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在Zr-0.70Sn-0.35Nb-0.30Fe(质量分数,%)合金成分基础上添加26~570μg/g的S制备成实验合金,用SEM、TEM及其配置的EDS研究了S含量对合金中第二相成分及晶体结构的影响。结果表明:不加S的重熔合金中的第二相均为密排六方结构的Zr(Nb,Fe)2,添加S以后合金中出现了正交结构的Zr3Fe第二相,并随着S含量的增加,Zr3Fe的数量也相应增多;添加的S含量为190μg/g时,合金中还出现了四方结构的Zr9S2第二相,并随着S含量的进一步增加,Zr9S2第二相的数量增多;同一成分合金中随第二相粒子尺寸的增大,第二相中的Nb/Fe比值逐渐降低。本研究制备的含S锆合金中,固溶在ɑ-Zr基体中的最大S含量在26~190μg/g之间,超过固溶含量的S以Zr9S2第二相析出,并没有进入其它第二相中。
Based on the alloy composition of Zr-0.70Sn-0.35Nb-0.30Fe (mass fraction,%), 26-570μg / g S was added to prepare the experimental alloy. The effect of S content on the alloy was investigated by SEM, TEM and EDS. Second phase composition and the influence of crystal structure. The results show that the second phase in the remelted alloy without S is the dense hexagonal structure of Zr (Nb, Fe) 2, and the orthorhombic Zr3Fe second phase appears in the alloy after addition of S, And the amount of Zr3Fe increased accordingly. When the S content was 190μg / g, the tetragonal Zr9S2 second phase appeared in the alloy, and with the further increase of S content, the amount of Zr9S2 second phase increased With the increase of the size of the second phase particles in the same composition alloy, the Nb / Fe ratio in the second phase gradually decreases. In the alloy containing S-Zr prepared in this study, the maximum S content of the solid solution in the Zr-Zr matrix is between 26 and 190 μg / g, and the S exceeding the solution content precipitates as the second phase of Zr9S2 and does not enter the other second Phase.