论文部分内容阅读
利用透射电镜(TEM)和扫描电镜(SEM)研究了采用相同工艺制备的Zr-1.2Sn-1Nb-0.3Fe、Zr-0.4Sn-1Nb-0.3Fe和Zr-0.4Sn-0.65Nb-0.3Fe锆合金板材中的第二相粒子特征。结果表明,Sn在第二相中存在偏聚,第二相颗粒的形成过程中Nb直接析出,合金中第二相主要为密排六方结构Zr(Nb,Fe)2;当Nb含量为1wt%、Sn含量从0.4wt%增加到1.2wt%时,第二相面密度减小而平均直径变大,第二相中Nb/Fe比升高;当Sn含量为0.4wt%、Nb含量从0.65wt%增加到1wt%时,第二相面密度增大而平均直径变小,第二相中Nb/Fe比同样升高。
The microstructures of Zr-1.2Sn-1Nb-0.3Fe, Zr-0.4Sn-1Nb-0.3Fe and Zr-0.4Sn-0.65Nb-0.3Fe zirconium alloys prepared by the same process were investigated by transmission electron microscopy (TEM) and scanning electron microscopy (SEM) Second phase particles in alloy sheet. The results show that there is segregation of Sn in the second phase and Nb precipitates directly during the formation of the second phase. The second phase in the alloy is mainly composed of hexagonal close-packed Zr (Nb, Fe) 2. When the Nb content is 1wt% , The content of Sn increases from 0.4wt% to 1.2wt%, the density of the second phase decreases and the average diameter increases, while the ratio of Nb / Fe increases in the second phase. When the Sn content is 0.4wt% and the Nb content is from 0.65 When the wt% increases to 1 wt%, the second phase density increases while the average diameter becomes smaller, and the Nb / Fe ratio in the second phase also increases.