Ce／Nb离子注入Zr-4合金氧化行为的比较

利用MEVVA源对Zr-4合金分别进行1×1016 ions/cm2至1×1017ions/cm2剂量的铈离子与铌离子注入,比较了Ce/Nb离子注入对Zr-4合金氧化行为的影响.结果表明,铈离子注入可以较大程度地提高Zr-4合金的抗氧化性能,而铌离子注入则在一定程度上使Zr-4合金的氧化性能下降.GAXRD分析显示,铈离子注入促进了氧化锆由单斜相向六方相的转变,但铌离子注入却对氧化锆相的转变没有影响.并探讨了Ce/Nb离子注入影响Zr-4合金氧化行为的机理.

Comparison of the Oxidation Behaviors of Zircaloy-4 Implanted with Cerium and Niobium Ions

The aim of the work was to make the comparison of the effect of cerium ion implantation with that of niobium ion implantation by using a MEVVA source at the energy of 40 keV with a dose ranging from 1 × 1016 ions/cm2to 1 × 1017 ions/cm2 at the maximum temperature of 130℃. It was interesting to find that a significant improvement was achieved in the oxidation behavior of cerium-implanted Zircaloy-4 compared with that of as-received Zircaloy-4. The oxidation behavior of niobiumimplanted Zircaloy-4, however, was somewhat deteriorated after niobium ions implantation. Glancing Angle X-ray Diffraction (GAXRD) showed that the addition of cerium transformed the phase from monoclinic zirconia to hexagonal zirconia, while no phase transformation occurred as a result of niobium ions implantation, no matter how much the dose of implanted niobium ions was. The mechanisms of the improvement or deterioration of the oxidation behavior were discussed further.