Influence of Heat Treatment on the Structure and Properties of an Al–7% REM Conductive Aluminum Alloy Casted in an Electromagnetic Crystallizer

Короткова, Н. О.; Белов, Н. А.; Тимофеев, В. Н.; Motkov, M. M.; Cherkasov, S. O.

doi:10.1134/s0031918x2002009x

Cited by 17 publications

(10 citation statements)

References 11 publications

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“…For the production of high-quality cast billets with a small cross-section, the continuous casting method using EMM has been increasingly used. At the same time, due to high cooling rates and the absence of metal contact with the walls of the mold, it is possible to obtain billets of small diameters (5-18 mm) with a fine-grained structure and increased plastic properties [6,[11][12][13][14][51][52][53][54][55]. The ingot obtained in the EMM has a dendritic parameter 100 times less than when casting into a slip mold and is comparable to the structure of granules (Table 1).…”

Section: Materials and Methods Of Carrying Out Researchmentioning

confidence: 99%

“…At the same time, recently, in order to obtain longish semi-finished products from aluminum alloys technologies have been developed for continuous casting of ingots of small cross-section into an electromagnetic mold (EMM) and their subsequent deformation on installations for continuous extrusion Conform [61,62] or combined rolling-extruding (CRE) [60,[63][64][65] and drawing [4,[22][23][24][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65]. The use of such technologies can lead to the solution of these issues and the production of small-diameter wire with the required set of operational properties.…”

Section: Introductionmentioning

confidence: 99%

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Investigation structure and properties of wire from the alloy of AL-REM system obtained with the application of casting in the electromagnetic mold, combined rolling-extruding, and drawing

Sidelnikov

Voroshilov

Motkov

et al. 2021

Int J Adv Manuf Technol

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The paper presents the results of studies of the structure and properties of a wire with a diameter of 0.5 mm from an alloy of the Al-REM system with a rare-earth metal content of 7-9%. Wire obtained as a result of the implementation of the technology of its manufacture using the methods of casting into an electromagnetic mold (EMM), continuous extruding and drawing.The rheological properties of the metal of continuously cast round billets from the experimental alloy obtained using an electromagnetic mold are determined. The modeling and analytical assessment of the possibility of carrying out the process of combined rolling-extruding (CRE) of such billets in a closed boxtype roll groove of a continuous extruding unit are carried out. The features of metal shaping have been studied. The temperature-speed and technological parameters was found at which the CRE process can be carried out in a stable mode of operation. Data have been obtained for the forces acting on the die and rolls and the moments on the rolls during rolling-extruding.The results of experimental studies of the process of obtaining longish deformed semi-finished products from an experimental alloy on the laboratory unit CRE-200 and the pilot plant unit CRE-400 are presented. The structure of the metal has been studied; data on the ultimate tensile strength, yield strength, relative elongation, and electrical resistivity of hot-extruded rods and wires in cold-worked and annealed states have been obtained.It was found that the proposed processing modes make it possible to obtain by the method of combined rolling-extruding rods with a diameter of 9 mm in industrial conditions from longish billets with a diameter of 18 mm, cast by means of EMM. Wire in a cold-worked and annealed state with a diameter of 0.5 obtained by drawing from the rods with a diameter of 9 mm from an experimental alloy of the Al-REM system containing 7-9 rare earth metals with the required physical and mechanical properties.

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Section: Materials and Methods Of Carrying Out Researchmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation structure and properties of wire from the alloy of AL-REM system obtained with the application of casting in the electromagnetic mold, combined rolling-extruding, and drawing

Sidelnikov

Voroshilov

Motkov

et al. 2021

Int J Adv Manuf Technol

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“…Eutectic aluminum alloys with a high content of rare earth elements (REEs) and commercial conductor Al-Mg-Si alloys are often used to produce wires [1,2,5,6]. Thermal stability of such commercial Al-REEs alloys and conventional Al-Mg-Si alloys is insufficient, therefore, many research teams are now actively engaged in designing novel heat-resistant high-strength conductor aluminum Al-REEs alloys [6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Sc, Hf, and Yb Additions on Superplasticity of a Fine-grained Al-0.4%Zr Alloy

Нохрин¹,

Gryaznov²,

Shotin³

et al. 2022

Preprint

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The research was undertaken to study the way deformation behaves in ultrafine-grained (UFG) conducting Al-Zr alloys doped with Sc, Hf, and Yb. All in all, 8 alloys were studied with zirconium partially replaced by Sc, Hf, and/or Yb. Doping elements (X = Zr, Sc, Hf, Yb) in the alloys total 0.4 wt.%. The choice of doping elements is conditioned by possible precipitation of Al3X particles with L12 structure while annealing these alloys. Such particles provide higher thermal stability of a nonequilibrium UFG microstructure. Initial coarse-grained samples were obtained by induction casting. The UFG microstructure in the alloys was formed by Equal Channel Angular Pressing (ECAP) at 225°C. Superplasticity tests were carried out at temperatures ranging from 300 to 500 °C and strain rates varying between 3.310-4 and 3.310-1 s-1. The highest values of elongation to failure are observed in Sc-doped alloys. A UFG Al-0.2%Zr-0.1%Sc-0.1%Hf alloy has maximum ductility: at 450 °C and a strain rate of 3.310-3 s-1, relative elongation to failure reaches 765%. At the onset of superplasticity, stress–strain curves are characterized by a stage of homogeneous strain and a long stage of localized plastic flow. The dependence of homogeneous strain (eq) on test temperature in UFG Sc-doped alloys is increasing uniformly, which is not the case for other UFG alloys with eq(T) dependence peaking at 350-400 оС. Strain rate sensitivity coefficient of flow stress m is small and does not exceed 0.26-0.3 at 400-500 °C. In UFG alloys containing no scandium, m coefficient is observed to go down to 0.12-0.18 at 500 оС. It has been suggested that lower m values are driven by intensive grain growth and pore formation in large Al3X particles, which develop specifically at the ingot crystallization stage.

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“…with Cu or Ag coatings. Complex Al-Ce-La-Fe Russian industrial alloy 01,417 is an example of such materials [ 4 ] as well as a number of novel conductor alloys that are doped with rare earth elements (REE) [ 6 , 7 , 8 , 9 , 10 , 11 , 12 ]. The 01,417 alloy has the minimal ultimate strength of 160 MPa, relative elongation to failure 8%, and specific electrical resistivity (SER) of 3.2 μΩ·cm [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Thermal Stability of Microstructure and Mechanical Properties of Bimetallic Fine-Grained Wires from Al–0.25%Zr–(Sc,Hf) Alloys

et al. 2021

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Thermal stability of composite bimetallic wires from five novel microalloyed aluminum alloys with different contents of alloying elements (Zr, Sc, and Hf) is investigated. The alloy workpieces were obtained by induction-casting in a vacuum, preliminary severe plastic deformation, and annealing providing the formation of a uniform microstructure and the nucleation of stabilizing intermetallide Al3(Zr,Sc,Hf) nanoparticles. The wires of 0.26 mm in diameter were obtained by simultaneous deformation of the Al alloy with Cu shell. The bimetallic wires demonstrated high strength and improved thermal stability. After annealing at 450–500 °C, a uniform fine-grained microstructure formed in the wire (the mean grain sizes in the annealed Al wires are 3–5 μm). An increased hardness and strength due to nucleation of the Al3(Sc,Hf) particles was observed. A diffusion of Cu from the shell into the surface layers of the Al wire was observed when heating up to 400–450 °C. The Cu diffusion depth into the annealed Al wire surfaces reached 30–40 μm. The maximum elongation to failure of the wires (20–30%) was achieved after annealing at 350 °C. The maximum values of microhardness (Hv = 500–520 MPa) and of ultimate strength (σb = 195–235 MPa) after annealing at 500 °C were observed for the wires made from the Al alloys alloyed with 0.05–0.1% Sc.

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Influence of Heat Treatment on the Structure and Properties of an Al–7% REM Conductive Aluminum Alloy Casted in an Electromagnetic Crystallizer

Cited by 17 publications

References 11 publications

Investigation structure and properties of wire from the alloy of AL-REM system obtained with the application of casting in the electromagnetic mold, combined rolling-extruding, and drawing

Investigation structure and properties of wire from the alloy of AL-REM system obtained with the application of casting in the electromagnetic mold, combined rolling-extruding, and drawing

Effect of Sc, Hf, and Yb Additions on Superplasticity of a Fine-grained Al-0.4%Zr Alloy

Investigation of Thermal Stability of Microstructure and Mechanical Properties of Bimetallic Fine-Grained Wires from Al–0.25%Zr–(Sc,Hf) Alloys

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