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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Nd, SbNd and Sb3Nd4 and their interactions with the cladding alloy HT9
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Nd, SbNd and Sb3Nd4 and their interactions with the cladding alloy HT9

机译：ND，SBND和SB3ND4及其与包层合金HT9的相互作用

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Lanthanide fission products, such as neodymium, formed during the irradiation of metallic fuels are known to cause deleterious effects from chemical interactions occurring at the fuel-cladding interface; a phenomenon known as fuel-cladding chemical interaction (FCCI). The use of fuel-based additives that bind with the lanthanide elements within the fuel meat, alleviating their interactions at the fuel-cladding interface, is one potential method proposed to mitigate the FCCI phenomenon and extend the burnup potential of such metallic fuel systems. In this study, antimony (Sb) is evaluated as one such additive, and neodymium (Nd) is used to represent the lanthanides. A Sb-Nd alloy is fabricated, which consists of two intermetallic phases, SbNd and Sb3Nd4. Isothermal diffusion couple experiments are carried out at 675 degrees C for 24 h between Nd and the Fe-12Cr based HT9 cladding alloy. The results are compared against similar diffusion couple experiments carried out between the Sb-Nd alloy and also HT9. Inter-diffusion between Nd/HT9 diffusion couple is characterized and the phases Fe17Nd5 and Fe17Nd2 were found to form whereas no interactions were observed in the Sb-Nd/HT9 diffusion couple. The lack of compound forming tendencies between Fe, the primary alloying constituent of HT9, and SbNd is elucidated through density functional theory (DFT) calculations on enthalpy of mixing, aligning well with the experimental observations. The strong binding of Nd with Sb appears to be favorable, alleviating Nd interactions with HT9 constituent elements. (C) 2020 Elsevier B.V. All rights reserved.
机译：已知在金属燃料照射期间形成的镧系元素裂变产品，例如在金属燃料的照射期间形成的有害影响在燃料包层界面发生的化学相互作用;称为燃料包层化学相互作用（FCCI）的现象。使用与燃料肉内的镧系元素结合的基于燃料的添加剂，减轻燃料包层界面的相互作用是提出的一种潜在方法，以减轻FCCI现象并延长这种金属燃料系统的燃烧电位。在该研究中，将锑（Sb）评价为一种这样的添加剂，并且使用钕（Nd）来表示镧系元素。制造SB-ND合金，其由两个金属间相，SBND和SB3ND4组成。等温漫射耦合实验在Nd和Fe-12Cr基质的HT9包层合金之间以675℃进行24小时。将结果与在Sb-Nd合金和HT9之间进行的类似扩散耦合实验进行比较。 Nd / HT9扩散耦合之间的间际扩散特征，并且发现阶段Fe17ND5和Fe17ND2形成，而在SB-Nd / HT9扩散夫妇中未观察到相互作用。通过在混合焓上阐明Fe，HT9的主要合金组分和SBND之间的化合物形成倾向，并阐明了混合焓，与实验观察相一致。 Nd与Sb的强效应似乎是有利的，减轻与HT9组成元素的ND相互作用。 （c）2020 Elsevier B.v.保留所有权利。

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