Precipitation hardened Copper-Chromium-Zirconium (CuCrZr) alloy is a prime candidate for divertor components in future European DEMOnstration (DEMO) fusion reactors. To develop the DEMO Design Criteria for In-vessel Components (DDC-IC), the failure criterion of CuCrZr needs to be investigated. Hence, the effects of stress triaxiality and loading strain rate on the fracture of solution heat treated and annealed CuCrZr alloys were studied using digital-imaging-correlation and electron microscopy techniques. It was found that an increase in the stress triaxiality caused a significant decrease of over 50% in the equivalent strain to fracture. On the other hand, increasing applied strain rate from 1.3 × 10⁻⁵ s⁻¹to 8.6 × 10⁻³ s⁻¹ had no considerable effects on the yield stress and elongation. However, higher flow stresses and a larger number density of voids were observed under the highest applied strain rate of 8.6 × 10⁻³ s⁻¹. Fracture surface analysis showed that the failure model was dominated by void growth and coalescence for all the tests. This work has been performed within the Engineering Data and Design Integration (EDDI) sub-project of the EUROfusion Materials work package and aimed to contribute to the development of the DEMO Design Criteria for In-vessel Components.

沉淀硬化的铜铬锆合金（CuCrZr）是未来欧洲DEMOnstration（DEMO）聚变反应堆中偏滤器组件的主要候选材料。要开发用于车载部件的DEMO设计标准（DDC-IC），需要研究CuCrZr的失效标准。因此，使用数字成像相关技术和电子显微镜技术研究了应力三轴性和加载应变率对固溶热处理和退火后的CuCrZr合金断裂的影响。发现应力三轴性的增加导致等效断裂应变显着降低了50％以上。另一方面，将施加应变率从1.3×10 ^-5  s ^-1增加到8.6×10 ^-3  s ^-1对屈服应力和伸长率没有显着影响。但是，在最高施加应变率为8.6×10 ^-3  s ^-1时，观察到较高的流动应力和较大的空隙密度。断裂表面分析表明，在所有测试中，破坏模型均以孔隙增长和合并为主导。这项工作是在EUROfusion材料工作包的工程数据和设计集成（EDDI）子项目中完成的，旨在促进开发用于船内组件的DEMO设计标准。