Neutron Endurance of the Al2O3 on the SS316L
International Conference on Advanced Materials and Devices, Jeju, Korea (2021)
Hyun Seo Yang. Sang-hwa Lee, Young-ku Jin, Jooohwan Ha, Dongpyo Hong, Ok Sung Jeon, Tae Han Kim, Yong Yeol Park, Dong min Kim and Young Joon Yoo, Sang Yoon Park
Abstract
ITER (International Thermonuclear Experimental Reactor) components are facing the defects of materials by neutron irradiation and hydrogen isotope permeation. The hydrogen isotopes, which are deuterium (2H) and tritium (3H), are the most promising fusion fuel and dissolve and penetrate most metals, causing embrittlement, destroying materials. The TBM (Test Blanket Module) is attached for the reproduction of tritium by 6Li(n,α)3H reaction, and constructed by RAFM (Reduced-Activation Ferritic/Martensitic) steel, which is for the low activation.
The Al2O3 (Alumina), reinforcement has compressive strength, wear resistance, chemical stability, and low solubility for hydrogen. These properties revealed that the Al2O3 is suitable as a hydrogen permeation barrier to improve the PRF (Permeation Reduction Factor). As following the first-principle calculation, the point defects in Al2O3 are performing as a hydrogen trapping factor, while varying the PRF.
It is necessary to quantify the neutron irradiation damage of the Al2O3 and RAFM steel. We calculated displacement per atom and strain by neutron collision heating to evaluate the strain due to the difference of the thermal expansion coefficient of Al2O3 and RAFM steel.</p>