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AT42 Mg 합금의 크리프 특성에 미치는 Sr의 영향
최종민 ( Jong Min Choi ),김대한 ( Dae Han Kim ),조대현 ( Dae Hyun Cho ),최윤석 ( Yoon Suk Choi ),박익민 ( Ik Min Park ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.5
Creep rupture properties and microstructures of an as-cast Mg-4Al-2Sn alloy with and without Sr contents (1 wt% and 2 wt%) were investigated. Creep rupture tests were performed at 150℃ and 200℃ at 50 MPa and 70 MPa. The microstructure of the Mg-4Al-2Sn alloy initially had Mg17Al12 and Mg2Sn phases. The addition of Sr resulted in the formation of a ternary MgSnSr phase. Creep strength increased with an increasing Sr due to thermally stable MgSnSr precipitates, which suppressed coarsening of the Mg17Al12precipitates during creep. Scanning electron microscopy showed that Mg17Al12 phases at the grain bounda-ries are the starting point of void initiation, the cracks propagated along the grain boundaries. However, the MgSnSr phase interrupted crack propagation.
반응 용탕단조한 (Al2O3 SiO2+Ni) / Al 하이브리드 금속복합재료의 제조 및 특성
김상석,박익민,김성준,최일동 ( Sang Suk Kim,Ik Min Park,Sung Joon Kim,Il Dong Choi ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.4
N/A Mechanical properties of (10%Al₂O₃·SiO₂+5%Ni)/Al hybrid composites fabricated by the reaction squeeze casting were compared with those of (15%Al₂O₃·SiO₂)/Al composites. Al-Ni intertmetallic compounds (10-20㎛) formed by the reaction between nickel powder and molten aluminum were uniformly distributed in the Al matrix. These intermetallic compounds were identified as Al₃Ni using X-ray diffraction analysis and they resulted in beneficial effects on room and high temperature strength and wear resistance. Microhardness values of (10%Al₂O₃·SiO₂+5%Ni)/Al hybrid composite were greater by about 100Hv than those of (15%Al₂O₃·SiO₂)/Al composite. Wear resistance of (10%Al₂O₃·SiO₂+5%Ni)/Al hybrid composites was superior to that of (15%Al₂O₃·SiO₂)/Al composites regardless of the applied load. While tensile and yield strength of (10Al₂O₃·SiO₂+5%Ni)/Al hybrid composites were greater at room temperature and 300℃, strength drop at high temperature was much smaller in hybrid composites.
Si<sub>0.8</sub>Ge<sub>0.2</sub>계 합금에서 열전특성에 미치는 B의 영향
황성두,최우석,박익민,박용호,Hwang, Sung-Doo,Choi, Woo-Suk,Park, Ik-Min,Park, Yong-Ho 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.4
P-type thermoelectric material $Si_{0.8}Ge_{0.2}$ was sintered by Hot Press process (HP) and the effect of boron ($0.25{\sim}2$ at%) addition on the thermoelectric properties were reported. To enhance the thermoelectric performances, the $Si_{0.8}Ge_{0.2}$, alloys were fabricated by mechanical alloying (MA) and HP. The carrier of p-type SiGe alloy was controlled by B-doping. The effect of sintering condition and thermoelectric properties were investigated. B-doped SiGe alloys exhibited positive seebeck coefficient. The electrical conductivity and thermal conductivity were increased at the small amount of boron content ($0.25{\sim}0.5$ at%). However, they were decreased over 0.5 at% boron content. As a result, the small addition of boron improved the Z value. The Z value of 0.5 at% B doped $Si_{0.8}Ge_{0.2}$ B alloy was $0.9{\times}10{-4}/K$, the highest value among the prepared alloys.
무가압침투법에 의한 전자패키징 재료용 Al / SiCp 복합재료의 제조
최일동,김성준,박익민 ( Il Dong Choi,Sung Joon Kim,Ik Min Park ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.1
N/A Infiltration behavior of Al-Mg alloys in SiC_p powder bed using pressureless infiltration technique have been studied. The manufacturing of Al/SiC_p composites by pressureless infiltration was successful when Mg was added over 8% in Al alloy matrix. Processing time and temperature to complete Infiltration through SiC_p bed was decreased with increasing Mg content in Al alloy. When Mg powder was added in SiC_p bed, processing temperature for successful infiltration was decreased. Volume fraction of SiC_p in composites was increased with increasing the mixing ratio of coarse SiC particles.