Microstructures and properties of Al–Mg–SI alloy overhead conductor by horizontal continuous casting and continuous extrusion forming process

Ji, Xiankun; Zhang, Hui; Luo, Song; Jiang, Fulin; Fu, Dingfa

doi:10.1016/j.msea.2015.09.114

Cited by 46 publications

(11 citation statements)

References 23 publications

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“…11c). Therefore, it indicates that an improved microstructure homogenization process could be obtained during the whole process, especially at the stage of atomization [44]. In addition, the high packing density couples with the low porosity obtained in the processed samples account for the above phenomenon.…”

Section: Microstructure and Properties Of The Rramentioning

confidence: 96%

Microstructure and Properties of 7075Al Alloy Fabricated by Directly Combined of Spray Forming and Continuous Extrusion Forming under Different Atomization Gas Pressures

Chen

Zhong

Yin

et al. 2016

Acta Metall. Sin. (Engl. Lett.)

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A new process consisting of the spray forming and the continuous extrusion forming for manufacturing 7075Al alloy was proposed. The microstructure evolution, mechanical properties and the resistance to stress corrosion cracking of the alloy were studied. The results indicate that the spray forming process induces obviously grain refinement and greatly lower segregation microstructure. Besides, the Conform process produces finer grains and conduces to more uniform distribution of the precipitates of AlCu and MgZn 2 phases. The fabricated alloy shows good comprehensive mechanical properties and superb performance of stress corrosion resistance. Moreover, a better combination of the mechanical properties and the resistance to stress corrosion cracking could then be obtained under a certain condition of atomization gas pressure of 0.19 MPa. The enhanced properties are attributed to the following factors, which include the grain refinement, the fine and homogeneous distribution of AlCu and MgZn 2 phases, the high density of the extruded products, as well as the discontinuous distribution of the grain boundaries after retrogression and reaging (RRA) heat treatment.

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Section: Microstructure and Properties Of The Rramentioning

confidence: 96%

Microstructure and Properties of 7075Al Alloy Fabricated by Directly Combined of Spray Forming and Continuous Extrusion Forming under Different Atomization Gas Pressures

Chen

Zhong

Yin

et al. 2016

Acta Metall. Sin. (Engl. Lett.)

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“…The pressure-generating mechanism in the HYB-AM extruder is based on the principle of continuous rotary extrusion (CRE), also known as Conform extrusion [5,6]. Over the past several decades, the CRE process has been subjected to multiple studies, covering the range of Al, Cu, Mg and Ti alloys [7][8][9][10][11]. More recently, as FEM-modelling has become a viable tool for this type of problems, several studies have validated the relationships between simulations and full-scale experiments.…”

Section: The Hyb-am Processmentioning

confidence: 99%

Investigating the Mechanics of Hybrid Metal Extrusion and Bonding Additive Manufacturing by FEA

Blindheim

Welo

Steinert

2019

Metals

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Hybrid Metal Extrusion & Bonding Additive Manufacturing (HYB-AM) is a hybrid manufacturing technology for the deposition of layered metal structures. This new deposition process is a complex metal forming operation, yet there is significant lack of knowledge regarding the governing mechanisms. In this work, we have used finite element analysis (FEA) to study material flow in the extruder, as well as the conditions at the interfaces of the deposited extrudate and the substrate, aiming to identify and characterize the process parameters involved. Analysis of the material flow shows that the extrusion pressure is virtually independent of the deposition rate. Furthermore, from the simulations of the material deposition sequence, it is clearly visible how the contact pressure at the interface will drop below the bonding threshold if the feed speed is too high relative to the material flow through the die. The reduced pressure also leads to the formation of a 'gas-pocket' inside the die, thus further degrading the conditions for bonding. The analyses of the process have provided valuable insights for the further development and industrialization of the process. the process on a proof-of-concept level and exploring the potential of the process [3]. More recently, a full-scale experiment was carried out to assess the mechanical integrity of a deposited structure [4]. Microscopy analyses show that fully dense bonding interfaces can be achieved, though some voids can be observed between the individual stringers. Observations of fracture surfaces reveal areas of full metallic bonding; however, regions of kissing-bonds and lack of bonding are also visible. Through these full-scale experiments, the HYB-AM process has demonstrated its proof-of-concept and capability for processing advanced aluminium alloys. Nevertheless, this process is a complex metal forming operation, and the governing mechanisms need to be better understood in order to optimize the process towards industrialization.

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“…All aluminum alloy conductors (AAAC) are manufactured by cold drawing to their desired final diameters. There are many studies available in literature aiming to optimize the mechanical and electrical properties of AAACs [ 6 , 7 , 8 , 9 , 10 ]. As typical reductions in the cross-section can exceed 85%, the tensile strength of these metal alloys increases due to work-hardening.…”

Section: Introductionmentioning

confidence: 99%

Electrical Resistivity and Tensile Strength Relationship in Heat-Treated All Aluminum Alloy Wire Conductors

et al. 2021

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Thermal processing of all aluminum alloy conductors (AAAC) is an important step that is performed to enhance the electrical and mechanical properties after the drawing process. In these 6xxx alloys, mechanical strength and electrical conductivity are normally two mutually exclusive properties. With the increased demand for high performance power conductors, it is important to understand and control microstructural evolution processes (e.g., recovery and the formation of nanoscale precipitates) in these alloys for better electrical and mechanical characteristics. In this study, heat treatment was performed on as-drawn 6201 AAAC wire conductors. The variations in tensile strength and electrical resistivity were quantitatively studied as a function of both the treatment temperature and holding time. Two wire diameters commonly used in the manufacturing of medium and high voltage power cables were used: 1.7 mm and 3.5 mm. From the obtained data, significant changes in the electrical resistivity and tensile strength were observed with increasing the treatment time. For both wire diameters, it was observed that the correlation between strength and resistivity can be described by a simple exponential relationship. This link could be useful in predicting mechanical strength by monitoring electrical resistivity variations during industrial heat treatment of AAAC wire conductors.

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Microstructures and properties of Al–Mg–SI alloy overhead conductor by horizontal continuous casting and continuous extrusion forming process

Cited by 46 publications

References 23 publications

Microstructure and Properties of 7075Al Alloy Fabricated by Directly Combined of Spray Forming and Continuous Extrusion Forming under Different Atomization Gas Pressures

Microstructure and Properties of 7075Al Alloy Fabricated by Directly Combined of Spray Forming and Continuous Extrusion Forming under Different Atomization Gas Pressures

Investigating the Mechanics of Hybrid Metal Extrusion and Bonding Additive Manufacturing by FEA

Electrical Resistivity and Tensile Strength Relationship in Heat-Treated All Aluminum Alloy Wire Conductors

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