Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Cr Contents on Precipitation Process of Cu-Cr Alloys

크롬동합금의 시효석출거동에 미치는 Cr 첨가량의 영향

  • Koo, B.H. (School of Nano & Advanced Materials Engineering, Changwon National University, Korea Institute of Machinery & Materials) ;
  • Chon, G.B. (School of Nano & Advanced Materials Engineering, Changwon National University, Korea Institute of Machinery & Materials) ;
  • Lee, C.G. (School of Nano & Advanced Materials Engineering, Changwon National University, Korea Institute of Machinery & Materials) ;
  • Kim, C.J. (School of Nano & Advanced Materials Engineering, Changwon National University, Korea Institute of Machinery & Materials)
  • 구본흔 (창원대학교 공과대학 나노.신소재공학부, 한국기계연구원 재료기술연구소 비철재료그룹) ;
  • 전검배 (창원대학교 공과대학 나노.신소재공학부, 한국기계연구원 재료기술연구소 비철재료그룹) ;
  • 이찬규 (창원대학교 공과대학 나노.신소재공학부, 한국기계연구원 재료기술연구소 비철재료그룹) ;
  • 김창주 (창원대학교 공과대학 나노.신소재공학부, 한국기계연구원 재료기술연구소 비철재료그룹)
  • Received : 2005.09.02
  • Accepted : 2005.09.28
  • Published : 2005.09.30
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Abstract

Effect of Cr contents(Cr: 0.27, 0.45 and 0.65wt.%) on precipitation process has been studied by electrical resistivity measurements, hardness and scanning electron microscope. The first stage of the process consists of the formation of Cr-rich particles, the second stage consists of the competitive growth of these particles. The kinetics of precipitation could be described by Johnson-Mehl-Avrami equation, $f(t)=1-\exp(-kt^n)$. The values of n were found to be in the range from 0.17 to 0.39 at the first stage and from 1.0 to 1.5 at the second stage. The activation energies of Cu-Cr alloys were determined by Cross-Cut method and were 90~136 kJ/mol. The maximum hardness value of $H_RB$ 84 was obtained in Cu-0.65wt.%Cr alloy.

Keywords

Acknowledgement

Supported by : 창원대학교

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