Abstract
Al-based composites containing high neutron absorption cross-section elements are the most promising shielding materials for spent fuel storage, but their irradiation performance is the key to their long-term service stability. In the present work, an in-situ study on the evolution and characteristics of irradiation defect clusters including dislocation loops, gas bubbles and hydrogen platelets in Al-based Gd2O3–W composites during 30 keV H2+ irradiation is carried out using a transmission electron microscope and analyzed in detail. The delamination of bubbles and the formation of a tunnel structure in the Al matrix are found for the first time. Hydrogen platelets in Al5W particles are first observed, and their formation and evolution and corresponding mechanism are investigated in detail. Platelets with different orientations have different growth rates, and the relationship between growth rate and dose is constructed. In addition, the irradiation-induced increase in yield strength in Al the matrix is estimated. This study provides new insights for the design and development of new Al-based rare earth composites with high resistance to irradiation damage.
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