The microstructure evolution in irradiated materials can be conveniently modelled, at large scale, by cluster dynamics (CD). In this approach, the effect of the local environment of defect clusters is neglected. In this article, we first check the validity of this assumption by comparing CD to object kinetic Monte Carlo (OKMC) simulations. We show that for microstructures produced under irradiation, taking into account in CD only the average dependency of clusters’ growth rate on volume fraction does not permit to reproduce reference OKMC results. Accordingly, the sink strength dispersion, quantified using OKMC, is introduced in CD, using a new formalism depending on the Voronoi volumes of defect clusters. CD calculations including sink strength dispersion are shown to be in better agreement with reference OKMC simulations and experimental observations than are classical CD calculations.

可以通过簇动力学（CD）方便地大规模模拟受辐照材料的微观结构演变。在这种方法中，缺陷簇的局部环境的影响被忽略了。在本文中，我们首先通过将CD与对象动力学蒙特卡洛（OKMC）仿真进行比较来检查该假设的有效性。我们表明，对于在辐照下产生的微观结构，仅考虑CD中簇的生长速率对体积分数的平均依赖性，就无法再现OKMC的参考结果。因此，根据缺陷簇的Voronoi量，使用新的形式主义将使用OKMC量化的下沉强度离散度引入CD中。