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将几种Nb、Fe含量不同的锆合金样品在1050℃保温0.5h后水冷,在560℃回火10h,用带能谱分析(EDS)的透射电子显微镜研究它们的第二相粒子。结果显示:随着合金样品中Nb元素含量的提高及Nb/Fe比的增加,第二相从Zircaly-4合金中密排六方结构的Zr(Fe,Cr)2向密排六方的Zr(Nb,Fe,Cr)2转变,同时Zr(Nb,Fe,Cr)2中的Nb/Fe比也在提高。当样品中Nb元素含量和Nb/Fe比提高到一定程度,除了生成密排六方结构的Zr(Nb,Fe,Cr)2,同时出现了体心立方结构的βNb。
Several zirconium alloy samples with different contents of Nb and Fe were cooled in water at 1050 ℃ for 0.5h and then tempered at 560 ℃ for 10h. The second phase particles were studied by transmission electron microscopy with energy dispersive spectroscopy (EDS). The results show that with the increase of Nb content and the increase of Nb / Fe ratio in the alloy samples, the second phase changes from densely packed hexagonal Zr (Fe, Cr) 2 in the Zircaly-4 alloy to densely packed hexagonal Zr , Fe, Cr) 2 transformation, while the Nb / Fe ratio in Zr (Nb, Fe, Cr) 2 also increased. When the Nb content and Nb / Fe ratio in the sample increase to some extent, besides the dense hexagonal structure of Zr (Nb, Fe, Cr) 2, the body-centered cubic βNb appears at the same time.