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전기도금된 Cu-Sn과 Ni preplated frame의 특성 비교
이대훈(D. H. Lee),장태석(T. S. Jang),홍순성(S. S. Hong),이지원(J. W. Lee),양형우(H. W. Yang),한병근(B. K. Hahn) 한국표면공학회 2006 한국표면공학회지 Vol.39 No.6
In order to improve the performance of PPFs (Pre-Plated Frames), a PPF that employed a Cu-Sn alloy instead of conventionally used Ni was developed and then its properties were investigated. It was found that the electoplated Cu-Sn alloy layer was a mixture of uniformly distributed fine crystallites, resulting in better wettability and crack resistance than those of Ni PPF. Moreover, as in Cu/Ni/Pd/Au PPF, migration of copper atoms from the base metal to the top of the Cu/Cu-Sn/Pd/Au PPF surface was not found although the Cu-Sn layer itself contained considerable amount of copper. It was expected that, by using the newly developed Cu-Sn PPF, any possible heat generation and signal interrupt caused by an external electro-magnetic field could be reduced because the Cu-Sn layer was paramagnetic, i.e., nonmagnetic.
금속간화합물 Ni3Al 의 기계적합금화거동과 상온인장성질
홍순성,권숙인 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.7
The microstructural evolution and alloying behavior with milling time during mechanical alloying (MA) of elemental powders with nominal composition Ni-17.5Al-8Cr-0.5Zr-0.4B(at%), and the effect of microstructure on the room temperature tensile properties of hot-extruded MA powders were investigated. The powders milled for 360min, which were considered to be in steady state, consisted of Al-supersaturated disordered solid solution with small amount of amorphous phase and α-Al₂O₃ particles produced by decomposition of process control agent during milling. Metallographic examinaton of hot-extruded powders showed very fine grains containing L1₂-type ordered Ni₃Al, disordered phase and finely dispersed oxides. The refined grain size and the oxide dispersoids constributed to the yield strength as high as 1593MPa and the ductility of 8.6%. The results in this study indicate that the mechanical alloying process is suitable for the production of very fine grained intermetallic compounds with very high strength.
홍순성,권숙인 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.6
The effect of microstructure on the superplastic deformation of Ni₃Al - base alloys produced by mechanical alloying (MA) was investigated. Metallographic examination of hot-extruded MA powders showed sub-micron size grains consisting of Ll₂-type ordered Ni₃Al and disordered γ phase dispersed with oxides. The refined grain size and the oxide dispersoids contributed to the typical fine grain superplastic deformation behavior. The maximum elongation of 391% was obtained by the tensile test at 1000℃ under a strain rate of 1.0×10^(-2)/s, and the strain rate sensitivity exponent (m) value was about 0.3 in the strain rate range from 1.0×10^(-3)/s to 3.16×10^(-2)/s. The results indicate that the mechanical alloying process is suitable for the aroduction of fine grained intermetallic compounds and the improvement of superplastic properties at high strain rate.