Nanoscale surface morphology of tungsten materials induced by Be-seeded D-He plasma exposure

作者：Tokunaga K^*; Baldwin M J; Doerner R P; Nishijima D; Kurishita H; Fujiwara T; Araki K; Miyamoto Y; Ohno N; Ueda Y

来源：Journal of Nuclear Materials, 2011, 417(1-3): 528-532.

DOI：10.1016/j.jnucmat.2011.01.078

Ultra-fine grain W-(0.5, 1.5)wt%TiC alloys and stress relieved powder metallurgy W have been exposed to D-He mixed plasmas, some with added Be. The fixed exposure conditions are ion energy 60 eV and flux 3 to 6 x 10(22)/m(2) s. Sample temperature is 1123K and exposure times scanned 1000-11,000 s. Typical He/D ion is 0.2 and Be is 0.2% of the plasma. A remarkable change of the tungsten surfaces results from the plasma exposures. Formation of a nano-structured layer on the exposure surfaces is observed and believed to be related to He bubble formation. In addition, the growth rate of the nano-structured layer depends on the microstructure of the samples. In the case of a D-He plasma with Be, at 60 eV, plasma sputters away most of Be deposits with little effect on the He induced nano-structured layer formation.

• 出版日期2011-10-1