Changes in Microstructure, Mechanical Properties, and Electrical Conductivity of Severely Drawn AA1070 Wire with Annealing

• Published in: 대한금속·재료학회지, 62(10) pp. 749 - 756
• Main Authors: 조상현, 이성희
• Format: Journal Article
• Language: Korean
• Published: 대한금속·재료학회 01.10.2024
• Subjects: 재료공학
• ISSN: 1738-8228; 2288-8241

The drawing process severely deforms commercial AA1070 alloy for electrical wire, reducing a rodfrom a diameter of 2.0 mm to 0.4 mm, followed by annealing. The annealing process was conducted at varioustemperatures ranging from 200oC to 450oC, with each temperature maintained for 1hour. The effects ofincreasing annealing temperature on the microstructure, mechanical properties, and electrical properties ofthe Al wire were investigated in detail. The drawn Al wire showed a severely deformed microstructure andfiber texture that {110} and {112} components strongly developed. As the annealing temperatureincreased, the deformation structure changed into recrystallization structure over all regions. However, thefiber texture still strongly remained even in the specimens annealed at higher temperatures. The hardnessdecreased with increasing annealing temperature due to the occurrence of recovery and/or recrystallization. The strength also continued to decrease as the annealing temperature increased. However, elongationgradually increased with increase of annealing temperature to 250oC; above 275oC, it increased particularlysharply. The electric conductivity tended to increase slightly with increasing annealing temperature, reachinga maximum value of 62.2%IACS at 300oC. Changes in microstructure, mechanical properties and electricalconductivity with annealing of commercially drawn AA1070 were compared with those of the previous study. KCI Citation Count: 0