Irradiation Effects of Fusion Reactor Matenals under Dynamic and Variable/Complex Conditions

在聚变工况下，由于发电量的可控性和偶然性变化，辐照条件的变化（如温度循环）对性能变化的影响将是一个严重的问题。这些辐照效应引起的材料性能退化是材料辐照效应研究的重要课题，但由于辐照实验的困难，其具体现象尚未得到阐明。近年来，中子辐照条件下这些类型的退化预测被认为是聚变堆的重要设计参数，本文的目标是表征聚变堆结构和功能材料在反应堆运行过程中的损伤过程。只有在辐照过程中才会出现动力学现象，辐照条件下材料的性质发生变化，这些变化对应于反应器的稳态和非稳态运行 ...更多信息 研究了原子核嬗变的复杂条件。为了研究除累积效应外的动态效应，实验测试矩阵的参数变得巨大。因此，在有限的辐照量下，通过精心策划的辐照实验，需要对辐照机理有深入的了解，并进行理论预测，以获取关键信息。测试矩阵侧重于低活化结构材料和功能材料，包括绝缘陶瓷和耐火合金。(1)低活化铁素体钢的辐照蠕变测量与力学性能检验。(2)复合/复杂条件下辐照对钒合金力学性能和微观结构演变的影响，（3）陶瓷导电/导热率的原位测量，（4）陶瓷和金属/陶瓷接头的力学性能，（5）高能量密度辐照下温度变化对微观结构演变和力学性能的影响，（6）复杂辐照条件下的嬗变效应，（7）建模与理论研究。最后，对该研究的网络活动、裂变与聚变中子辐照研究的数据关联进行了全面的讨论。少

The influence of varying irradiation conditions like temperature cycle on the property change will be serious problem for the components under the fusion operating conditions, where the controlled and accidental variation of power generation will take place. Degradation of material performance by these irradiation effects have been recognized as important subjects of irradiation effects on materials but the detail of phenomena have not been clarified yet because of their difficulties of irradiation experiments. Recently prediction of these types of degradation during neutron irradiation conditions are recognized as important design parameter of fusion reactors.The objective of this work is characterization of damage process during reactor operation for structural and functional materials of fusion reactor. Dynamic phenomenon only in irradiation and the material property changes in the irradiation conditions, which are varied corresponding to the steady and unsteady operation of the rea … More ctor and complex condition including the nuclear transmutation are studied. In order to study the dynamic effect in addition to the cumulative effects, the experimental test matrix becomes huge in parameters. Therefore, mechanistic understanding and theoretical predictions are required to obtain key information through well-planned irradiation experiment with limited amount of irradiation volume.In concretely, the following seven tasks were set up to organize irradiation experiment effectively. Test matrix focuses on low activation structural materials and functional materials including insulating ceramics and refractory alloys. (1) Irradiation creep measurement and mechanical property examination of low activation ferritic steels. (2) Irradiation effects on mechanical properties and micro structural evolution of vanadium alloys under combined/complex conditions, (3) In-situ measurements of electrical/thermal conductivity of ceramics, (4) mechanical properties of ceramics and metal/ceramics joints, (5) Varying temperature effect on microstructural evolution and mechanical properties under irradiation to high fluences, (6) Transmutation effect under complex irradiation conditions, (7) Modeling and theoretical studies. Finally, overall discussion was carried out on network activities of the research, and data correlation between fission and fusion neutron irradiation studies. Less