Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effects of Added Cr Element on the Tensile Strength and Electrical Conductivity of Cu-Fe Based Alloys

Cu-Fe계 합금의 강도 및 전기전도도에 미치는 Cr 원소첨가의 영향

  • Kim, Dae-Hyun (School of Material Science & Engineering, Ulsan University) ;
  • Lee, Kwang-Hak (School of Material Science & Engineering, Ulsan University)
  • 김대현 (울산대학교 첨단소재공학부) ;
  • 이광학 (울산대학교 첨단소재공학부)
  • Published : 2010.02.27
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Abstract

This study looked at high performance copper-based alloys as LED lead frame materials with higher electrical-conductivity and the maintenance of superior tensile strength. This study investigated the effects on the tensile strength, electrical conductivity, thermal softening, size and distribution of the precipitation phases when Cr was added in Cu-Fe alloy in order to satisfy characteristics for LED Lead Frame material. Strips of the alloys were produced by casting and then properly treated to achieve a thickness of 0.25 mm by hot-rolling, scalping, and cold-rolling; mechanical properties such as tensile strength, hardness and electrical-conductivity were determined and compared. To determine precipitates in alloy that affect hardness and electrical-conductivity, electron microscope testing was also performed. Cr showed the effect of precipitation hardened with a $Cr_3Si$ precipitation phase. As a result of this experiment, appropriate aging temperature and time have been determined and we have developed a copper-based alloy with high tensile strength and electrical-conductivity. This alloy has the possibility for use as a substitution material for the LED Lead Frame of Cu alloy.

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References

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