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고분해능 전자현미경 및 화상처리법에 의한 단범위 산만산란의 해석
이갑호 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.7
The combined use of high resolution transmission electron microscopy and the image processing are applied to determine the atomic-scale structure of the short-range order diffuse scattering, Microdomain was not detected in quenched Ni₄Mo alloy which showed the diffuse scattering at {11/20} positions. The lattice modulation observed in this alloy seems to be attributed to the concentration waves appeared parallel to the {210} planes. In quenched Cu₃Pt alloy which showed the diffuse scatterings with twofold and fourfold splittings of intensity maxima, the L1₂- type microdomains were recognized. This microdomains were believed to have out-of-step relation between neighbors.
李甲鎬,張成豪,金大永 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.5
The precipitation of carbide in tempered high tensile strength steel has been characterized by using high resolution electron microscopy and the combined use of a computer-aided image processing system. The lath-like η-Fe_2C carbide precipitated along <211>_M directions with 8-11 ㎚ in width are observed in the martensite plate. The orientation relationship between the η-Fe_2C carbide and the martensite matrix was determined to be (010)_η (110)_M, [101]_η [111]_M. The twin structure having {211} habit plane is occasionally observed in the martensite matrix, and the carbides were not preferentially precipitated at twin boundaries, in contrast with the observation of other investigators.
급속응고 분말법으로 제조한 Al-Zn-Mg-Zr-Mn-Cu합금의 시효특성
이갑호 한국분말야금학회 1997 한국분말재료학회지 (KPMI) Vol.4 No.2
In this study the changes of the hardness and microstructures during aging at 120$^{\cire}C$ of an RS-P/M Al-5.6wt%Zn-2.0wt%Mg-1.3wt%Zr-1.0wt%Mn-0.25wt%Cu alloy were studied using a transmission electron microscopy. The hardness increased rapidly at early stage of aging and reached the maximun when the specimen was aged for 24 hr. The many irregular-shaped $Al_4Mn$ and rod-shaped $Al_6Mn$ dispersoids with 0.1-0.4 $\mu$m in length were observed in the as-extruded alloy. The dark particles with 2-3 nm in size were observed in aged specimen for 5hr and those are thought to be G.P.zones or precursor of $\eta'$ precipitates. In aged specimen for 24 hr, the $\eta'$ phases were distributed homogeneously within the matrix and the PFZ with 30-40 nm in width was observed along the grain boundary. With further aging, the width of PFZ increased and $\eta$ phases were also detected within the matrix.
등통로각압축공정으로 가공된 Cu-Ag 나노복합재 내의 변형쌍정
이갑호 ( Kap Ho Lee ),홍순익 ( Sun Ig Hong ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.8
The nanostructure of a Cu-15wt%Ag composite processed by Equal Channel Angular Pressing (ECAP) was observed by transmission electron microscopy (TEM). ECAP was found to greatly improve the yield strength while maintaining good electrical conductivity. The nanostructured Cu-15 wt%Ag composite contained a high density of {111}/<112> nanotwins and the migration of the twin boundary and detwinning process of those nanotwins was also observed. Nanotwins can be nucleated by bowing out of twinning dislocations at the Cu/Ag interface and propagated by the sequential emission of twinning dislocations on every adjacent twinning plane. Steps having the height of one or three atomic layers on the {111} plane were observed on the coherent twin boundary (CTB). The stair rod dislocation was formed by a cross-slip of 30° partial at one layer high step on the twin boundary, while a cross-slip of 90° partial transformed the incident dissociated dislocation into dissociated dislocation in the twin plane without leaving a stair-rod dislocation behind. The three layer high step was formed by migration of the (111) twin boundary in the direction normal to the twin plane, and it produced a {112} incoherent twin boundary (ITB). The advance or retreat of {112} ITB can lead to the extension or retraction of (111) on the CTB. The detwinning process involves the collective glide of a group of three Shockley partial with different Burgers vectors and the dynamical overlap of stacking faults (SFs) of intrinsically and/or extrinsically dissociated dislocations. †(Received January 7, 2013)