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

Abstract

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.

Effect of Radial-Shear Rolling on the Structure and Hardening of an Al–8%Zn–3.3%Mg–0.8%Ca–1.1%Fe Alloy Manufactured by Electromagnetic Casting

“…ElmaCast technology provides cast billet cooling rates comparable to those of RS/PM technology (over 1000 K/s for billet diameters up to 14 mm). It was also successfully tested in industrial conditions for experimental aluminum alloys, in particular with additives of rare earth metals [ 14 , 15 ], namely iron, calcium, and zirconium [ 16 , 17 ]. This suggests that the application of the EMC method to high-strength wrought aluminum alloys based on the Al–Zn–Mg system with a high Fe content is promising.…”

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

“…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].…”

Effect of Er, Si, Hf, Nb Additives on the Thermal Stability of Microstructure, Electrical Resistivity and Microhardness of Fine-Grained Aluminum Alloys Al-0.25%Zr

“…One of approaches to the development of novel conductor aluminum alloys is their doping with the elements, which affect the electrical conductivity weakly but affect their strength positively. In Russia, highly doped eutectic alloy 01417 has been developed, the fine copper-clad aluminum wires from which are applied extensively in cable industry at present [17][18][19][20]. For example, industrial alloys 01417 have the minimal ultimate strength 160 MPa, relative elongation 8%, and specific electrical resistivity (SER) 3.2 •cm [17].…”