Surface Damage and Microstructure Evolution of Yttria Particle-Reinforced Tungsten Plate during Transient Laser Thermal Shock

Tungsten and its alloys are considered to be the most nominated plasma-facing materials in fusion reactors, which will exposed enormously rigorous conditions such as thermal load, plasma exposure, neutron radiation. At present, research on behavior of oxide particle-reinforced tungsten-based under long-term steady-state heat load transient shock is insufficient. The purpose this study investigate performance yttria tungsten plates prepared by wet chemical method loads means indirect coupling experiments. An Nd:YAG laser device used perform events. surface damage microstructure evolution rolled fully recrystallized samples observed analyzed. cracking threshold about 0.40~0.48 GW/m2; degree them aggravates with increased power density. What more, cracks or even melting could accelerated process recrystallization, resulting degradation ability withstand material.