The Microstructure and Conductivity of Copper–Aluminum Composites Prepared by Rotary Swaging

Рогачев, С. О.; Сундеев, Р.В.; Андреев, В. А.; Andreev, Nikolay V.; Табачкова, Н. Ю.; Короткова, Н. О.

doi:10.1134/s0031918x22601640

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…Among the clad composites consisting of metals featuring the FCC lattice are those combining Al and Cu. As wires manufactured from this combination of metals are very promising for prospective usage as electric conductors with decreased weight and increased longevity, they have been widely researched and fabricated in various types, from relatively simple designs (Cu tube with Al core [93] and initial tubes inserted within-two layers [94] and three layers [95]), through sheets with inserted filaments (both Al sheet + Cu filaments [96] and Cu sheet + Al filaments [97]), to complex designs (Al sheet with peripheral Cu lamellas and Cu core [98,99]).…”

Section: Fcc Compositesmentioning

confidence: 99%

Structural Phenomena Introduced by Rotary Swaging: A Review

Kunčická

2024

Materials

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Rotary swaging is an industrially applicable intensive plastic deformation method. Due to its versatility, it is popular, especially in the automotive industry. Similar to the well-known methods of severe plastic deformation (SPD), rotary swaging imparts high shear strain into the swaged materials and thus introduces grain refinement down to a very fine, even ultra-fine, level. However, contrary to SPD methods, one of the primary characteristics of which is that they retain the shapes and dimensions of the processed sample, rotary swaging enables the imparting of required shapes and dimensions of workpieces (besides introducing structure refinement and the consequent enhancement of properties and performance). Therefore, under optimized conditions, swaging can be used to process workpieces of virtually any metallic material with theoretically any required dimensions. The main aim of this review is to present the principle of the rotary swaging method and its undeniable advantages. The focus is primarily on assessing its pros and cons by evaluating the imparted microstructures.

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Section: Fcc Compositesmentioning

confidence: 99%

Structural Phenomena Introduced by Rotary Swaging: A Review

Kunčická

2024

Materials

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“…In the case of the second group of methods, the volumes of the processed samples are virtually unlimited. One of the IPD processes is rotary swaging (RS), which advantageously imposes shear strain increments to the workpiece and thus enables the processing of materials with limited formability [37][38][39][40][41]. As it is a (near) net shape forming technology, which can be used to commercially produce long products of various cross-sectional geometries with no need for further machining, it is a promising processing method even for tool steels.…”

Section: Introductionmentioning

confidence: 99%

Influence of Imposed Strain on Weldability of Dievar Alloy

Izák,

Benč,

Kunčická

et al. 2024

Materials

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The presented work is focused on the influence of imposed strain on the weldability of Dievar alloy. Two mechanisms affecting the microstructure and thus imparting changes in the mechanical properties were applied—heat treatment (hardening and tempering), and rotary swaging. The processed workpieces were further subjected to welding with various welding currents. In order to characterize the effects of welding on the microstructure, especially in the heat-affected zone, and determine material stability under elevated temperatures, samples for uniaxial hot compression testing at temperatures from 600 to 900 °C, optical and scanning electron microscopy, and microhardness testing were taken. The testing revealed that, although the rotary swaged and heat-treated samples featured comparable microhardness, the strength of the swaged material was approximately twice as high as that of the heat-treated one—specifically 1350 MPa. Furthermore, it was found that the rotary swaged sample exhibited favorable welding behavior when compared to the heat-treated one, when the higher welding current was applied.

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“…During swaging, the imposed small shear strain increments gradually refine the grain size via repeating the chain of grain fragmentation-substructure formation-grain nucleation. Given by its advantageous stress state and incremental character, swaging can be used to process challenging materials (e.g., composites of various types [ 44 , 45 , 46 , 47 , 48 ], materials with low plasticity, challenging and hardenable alloys [ 49 , 50 , 51 , 52 , 53 , 54 ], materials strengthened with oxide dispersions (ODS) [ 55 , 56 , 57 ], etc.). Swaging can also be used to process powder-based pre-sintered or additively manufactured workpieces to reduce the residual porosity, improve density, and enhance properties [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Structure Development on Performance of Copper Composites Processed via Intensive Plastic Deformation

2023

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Designing a composite, possibly strengthened by a dispersion of (fine) oxides, is a favorable way to improve the mechanical characteristics of Cu while maintaining its advantageous electric conductivity. The aim of this study was to perform mechanical alloying of a Cu powder with a powder of Al2O3 oxide, seal the powder mixture into evacuated Cu tubular containers, i.e., cans, and apply gradual direct consolidation via rotary swaging at elevated temperatures, as well as at room temperature (final passes) to find the most convenient way to produce the designed Al2O3 particle-strengthened Cu composite. The composites swaged with the total swaging degree of 1.83 to consolidated rods with a diameter of 10 mm were subjected to measurements of electroconductivity, investigations of mechanical behavior via compression testing, and detailed microstructure observations. The results revealed that the applied swaging degree was sufficient to fully consolidate the canned powders, even at moderate and ambient temperatures. In other words, the final structures, featuring ultra-fine grains, did not exhibit voids or remnants of unconsolidated powder particles. The swaged composites featured favorable plasticity regardless of the selected processing route. The flow stress curves exhibited the establishment of steady states with increasing strain, regardless of the applied strain rate. The electroconductivity of the composite swaged at elevated temperatures, featuring homogeneous distribution of strengthening oxide particles and the average grain size of 1.8 µm2, reaching 80% IACS (International Annealed Copper Standard).

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The Microstructure and Conductivity of Copper–Aluminum Composites Prepared by Rotary Swaging

Cited by 4 publications

References 13 publications

Structural Phenomena Introduced by Rotary Swaging: A Review

Structural Phenomena Introduced by Rotary Swaging: A Review

Influence of Imposed Strain on Weldability of Dievar Alloy

Influence of Structure Development on Performance of Copper Composites Processed via Intensive Plastic Deformation

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