu$$ μ m. The microstructural analysis indicates that the microstructure present in the wires is generated in the charge material by the combination of tool geometry, load induced material flow and friction conditions in the initial stages of the friction extrusion process. The identified processing conditions and influencing factors introduce an alternative route for friction extrusion at low extrusion ratios, capable of producing completely refined wires.

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Section: Conditions For Homogeneous Microstructural Refinementsupporting

confidence: 75%

Changes in processing characteristics and microstructural evolution during friction extrusion of aluminum

et al. 2022

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“…This is carried out using plastic working technology at an elevated temperature. For this purpose, (1) conventional methods of plastic working (direct extrusion [1][2][3], rolling [1,4]) as well as relatively new, (2) unconventional methods (Severe Plastic Deformation (SPD) [5][6][7][8][9], the KOBO method [10,11], friction stir extrusion [12] or friction back extrusion [13]) are used. In recent years, in this field, a significant increase in the number of publications on the subject has been observed.…”

Section: Introductionmentioning

confidence: 99%

“…In the context of solid state chips treatment, the most commonly processed metals are aluminum and its alloys [1,2,5,11,[13][14][15], followed by magnesium and its alloys [3,5,12,16,17], whereas there is relatively little data in the literature on the processing of chips of pure titanium and its alloys [4,[7][8][9][10]18].…”

Section: Introductionmentioning

confidence: 99%

Structural Aspects and Characterization of Structure in the Processing of Titanium Grade4 Different Chips

Topolski¹,

Jaroszewicz²,

Garbacz³

2021

Metals

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This study presents the structural aspects of the solid-state processing of various titanium chips. The structural characterization of: (1) commercial pure Ti in the as-received state, (2) manufactured chips, and (3) products of the chip processing are presented. Pure single-phase titanium Grade4 (Ti Gr4) was processed which, among all grades of pure titanium, is characterized by the lowest possible purity and the highest possible strength at the same time. Four geometries of chips were processed, i.e., chips after turning (thin and coarse), and chips after milling (thin and coarse). An unconventional plastic working method was applied to transform a dispersed form (chips) into solid, bulk metal in the form of rods without re-melting. The rods with a diameter of Ø8 mm and a length of about 500 mm were manufactured. Based on computer tomography and Archimedes measurements, it was found that the manufactured rods were consolidated and near fully dense. In turn, microscopy investigations proved that conventional, polycrystalline, grained structures were obtained. Only an insignificantly small number of internal defects were revealed, meaning that the obtained rods exhibited a proper structure typical for commercial titanium. Obtained materials, except of small surface inclusions, were fee of impurities. Whereas the results of the compression tests proved that the manufactured rods are characterized by new interatomic bonds, cohesion and plasticity analogous to those of titanium in the as-received state.

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“…Additionally, they modeled grain size evolution based on the dynamic recrystallization (DRX) kinetics laws. Baffari et al [15] proposed a 3D Lagrangian thermo-mechanically coupled numerical model using DEFORM3D software for FSBE of AZ31 magnesium wire and approved the model by temperature measurements. They also investigated the process mechanics to attain information on the material flow over the process as well as on the final product surface quality as a function of the tool plunging force and rotational speed.…”

Section: Introductionmentioning

confidence: 99%

Brass Wire Forming By Friction Stir Back Extrusion: Numerical Modeling and Experiment

Akbari

Asadi

2021

Preprint

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Friction stir back extrusion (FSBE) is used to produce brass wires and then, Numerical modeling is developed to simulate the FSBE of brass based on the Coupled Eulerian-Lagrangian technique (CEL) and verified by experiments. Next, the effects of FSBE parameters such as tool rotational and plunging speed on the strain and temperature distributions, microstructure, and patterns of material flow are studied. The results show that, the highest temperature and strain occurs near the tool/workpiece interface, but in a further distance from the tool axis. Additionally, in the cross section of a FSBE wire, the microstructure is finer in the periphery of the sample. A higher rotational speed or a lower plunging speed results in a coarser microstructure. The material flow pattern during the process is conical helix, and does not change meaningfully by the process parameters. The points at the further distance from the tool axis, along with an upward movement, experience an inward spiral movement which is amplified by higher rotational speed. However, the materials very near the tool axis almost take an upward movement and endure a very lower strain.

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Process mechanics in Friction Stir Extrusion of magnesium alloys chips through experiments and numerical simulation

Cited by 67 publications

References 30 publications

Changes in processing characteristics and microstructural evolution during friction extrusion of aluminum

Changes in processing characteristics and microstructural evolution during friction extrusion of aluminum

Structural Aspects and Characterization of Structure in the Processing of Titanium Grade4 Different Chips

Brass Wire Forming By Friction Stir Back Extrusion: Numerical Modeling and Experiment

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