Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Evolution of Microstructure in Al-4.0%Zn-1.5%Mg-0.9%Cu Alloy by Extrusion, Rolling and Heat Treatment

Al-4.0%Zn-1.5%Mg-0.9%Cu 합금의 압출, 압연 및 열처리에 따른 미세조직 변화

  • Kwon, Hyeok Gon (School of Advanced Materials Science and Engineering, Kumoh National Institute of Technology (KIT)) ;
  • Park, Jong Moon (School of Advanced Materials Science and Engineering, Kumoh National Institute of Technology (KIT)) ;
  • Oh, Myung Hoon (School of Advanced Materials Science and Engineering, Kumoh National Institute of Technology (KIT)) ;
  • Park, No Jin (School of Advanced Materials Science and Engineering, Kumoh National Institute of Technology (KIT))
  • 권혁곤 (금오공과대학교 신소재공학부) ;
  • 박종문 (금오공과대학교 신소재공학부) ;
  • 오명훈 (금오공과대학교 신소재공학부) ;
  • 박노진 (금오공과대학교 신소재공학부)
  • Received : 2018.01.19
  • Accepted : 2018.02.02
  • Published : 2018.03.30
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Abstract

In this study, microstructural changes due to extrusion, rolling and heat treatment were studied to fabricate Al-4.0wt%Zn-1.5wt%Mg-0.9wt%Cu alloys with homogeneous microstructure suitable for metal cases of smart phones and electronic products fabricated through plastic working. After extrusion microstructure and texture were developed very differently on the surface and inside. Inside, coarse grains were formed and a strong Cube component orientation was developed. On the surface, a weak texture was developed with small grains. After 72% cold rolling the intensity of the Cube component orientation was lower, and uniform texture was developed in all the layers and the R-value was uniformly predicted. After recrystallization, the grain size difference between at the surface and the inside is smaller, when 72% rolling was performed, indicating that a uniform structure is formed. Texture develops almost randomly after recrystallization and exhibits uniform R-values at all layers.

Keywords

References

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