A systematic multiscale-informed model is developed to predict the irradiation growth behavior of Zr-Sn-Nb alloys, which considers the anisotropy and temperature dependence of both plasticity and irradiation, as well as the alloying effect of Zr alloys. This model consists of a cluster dynamics submodel to consider the kinetics of irradiation defect, an alloying effect submodel informed by atomic simulations and experiments, a microstructure transition submodel derived from discrete dislocation dynamics, and a continuous irradiation growth submodel based on crystal plasticity. It effectively captures the irradiation-induced coevolution of multiple microstructures, including point defects, mobile clusters, dislocation lines and irradiation loops on the prismatic and basal plane, as well as Nb-induced precipitates. It is suitable for high-dose irradiation conditions as it reasonably considers the transition from high-density irradiation loops to tangled dislocation network. The predicted irradiation growth strain, as well as the density and size of irradiation loops, are in good agreement with almost all the available experiments for pure Zr, Zr-Sn, Zr- Nb, and Zr-Sn-Nb alloys at different irradiation doses in the temperature range of 473 - 673 K. This work is hoped to provide a powerful tool for developing irradiation resistance cladding materials.

中文翻译：

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Zr-Sn-Nb 合金的多尺度信息辐照生长模型


开发了一个系统的多尺度信息模型来预测 Zr-Sn-Nb 合金的辐照生长行为，该模型考虑了塑性和辐照的各向异性和温度依赖性，以及 Zr 合金的合金化效应。该模型包括一个考虑辐照缺陷动力学的簇动力学子模型、一个由原子模拟和实验提供的合金效应子模型、一个从离散位错动力学得出的微观结构过渡子模型和一个基于晶体塑性的连续辐照生长子模型。它有效地捕获了辐照诱导的多种微结构的共演化，包括棱柱和基平面上的点缺陷、移动簇、位错线和辐照环，以及 Nb 诱导的沉淀物。它适用于高剂量照射条件，因为它合理地考虑了从高密度照射环到缠结位错网络的过渡。在 473 - 673 K 的温度范围内，在不同辐照剂量下，预测的辐照生长应变以及辐照回路的密度和大小与纯 Zr、Zr-Sn、Zr-Nb 和 Zr-Sn-Nb 合金的几乎所有可用实验都非常吻合。这项工作有望为开发抗辐照熔覆材料提供有力的工具。