Tungsten is considered as the plasma-facing material in the nuclear fusion device, which has to withstand coupled irradiation, mechanical and thermal conditions. To guarantee the safe operation of energy devices, it is essential to accurately predict its response. As a typical body center cubic material, the plasticity of tungsten is believed to exhibit the strong temperature dependence and non-Schmid effect. It is far from well understood how these plasticity features influence the behavior of irradiated tungsten. To disclose this mystery, a crystal plasticity model is developed, which considers the kink-pair mechanism of screw dislocations, the contribution of edge dislocations, and the interaction between dislocations and irradiation defects. The model is firstly verified through comparing with the available experimental results at different temperatures, and then used to disclose the temperature dependence of deformation localization in irradiated tungsten. It is found that post-irradiation mechanical tests at room temperature underestimate the occurrence of dislocation channel and deformation localization at higher temperatures, while in the low temperature regime, the thermal-activated dislocation mobility law may lead to a short-term deformation localization without clear dislocation channels. Conditions for the localization of deformation in irradiated tungsten are discussed, which is hoped to guide the reliable design of tungsten components used in fusion and fission reactors.

钨被认为是核聚变装置中面向等离子体的材料，它必须承受耦合辐射、机械和热条件。为了保证能源设备的安全运行，准确预测其响应至关重要。作为典型的体心立方材料，钨的塑性被认为表现出强烈的温度依赖性和非施密德效应。这些可塑性特征如何影响辐照钨的行为尚不清楚。为了揭开这个谜团，开发了一种晶体塑性模型，该模型考虑了螺型位错的扭结对机制、刃型位错的贡献以及位错与辐照缺陷之间的相互作用。该模型首先通过与不同温度下现有实验结果的比较进行验证，然后用于揭示辐照钨中变形局部化的温度依赖性。发现室温辐照后力学测试低估了高温下位错通道的发生和变形局域化，而在低温区，热激活位错迁移规律可能导致短期变形局域化，而没有明确的错位通道。讨论了辐照钨中变形局部化的条件，以期指导聚变和裂变反应堆中使用的钨部件的可靠设计。然后用于揭示辐照钨中变形局部化的温度依赖性。发现室温辐照后力学测试低估了高温下位错通道的发生和变形局域化，而在低温区，热激活位错迁移规律可能导致短期变形局域化，而没有明确的错位通道。讨论了辐照钨中变形局部化的条件，以期指导聚变和裂变反应堆中使用的钨部件的可靠设计。然后用于揭示辐照钨中变形局部化的温度依赖性。发现室温辐照后力学测试低估了高温下位错通道的发生和变形局域化，而在低温区，热激活位错迁移规律可能导致短期变形局域化，而没有明确的错位通道。讨论了辐照钨中变形局部化的条件，以期指导聚变和裂变反应堆中使用的钨部件的可靠设计。而在低温状态下，热激活位错迁移规律可能导致短期变形局部化，而没有明确的位错通道。讨论了辐照钨中变形局部化的条件，以期指导聚变和裂变反应堆中使用的钨部件的可靠设计。而在低温状态下，热激活位错迁移规律可能导致短期变形局部化，而没有明确的位错通道。讨论了辐照钨中变形局部化的条件，以期指导聚变和裂变反应堆中使用的钨部件的可靠设计。