Abstract
The microstructural evolutions of Y-Ti-O nanoparticles in 12Cr-ODS steel under 2 MeV in-situ ultra-high voltage transmission electron microscope (UHVTEM) were investigated at 723K and 823K. Both the size and shape evolutions of nanoparticle were tracked time-sequentially. Under the 723K irradiation with a total dose of 0.23 dpa, the overall particle stability was found while rapid morphological changes were observed. However, under the 823K irradiation with a total dose of 2.04 dpa, the radiation-induced growth was found. Upon the growth phenomena, the growing nanoparticles presented the unique morphological transformation of the final shape being cuboid or five-sided polygons. To further understand the mechanism behind the instability of nanoparticles, through 1.25 MeV in-situ high resolution transmission electron microscope (HRTEM), the lattice structure at the interface of a single nanoparticle was investigated time-sequentially by inverse fast Fourier transformation (IFFT).
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