Schematic illustrations of defects generation and accumulation driven by atomic size difference (δ) of V-based alloys during ab/desorption cycles. (IMAGE)
Caption
A two-stage defect evolution occurred in hydrogen sorption cycles, associated with the generation of two types of nano-scale hierarchical structures. At 1st cycle, nanograins with different spatial orientations show up, which geometrically leads to the formation of dislocations between the misoriented interfaces. In subsequent cycles, alternating nano-layered structures (1 – 2 nm thickness) gradually appear within the nanograins, resulting in the formation of subgrain boundaries accompanied with the local distortion and strains.
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Nano research, Tsinghua University Press
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