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利用堆外静态高压釜实验研究了Zr-1Nb-x Ge-yBi(x=0.05-0.1,y=0.2-0.4,质量分数,%)合金在400℃/10.3 MPa过热蒸汽和360℃/18.6 MPa去离子水中的耐腐蚀性能,利用高分辨透射电镜(HRTEM)和高分辨扫描电镜(HRSEM)研究了合金和合金腐蚀后氧化膜的显微组织。结果表明,合金中只存在β-Nb、Zr Nb Fe型和Zr3Ge 3种第二相;在Zr-1Nb合金中复合添加Ge和Bi可明显提高合金的耐腐蚀性能,其中Zr-1Nb-0.05Ge-0.3Bi合金的耐腐蚀性能相对较好,优于单独添加Ge的Zr-1Nb-0.05Ge合金和单独添加Bi的Zr-1Nb-0.3Bi合金。这进一步说明固溶在α-Zr中的Ge和Bi确实是改善Zr-1Nb-x Ge-yBi合金耐腐蚀性能的主要原因。
The effects of Zr-1Nb-x Ge-yBi (x = 0.05-0.1, y = 0.2-0.4, mass fraction,%) on the supercritical steam at 400 ℃ and 10.3 MPa and at 360 ℃ and 18.6 MPa The corrosion resistance of the alloy was studied by using HRTEM and HRSEM. The results show that there are only three kinds of β-Nb, Zr Nb Fe and Zr3Ge second phases in the alloy. The addition of Ge and Bi in the Zr-1Nb alloy can obviously improve the corrosion resistance of the alloy. The Zr-1Nb-0.05Ge The corrosion resistance of -0.3Bi alloy is better than that of Zr-1Nb-0.05Ge alloy with Ge alone and Zr-1Nb-0.3Bi alloy with Bi alone. This further shows that Ge and Bi dissolved in α-Zr are the main reasons for improving the corrosion resistance of Zr-1Nb-xGe-yBi alloy.