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인발공정에 의해 강소성 가공된 AA1070선재의 미세조직 및 기계적 특성

Microstructure and Mechanical Properties of an AA1070 Wire Severely Deformed by Drawing Process

  • 정대한 (국립목포대학교 신소재공학과) ;
  • 이성희 (국립목포대학교 신소재공학과)
  • Jeong, Dae-Han (Department of Advanced Materials Science and Engineering, Mokpo National University) ;
  • Lee, Seong-Hee (Department of Advanced Materials Science and Engineering, Mokpo National University)
  • 투고 : 2020.04.29
  • 심사 : 2020.05.25
  • 발행 : 2020.06.27

초록

A commercial AA1070 alloy for electrical wire is severely deformed by drawing process in which a rod with an initial diameter of 9mm into is reduced to a wire of 2mm diameter. The drawn AA1070 wire is then annealed at various temperatures from 200 to 450 ℃ for 2h. Changes in microstructure, mechanical properties and electrical properties of the specimens with annealing temperature are investigated in detail. The specimen begins partially to recrystallize at 250 ℃; above 300 ℃ it is covered with equiaxed recrystallized grains over all regions. Fiber textures of {110}<111> and {112}<111> components are mainly developed, and {110}<001> texture is partially developed as well. The tensile strength tends to decrease with annealing temperature due to the occurrence of recovery or/and recrystallization. On the other hand, the elongation of the annealed wire increases with the annealing temperature, and reaches a maximum value of 33.3 % at 300 ℃. Electric conductivity of the specimens increases with annealing temperature, and reaches a maximum value of 62.6 %IACS after annealing at 450 ℃. These results are discussed in comparison with those for the other aluminum alloy.

키워드

참고문헌

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