Abstract
In order to study hydrogen blistering and subsequent cracking behavior of pure W, K-doped W, and La2O3-doped W, 1keV H3+ (main ion components) ion beams were irradiated at 653K to fluences up to 1×1025H/m2. Two pre-irradiation heat treatments were done for stress relief (900°C) and recrystallization (1300°C for pure W and 1500°C for K-doped and La2O3-doped W). It was found that blister characteristics and cracking behavior strongly depended on microstructures and dopant materials. For W materials with layered microstructure, blister shapes were mostly spherical-like, while for W materials with recrystallized (or disordered) microstructures, blisters had complicated plateau-like shapes with many cracks. Addition of K or La2O3 dopants increased the number of blisters and exfoliations for both stress relieved and recrystallized W.
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