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Modified Al-Si-Mg 계 조조용 합금의 ECO-Mg 함량 변화에 따른 인장 및 피로 변형 거동
함기수(G.S. Ham),백상우(S.W. Baek),김민종(M.J. Kim),김세광(S.K. Kim),윤영옥(Y.O. Yoon),조규상(K.S. Cho),이기안(K.A. Lee) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
The effect of ECO-Mg addition on the microstructure, tensile and fatigue deformation behaviors of modified Al-Si-Mg casting alloy was investigated. Four different alloys having various amounts of ECO-Mg (0.3, 0.4, 1.0 and 1.5 wt.%) were prepared though sand casting process. OM microscopy, Scanning Electron Microscope (SEM), Energy Dispersive Spectrometer (EDS) and X-ray Diffraction (XRD) analyses was examined as well as hardness, tensile, and fatigue tests. Modified aluminum alloy consisted of α-Aluminum (dendrite shape), eutectic Si, Mg₂Si and Fe-intermetallic phases. It was found that DAS(Dendrite Ann Spacing) gradually decreased and eutectic Si, Fe-intermetallic phases were more finely distributed in the matrix with increasing the amount of ECO-Mg. Tensile and fatigue properties were also improved with increasing ECO-Mg content. The micro-mechanisms of tensile and fatigue deformations of the alloy were also discussed based on the fractography observation results.
산전 유전 검사로 진단된 3회 연속적인 모계 기원의 가족성 partial trisomy 4p와 4/22 전좌 이상(translocation) 예
양영호,김경수,김세광,김인규,민혜원,송찬호,Yang, Y.H.,Kim, G.S.,Kim, S.K.,Kim, I.K.,Min, H.W.,Song, C.H. 대한생식의학회 1994 Clinical and Experimental Reproductive Medicine Vol.21 No.1
A 27-year-old pregnant woman who had one son with mental and growh retardation and dysmorphic features, was referred for genetic counselling. Cytogenetic investigations revealed 4/22 translocation in the mother(46, XX, t(4;22)(p14;P11)), partial trisomy 4p in son(46, XY, -22, +der(22), t(4;22)(p14;p11)mat). The father had normal karyotype. Amniocentesis and chorionic villi sampling were performed in 3 successive pregnancies. The karyotypes of fetus in 3rd, 4th pregnancies by amniocentesis were 46, XX, t(4;22)(p14;p11) and 46, XX, t(4;22) (p14;p11), and the karyotype of fetus in 5th pregnancy by chorionic villi sampling was found to be 46, XX, -22, +der(22) t(4;22)(p14;p11)mat. We report 3 succesive prenatally diagnosed familial partial trisomy 4p and 4/22 translocation of maternal origin with review of literature.
D. I. Jang(장동인),S. K. Kim(김세광) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
The aim of this study was to improve extrudability limit, eliminate welding line and obtain optimum thixoextrusion conditions for manufacturing tubes of 7075 Al wrought alloy. By thixoextrusion, it was possible to improve deformability, control isotropy with extrusion direction, eliminate welding line (seamless) and save cost due to low energy consumption compared with conventional extrusion processes. The welded part was not observed at the welding line area. The grains of thixoextruded trbe were homogeneously distributed and equiaxed grains were observed. Therefore, thixoextrusion is the most effective variable for the control of the magnitude of the welding line.
Modified 2024 알루미늄 합금의 인장 및 피로 연구
김관영(G. Y. Kim),김선호(S. H. Kim),윤영옥(Y. O. Yoon),김세광(S. K. Kim),조규상(K. S. Cho),이기안(K. A. Lee) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
In this study, the microstructures and mechanical properties of the recently developed Eco-2024-T3 alloy were examined. Eco2024 is made using Eco-Mg(Mg-Al₂Ca)in place of element Mg during the manufacture of alloy 2024-T3. This is an alloy that has economic advantage and excellent properties. Alloy Eco2024 showed smaller crystal grains that were distributed more evenly compared to the existing alloy 2024-T3. It consisted of Al matrices containing minute amounts of Al₂CuMg, Al₂Cu and Ca phases and showed microstructures with reduced amounts of Fe phases or oxide. As a result of tensile test, this alloy exhibited yield strength of 413MPA, tensile strength 527㎫, and elongation of 15.4%. In other words, it showed higher strength than the existing alloy 2024 but was similar to the existing alloy 2024 in terms of elongation. In fatigue tests, alloy Eco2024-T3 recorded fatigue limit of 330 ㎫ around 80% of its yield strength this is a much more excellent property compared to the existing alloy 2024-T3, which has fatigue limit of 250㎫. Based on the aforementioned results, the correlation between the excellent mechanical properties of alloy Eco2024-T3 and its microstructure was examined.