Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Two-step Solution Treatment for Enhancement of Mechanical Properties of AlSiCu Aluminum Alloy

Al6Si2Cu 알루미늄 합금의 기계적 물성 향상을 위한 이단계 고용화 열처리

  • Park, Sang-Gyu (Department of Advanced material and Engineering, Chosun University) ;
  • Kim, Chung-Seok (Department of Materials Science and Engineering, Chosun University)
  • 박상규 (조선대학교 첨단소재공학과) ;
  • 김정석 (조선대학교 재료공학과)
  • Received : 2018.04.03
  • Accepted : 2018.04.13
  • Published : 2018.05.30
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Abstract

The objective of this study is to develop the mechanical properties of AlSiCu aluminum alloy by the two-step solution heat treatment. The microstructure of gravity casting specimen represents a typical dendrite structure having a secondary dendrite arm spacing (SDAS) of 40 mm. In addition to the Al matrix, a large amount of coarsen eutectic Si phase, $Al_2Cu$ intermetallic phase, and Fe-rich phases are generated. The eutectic Si phases are fragmented and globularized with solution heat treatment. Also, the $Al_2Cu$ intermetallic phase is resolutionized into the Al matrix. The $2^{nd}$ solution temperature at $525^{\circ}C$ might be a optimum condition for enhancement of mechanical properties of AlSiCu aluminum alloy.

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References

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