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Microstructure and Mechanical Properties of CoCrFeMnNiSnx High‑Entropy Alloys
X. Y. Gu,Y. N. Dong,Y. X. Zhuang,J. Wang 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.3
The objective of this study is to investigate the effect of Sn content on the microstructure and mechanical properties of theCoCrFeMnNiSnxhigh entropy alloys. The microstructure and mechanical properties of the alloys have been studied by X-raydiffraction, scanning electron microscopy, room-temperature compressive tests and Vickers hardness tests. It has been foundthat Sn has a great effect on the microstructure and mechanical properties of the alloys. The CoCrFeMnNi alloy has a simpleFCC phase structure, while a few white precipitations (MnNi2Sn-like) are observed in the Sn0.03and Sn0.07alloys. With furtheradditions of Sn, the microstructure of Sn0.1,Sn0.3and Sn0.5changes to a typical dendrite structure, the dominated dendriteregion has a lattice of FCC structure which is enriched with Cr, Co and Fe, and the interdendritic region is enriched withMn, Ni and Sn. The volume of the MnNi2Sn-like phase increases with Sn content increasing. The addition of Sn enhancesthe formation of the MnNi2Sn-like phase in the CoCrFeMnNiSnxalloys, and improves the hardness and strength of as-castalloys, but reduces the ductility of the alloys. The strengthening mechanism of alloys was solid solution strengthening andformation of the MnNi2Sn-like phase. In the CoCrFeMnNiSn0.03and CoCrFeMnNiSn0.07alloys, the solid solution is thedominant mechanism. With the Sn content increasing, the second phase strengthening is the dominant mechanism.
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Zn-Sn 합금을 이용한 강구조물의 금속용사공법 방식성능평가 연구
류화성,정동근,이한승 한국건축시공학회 2014 한국건축시공학회지 Vol.14 No.6
The purpose of this study is to evaluate the corrosion protective properties of a Zn-Sn metal spray methodaccording to the contents of Zn and Sn by a CASS test and the electrochemical theory. In the experiment, the CASStest and the electrochemical test were conducted to investigate the corrosion protective property of the Zn-Sn MetalSpray system, the Zinc galvanizing system, and the heavy duty coating system. As a result, it was confirmed that theZn-Sn (65:35) Metal Spray system had very high corrosion protective property through the electrochemicalcharacteristic as comparison with the other anti-corrosion systems and was very effective to prevent steel productsfrom corrosion. 본 연구에서는 전기화학적인 시험 및 CASS Test(염수분무시험)을 실시하여 중방식도장 시험체와 용융아연도금 시험체, Zn-Al 시험체와의 비교를 통해Zn-Sn 금속용사의 방식 성능을 평가하였다. 시험 결과, 전기화학 시험을 통하여 Zn-Sn / Zn-Al 상온금속용사 시스템 공법의 방식원리는 방식전위에 의하여 확보되는 것을 확인하였으며 강구조물의 방식 공법으로서상온금속용사 공법은 용융아연도금 공법과 중방식 도장공법과 비교하여 매우 우수한 방식성능을 가지고 있는것이 CASS 시험을 통하여 검증되었다. 특히 Zn-Sn 금속용사와 Zn-Al 금속용사를 비교해본 결과 그 방식성이 현저하게 차이가 있지는 않았으나 Zn-Sn(65:35)비율의 시험체가 가장 우수하였다. 또한 중방식 도장은손상된 부분에서 현저하게 녹이 발생하고 도막이 박리되지만, Zn-Sn / Zn-Al 상온금속용사 시스템 공법은갈바닉 희생방식에 의하여 매우 높은 부식 방지 특성을가지고 있음을 확인 하였다.
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Zr-1.5Nb-xSn 합금의 미세조직 및 부식에 미치는 열처리 온도와 Sn 함량의 영향
김영화,위명용,백종혁,정용환 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.2
The corrosion behaviors of Zr-based alloys were investigated with a series of Zr-1.5Nb-xSn ternary alloys which had the variations of β_(Nb) content and final annealing condition. As a result of microstructural study, the _(enriched) was observed in the samples annealed at 640℃, regardless of Sn content. The volume fraction of the precipitates and the Nb concentration in the precipitates did tend to be increased with increasing the Sn content. The samples annealed at 470℃ and 570℃, where β_(Nb) precipitated, exhibited better corrosion resistance than those annealed at 640℃ where β_(Zr) precipitated. The corrosion resistance of the Zr-1.5Nb-xSn alloy system did tend to increase with increasing Sn content. This would be resulted from the reduction of Nb solubility in matrix with increasing Sn content. Thus it eventually facilitate the formation of β_(Nb) phase from the solid solution state of Nb in Zr matrix. The Nb concentration in β_(Nb) phase increased with increasing the Sn content. This would contribute to the formation of β_(Nb) from soluble Nb that existed in the solid solution of Zr matrix.
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Sn-4Ag계 Pb-free 솔더 접합부의 Cu 함량에 따른 접합강도 특성평가
하벼리(Byeori Ha),유효선(Hyosun Yu),양성모(Sungmo Yang) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The evaluation on reliability of environment-friendly Pb-free solder and solder joints is very important. This study compared the shear strength of two different plates(Cu and Ni plate). Also, shear strength of joints of Sn-37Pb solder and Sn-Ag solder alloy with different Cu contents(0, 0.5, 1 wt.%) have been studied. The shear strength tests on various reflow time are performed at 30 and 50℃. The shear strength of Pb-free solder joints are higher than Sn-37 Pb solder joints, generally. In the case of Cu plate, shear strength of Sn-4Ag solder joints increased with reflow time. And solder joints with Cu contents are seems to similar in strength regardless of reflow time. on the other hand, in the case of Ni plate joints, shear strength of Sn-37Pb solder joints are similar to Sn-4Ag solder joints. Like Cu plate joints, solder joints with Cu contents are seems to similar in strength regardless of reflow time.
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