利用高压釜腐蚀实验研究了Zr-1Nb-xBi(x=0.05-0.3,质量分数,％)合金在360℃和18.6 MPa去离子水中的耐腐蚀性能.结果表明,在Zr-1Nb合金的基础上添加Bi能明显改善其耐腐蚀性能,且随着Bi含量的增加,合金的耐腐蚀性能进一步提高.合金显微组织的TEM观察和EDS分析表明,合金中存在ZrNbFe型和β-Nb第二相,Bi含量对第二相的种类、尺寸和数量没有明显的影响；0.3％的Bi可全部固溶在α-Zr基体中,且不影响Nb的固溶含量.氧化膜断口和内表面形貌的SEM观察表明,固溶在α-Zr基体中的Bi能够明显延缓氧化膜显微组织的演化,包括孔隙发展成为微裂纹的过程和柱状晶向等轴晶的转变.
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