【作者】 姚美意； 周邦新； 李强； 张伟鹏； 朱莉； 邹玲红； 张金龙； 彭剑超；

【Author】 YAO Mei-yi;ZHOU Bang-xin;LI Qiang;ZHANG Wei-peng;ZHU Li;ZOU Ling-hong;ZHANG Jin-long;PENG Jian-chao;Laboratory for Microstructures,Shanghai University;Institute of Materials,Shanghai University;

【机构】 上海大学微结构重点实验室； 上海大学材料研究所；

【摘要】 本文选用Zr-4(Zr-1.5Sn-0.2Fe-0.1Cr)、S5(Zr-0.8Sn-0.35Nb-0.4Fe-0.1Cr)和T5(Zr-0.7Sn-1.07Nb-0.32Fe-0.08Cr)和Zr-1Nb共4种合金为母合金,在其成分基础上添加0.05%~0.5%Bi制备成Zr-4+xBi、S5+xBi、T5+xBi和Zr-1Nb+xBi合金,研究了这些合金的显微组织和在不同腐蚀条件下的腐蚀行为。研究结果表明:Bi的添加促进了Zr-4、S5和T5母合金中原来固溶在α-Zr基体中的Sn以第二相形式析出;随着Nb含量的增加,固溶在α-Zr基体的最大Bi含量增大。添加Bi对不同体系锆合金耐腐蚀性能的影响是非常复杂的,与合金中已经存在的其他合金元素密切相关,也与腐蚀水化学条件密切相关。当有较多的Bi固溶在α-Zr基体中时对锆合金的耐腐蚀性能有改善作用,但当Bi以第二相形式析出时则会降低锆合金的耐腐蚀性能。更多还原

【Abstract】 In order to investigate systematically the effect of Bi addition on the corrosion resistance of zirconium alloys,different zirconium-based alloys,including Zr-4(Zr-1.5Sn-0.2Fe-0.lCr),S5(Zr-0.8Sn-0.35Nb-0.4Fe-0.lCr),T5(Zr-0.7Sn-1.0Nb-0.3Fe-0.lCr) and Zr-lNb,were adopted to prepare the zirconium alloys containing Bi of 0~0.5%in mass fraction.These alloys were denoted as Zr-4 +.rBi,S5 +.rBi,T5+.rBi and Zr-lNb +.rBi,respectively.The corrosion behavior of these specimens was investigated by autoclave testing in lithiated water with 0.01 M LiOH or deionized water at 360℃/18.6 MPa and in superheated steam at 400 ℃/10.3 MPa.The microstructure of the alloys was examined by TEM and the second phase particles(SPPs) were analyzed by EDS.Microstructure observation shows that the addition of Bi promotes the precipitation of Sn as second phase particles(SPPs) because Sn is in solid solution in crZr matrix in Zr-4,S5 and T5 alloys.The concentration of Bi dissolved in crZr matrix increase with the increase of Nb in the alloys,and the excess Bi precipitates as Bi-containing SPPs.The corrosion results show that the effect of Bi addition on the corrosion behavior of different zirconium-based alloys is very complicated,depending on their compositions and corrosion conditions.In the case of higher Bi concentration in crZr,the zirconium alloys exhibit better corrosion resistance.However,in the case of precipitation of Bi-containing SPPs,the corrosion resistance gets worse.This indicates that the solid solution of Bi in crZr matrix can improve the corrosion resistance,while the precipitation of the Bi-containing SPPs is harmful to the corrosion resistance.更多还原