“聚变能”是储量极丰富的安全绿色能源，是人类最理想的未来能源之一。面向等离子体材料(PFM)的抗等离子体辐照问题是“聚变能”利用中有待解决的关键问题之一。PFM需要抵抗等离子体辐照以及高热负荷，钨被认为是PFM的最佳候选材料，在钨的合金化、组织结构和晶体取向等因素对表面抗辐照性能的影响方面已经有大量的相关研究报导。然而，PFM在服役期间要承受持续的温度波动。虽然关于高热冲击引起PFM钨表面开裂、熔蚀以及蒸发等现象也有许多报导，但涉及钨表面热疲劳机理、热疲劳裂纹特点和分布、及其对后续等离子体辐照效应的影响等方面的研究很少。本项目拟利用电子束热疲劳试验系统开展钨表面的热疲劳行为研究，分析钨表面热疲劳裂纹特点及分布规律，探讨热疲劳裂纹形成机制。并进一步开展等离子体辐照实验，了解不同裂纹分布特点对辐照效应的影响情况。

Fusion energy is one of the ideal energy sources for its safety, environment friendship, and almost unexhausted reserves. The problem of anti-radiation of the plasma facing materials (PFM) is one of the unsolved problems to use fusion energy. PFM surface will suffer from the high heat loading and the high irradiation flux of plasma. Tungsten is thought to be the best candidate for PFM. There are large numbers of investigations focused on the relations of anti-radiation properties with the alloying, grain structure and orientation of tungsten. However, the temperatue undulation will exist all the time during a fusion reactor run. It is seldom reported on the mechanism of thermo fatigue, the crack distribution and its influences on the irradiation effects, except some phenomena of heat shock, such as evaporation, melting erosion, and cracking. In the present project, the behaviors of thermo fatigue will be investigated with an E-beam test system of thermo fatigue. The characteristic, distribution and the mechanism of thermo fatigue cracks will be discussed. Further more, the irratiation tests will be carried out for realizing the influeces of crack distribution on the irradiation effects.