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Ni 층의 두께에 따른 Sn-3.5wt%Ag 솔더 합금의 계면 반응
이혁모,최원경 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.11
Sn-3.5Ag (compositions are all in weight percent unless specified otherwise) solder alloys were soldered on the various substrates of bare Cu plate, Cu plate/Ni(2㎛), Cu plate/Ni(4㎛), and bare Ni plate. The morphology, composition and phase identification of the intermetallic compounds(IMC) at the interface were examined using Scanning Electron Microscopy(SEM) and X-ray diffraction(XRD). With varying the Ni layer thickness, various IMCs were formed, which were Cu_6Sn_5 on bare Cu plate, metastable NiSn₃ + Ni₃Sn₄ on Cu plate/Ni(2㎛), Ni₃Sn₄ on Cu plate/Ni(4㎛) and Ni₃Sn + Ni₃Sn₄ on bare Ni plate. And it was also observed that the wetting behavior was dependent on the Ni layer thickness. Such phenomena seemed to be caused by the type of IMCs differently formed on each substrate. As the soldering time was increased, the changes of the IMC morphology and the wetting behavior were observed on the various substrates. Therefore it was postulated that the Ni layer thickness should be considered as an important parameter in the interfacial reaction and the wetting behavior.
Fe-Cr-Ni 오스테나이트계 스테인리스강의 미소편석과 잔류 δ-페라이트 양에 대한 계산
이혁모,이용득,김선구,서정룡,배준수 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.3
In equilibrium, 304 stainless steel has only γ-austenite phase below about 1170℃ and solutes are uniformly distributed in γ-austenite. Due to incomplete solid-state diffusion, it has retained δ-ferrite as well as γ-austenite and the solute distribution becomes inhomogeneous in each phase. To further understand the solidification behavior of 304 stainless steel, the variation of δ-ferrite amount with temperature and the solute concentration in each phase across the phase boundary are calculated in this study. The calculated solute contents at the interface are in good agreement with experimental data available. It is shown that the equilibrium calculation using 304 steel composition itself produces better results than using equivalent composition. The calculated amounts of retained δ-ferrite using 304 equivalent composition are somewhat higher than experimentally observed values. Much better agreement between calculation results and experimental data is expected if more reliable experimental data can be obtained.