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http://dx.doi.org/10.5228/KSPP.2008.17.1.046

Microscopic Investigation of the Strain Rate Hardening for Polycrystalline Metals  

Yoon, J.H. (한국과학기술원 기계항공시스템학부)
Park, C.G. (포항공과대학교 신소재공학과)
Kang, J.S. (포항공과대학교 신소재공학과)
Suh, J.H. (포항공과대학교 신소재공학과)
Huh, M.Y. (고려대학교 신소재공학부)
Kang, H.G. (고려대학교 신소재공학부)
Huh, H. (한국과학기술원 기계공학과)
Publication Information
Transactions of Materials Processing / v.17, no.1, 2008 , pp. 46-51 More about this Journal
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 the rage of $10^{-2}$ to $10^2/sec$ strain rate. In this paper, tensile tests for various strain rates are performed in the rage of $10^{-2}$ to $10^2/sec$ then, specimens are extracted on the same strain position to investigate the microscopic behavior of deformed materials. The extracted specimens are investigated by using the electron backscattered diffraction(EBSD) and transmission electron microscopy(TEM) results which show the effect of texture orientation, grain size and dislocation behavior on the strain rate hardening.
Keywords
Plastic Deformation; Strain Rte Hardening; Dislocation Density; Tensile Test; Electron Backscattered Diffraction(EBSD); Transmission Electron Microscopy(TEM); Dislocation Behavior;
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