Zr-Sn-Nb-Fe合金显微组织及耐腐蚀性能研究

将Zr-Sn-Nb-Fe合金样品冷轧后在500和560℃下分别保温不同时间，在350℃、16.8MPa、含70μg/gLi⁺的LiOH水溶液中腐蚀，500℃/100h样品的耐腐蚀性能最好。用透射电镜（TEM）研究了这些样品的显微组织和第二相，观测到随着保温时间延长，500℃下保温样品中的第二相由连续片层逐渐转变成带状分布的颗粒，保温时间达到100h时，基体内析出βNb。560℃下保温样品与500℃下保温样品有相似的组织转变过程，只是时间大幅缩短，保温仅10h时，基体已完全再结晶为等轴晶。

Microstructure and Corrosion Resistance of Zr-Sn-Nb-Fe Alloy

Zr-Sn-Nb-Fe alloy specimens tempered at 500 and 560 ℃ with different time after cold rolling, respectively, were exposed to 70 μg/g Li⁺ LiOH solution at 350 ℃, 16. 8 MPa. The microstructures and second phases were examined by transmission electron microscopy (TEM). It is found that the specimen treated by 500 ℃/100 h has the best corrosion resistance among all the specimens. TEM analysis of the specimens tempered at 500 ℃ with different time shows that the second phase changes from the seriate strips to the banding particles with the increasing of tempering time, and the fine βNb particles precipitates from the matrix as tempered to 100 h. The transformation process of specimens tempered at 560 ℃ is similar to those tempered at 500 ℃ except the shorter transition time，and the matrix is recrystallized to the equiaxed grain completely as tempered to 10 h.