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A model for defect formation in materials exposed to radiation
Matter and Radiation at Extremes ( IF 5.1 ) Pub Date : 2021-01-07 , DOI: 10.1063/5.0030158
Sergio Davis 1, 2 , Felipe González-Cataldo 3, 4 , Gonzalo Gutiérrez 4 , Gonzalo Avaria 1, 2 , Biswajit Bora 1, 2 , Jalaj Jain 1 , José Moreno 1, 2 , Cristian Pavez 1, 2 , Leopoldo Soto 1, 2
Affiliation  

A simple model for the stochastic evolution of defects in a material under irradiation is presented. Using the master-equation formalism, we derive an expression for the average number of defects in terms of the power flux and the exposure time. The model reproduces the qualitative behavior of self-healing due to defect recombination, reaching a steady-state concentration of defects that depends on the power flux of the incident radiation and the material temperature, while also suggesting a particular time scale on which the incident energy is most efficient for producing defects, in good agreement with experimental results. Given this model, we discuss the integral damage factor, a descriptor that combines the power flux and the square of the irradiation time. In recent years, the scientific community involved in plasma-facing materials for nuclear fusion reactors has used this parameter to measure the equivalent material damage produced in experiments of various types with different types of radiation and wide ranges of power flux and irradiation time. The integral damage factor is useful in practice but lacks formal theoretical justification. In this simple model, we find that it is directly proportional to the maximum concentration of defects.

中文翻译:

暴露于辐射的材料中缺陷形成的模型

提出了一种在辐照下材料中缺陷随机演化的简单模型。使用主方程式,我们根据功率通量和曝光时间得出平均缺陷数的表达式。该模型重现了由于缺陷复合而导致的自修复的定性行为,达到了取决于入射辐射功率通量和材料温度的缺陷稳态浓度,同时还建议了入射能量的特定时间范围产生缺陷的效率最高,与实验结果非常吻合。给定该模型,我们将讨论积分损伤因子,该因子将功率通量和辐照时间的平方相结合。最近几年,核聚变反应堆的面向等离子体材料的科学界已使用此参数来测量在各种类型的实验中产生的等效材料破坏,这些实验具有不同类型的辐射以及宽范围的功率通量和辐射时间。积分损伤因子在实践中很有用,但缺乏正式的理论依据。在这个简单的模型中,我们发现它与缺陷的最大浓度成正比。
更新日期:2021-01-15
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