| Abstract |
| Commercial AA1070 alloy for electrical wire is severely deformed by the drawing process when a rod with a diameter of 2 mm is greatly reduced to 0.4 mm by multi-pass. Changes in the microstructure, mechanical properties, and electrical properties of the Al alloy during the wire-drawing process were investigated in detail. The as-drawn Al wires showed a deformation structure in which the grains are greatly elongated in the drawing direction, even though recovery and/or partial recrystallization occurred more actively in the specimens which had more than 84% in reduction of cross-sectional area (RA). In addition, the fraction of high angle grain boundaries tended to increase with the increase of RA. For all drawn specimens, the fiber texture of the {110}<111> and {112}<111> components was mainly developed, and their maximum intensity tended to increase with increasing RA. Recrystallization texture of (001)[100] and (110)[001] began to appear at an RA higher than 84%. The hardness tended to increase with increasing RA due to work hardening. In particular, increasing RA to 84% resulted in a great rise in hardness, accompanied by a distinct non-uniformity in hardness in the thickness direction. However, the average hardness hardly changed at RA above 84%, even when RA was increased to 96%. The strength also tended to increase stepwise as RA increased, very similar to the change in hardness. The specimen with an RA of 93% showed the highest tensile strength of 192 MPa, 2.8 times higher than that of the specimen before drawing. The electric conductivity did not decrease significantly, even with extreme increases in RA, and remained at an average value of 61.6 %IACS.
(Received 27 July, 2023; Accepted 8 September, 2023) |
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| Key Words |
| AA1070 alloy, wire drawing, microstructure, mechanical properties, electrical properties |
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