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초미세 결정립 Cu-3% Ag 합금의 기계적 물성과 전기 전도도
고영건(Y.G. Ko),이철원(C.W. Lee),남궁승(S. Namgung),신동혁(D.H. Shin) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
The paper deals with the mechanical and electrical responses of submicrocrystalline Cu-3% Ag alloy as a function of strain imposed by equal-channel angular pressing. When inducing the effective strain of 12, the initial grain size of~50 μm is evidently reduced within the range of 0.2-0.3 μm in size, having a reasonably equiaxed shape. The results of tension tests at room temperature exhibit that the tensile strength of the present alloy increases with increasing the amount of strain whereas losing electrical conductivity slightly. This phenomenon can be explained based on fine grained structure together with the non-equilibrium state of grain boundaries.
고영건(Y. G. Ko),이강민(K. M. Lee),이철원(C. W. Lee),금동훈(D. H. Kum),신동혁(D. H. Shin) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
The present work deals with microstructure and tensile deformation of nanostructured dual-phase steel consisting of ferrite and martensite phases. Prior to deformation, a fully martensite phase is prepared and then processed by equal channel angular pressing (ECAP) and subsequent annealing. Room-temperature tensile properties are examined and compared to those of dual-phase steels with coarse grains. Due to the combined effects coming from the grain refinement of both phases and their uniform distributions, the nanostructured dual-phase steel exhibits better strength and ductility than coarse grained counterpart, achieving ~1 GPa and ~20% for tensile strength and elongation, respectively.