Proceedings of the Korean Society for Technology of Plasticity Conference (한국소성가공학회:학술대회논문집)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Microscopic Investigation of the Strain Rate Hardening for Metals

금속재료 변형률속도 경화의 미시적 관찰

  • 윤종헌 (한국과학기술원 기계공학과) ;
  • 허훈 (한국과학기술원 기계공학과) ;
  • 허무영 (고려대학교 신소재공학부) ;
  • 강형구 (고려대학교 신소재공학부) ;
  • 박찬경 (포항공과대학교 신소재공학과) ;
  • 서주형 (포항공과대학교 신소재공학과) ;
  • 강주석 (포항공과대학교 신소재공학과)
  • Published : 2007.10.11
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Abstract

Polycrystalline materials such as steels(BCC) and aluminum alloys(FCC) show the strain hardening and the strain rate hardening during the plastic deformation. The strain hardening is induced by deformation resistance of dislocation glide on some crystallographic systems and increase of the dislocation density on grain boundaries or inner grain. However, the phenomenon of the strain rate hardening is not demonstrated distinctly. In this paper, tensile tests for various strain rates are performed in the rage of $10^{-2}$ to $10^2s^{-1}$ then, specimens are extracted on the same strain position to investigate the microscopic behavior of deformed materials. The extracted specimen is investigated by using the electron backscattered diffraction(EBSD) and transmission electron microscopy(TEM) results which contain grain size, grain shape, aspect ratio and dislocation substructure.

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