Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effects of Alloying Elements on the Tensile Strength and Electrical Conductivity of Cu-Fe-P Based Alloys

Cu-Fe-P계 합금의 강도 및 전기전도도에 미치는 첨가 원소의 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

In this study, the effect of Sn and Mg on microstructure and mechanical properties of Cu-Fe-P alloy were investigated by using scanning electron microscope, transmission electron microscope, tensile strength, electrical conductivity, thermal softening, size and distribution of the precipitation phases in order to satisfy characteristic for lead frame material. It was observed that Cu-0.14wt%Fe-0.03wt%P-0.05wt%Si-0.1wt%Zn with Sn and Mg indicates increasing tensile strength compare with PMC90 since Sn restrained the growth of the Fe-P precipitation phase on the matrix. However, the electrical conductivity was decreased by adding addition of Sn and Mg because Sn was dispersed on the matrix and restrained the growth of the Fe-P precipitation. The size of 100 nm $Mg_3P_2$ precipitation phase was observed having lattice parameter $a:12.01{\AA}$ such that [111] zone axis. According to the results of the study, the tensile strength and the electrical conductivity satisfied the requirements of lead frame; so, there is the possibility of application as a substitution material for lead frame of Cu alloy.

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