Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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The Optimal Solution Treatment Condition in a Al-Si-Cu AC2B Alloy

Al-Si-Cu계 AC2B 합금의 최적 용체화 처리 조건

  • Jung, Jae-Gil (Department of Materials Science and Engineering, Yonsei University) ;
  • Park, June-Soo (Department of Materials Science and Engineering, Yonsei University) ;
  • Ha, Yang-Soo (Department of Materials Science and Engineering, Yonsei University) ;
  • Lee, Young-Kook (Department of Materials Science and Engineering, Yonsei University) ;
  • Jun, Joong-Hwan (Production Technology R&D Division, Korea Institute of Industrial Technology) ;
  • Kang, Hee-Sam (Research & Development Division, Hyundai-Kia Motors) ;
  • Lim, Jong-Dae (Research & Development Division, Hyundai-Kia Motors)
  • 정재길 (연세대학교 공과대학 신소재공학과) ;
  • 박준수 (연세대학교 공과대학 신소재공학과) ;
  • 하양수 (연세대학교 공과대학 신소재공학과) ;
  • 이영국 (연세대학교 공과대학 신소재공학과) ;
  • 전중환 (한국생산기술연구원 생산기반기술연구본부) ;
  • 강희삼 (현대기아자동차 연구개발총괄본부) ;
  • 임종대 (현대기아자동차 연구개발총괄본부)
  • Received : 2009.03.06
  • Published : 2009.04.25
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Abstract

The precipitates, hardness, and tensile properties of Al-6.2Si-2.9Cu AC2B alloy were investigated with respect to solution treatment time at $500^{\circ}C$. $Al(Cu)-Al_2Cu$ eutectic, Si, ${\theta}-(Al_2Cu)$, and $Q-(Al_5Cu_2Mg_8Si_6)$ phases were observed in the as-cast specimen. With increasing the solution treatment time at $500^{\circ}C$, the $Al(Cu)-Al_2Cu$ eutectic and ${\theta}-(Al_2Cu)$ phases were gradually reduced and finally almost disappeared in 5 h. The mechanical properties, such as hardness, tensile strength, and elongation, were improved with solution treatment time until about 5 h due to the dissolution of the $Al_2Cu$ particles. With further holding time, the mechanical properties did not change much. The solution treated specimens for over 5 h at $500^{\circ}C$ exhibit almost the same tensile properties even after aging at $250^{\circ}C$ for 3.5 h. Accordingly, the optimal solution treatment condition of the Al-Si-Cu AC2B alloy is considered to be 5 h at $500^{\circ}C$.

Keywords

Acknowledgement

Grant : 가솔린 헤드의 열처리 최적화

Supported by : NGV

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