Zr-1.5Nb-xSn 합금의 미세조직 및 부식에 미치는 열처리 온도와 Sn 함량의 영향 = Effects of Annealing Temperature and Sn Content on the Microstructure and Corrosion of Zr-1.5Nb-xSn Alloys

다국어 초록 (Multilingual Abstract)

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.