Nuclear Techniques ›› 2014, Vol. 37 ›› Issue (09): 90201-090201.doi: 10.11889/j.0253-3219.2014.hjs.37.090201

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

Influence of irradiation temperature on the surface damage of tungsten

AN Taiyan FAN Hongyu WANG Yan WANG Xiang LI Yue   

  1. (School of Physics and Materials Engineering, Dalian Nationalities University, Dalian 116600, China)
  • Received:2014-05-30 Revised:2014-07-07 Online:2014-09-10 Published:2014-09-09

Abstract: Background: In fusion reactors, W suffers from the displacement damage caused by high energy neutrons, and surface damage, such as blistering, erosion, and sputtering caused by low-energy (tens of eV to several keV) and high-flux (1020?1024 m?2?s?1) helium and hydrogen ions. Purpose: The understanding of the behavior of W materials in fusion environment is a major issue of the material-related stake of fusion reactors. Methods: W samples were irradiated with low-energy (100 eV) and high-flux (6×1020 ions?m?2?s?1) He+ at a sample temperature changing from room temperature to 800 °C to a fluence of 1×1025 ions?m?2. Microscopic evolution of these samples was carried out using scanning electron microscopy (SEM), transmission electron microscopy (TEM), conductive atomic force microscopy (CAFM) and X-ray diffraction (XRD). Results: Analysis indicates that the nanometer-sized fibre-form structure is formed in the surface of W. The spacing and the covering degree of the nanostructure increase with the irradiation temperature. Nanostructure layer may cause the damage of W surface, resulting in surface delocalized, but does not cause a change in the crystal phase of tungsten. Conclusion: Non-destructive conductive atomic force microscopy gives the direct evidence that the forming of the nanometer-sized fibre-form structure is related to the nano-sized He bubbles. This is important for understanding the microstructure formation process of tungsten material.

Key words: Tungsten, Irradiation damage, He bubble