Radiation-induced nanoparticle growth in 12Cr-ODS steel at elevated temperature
Radiation-induced nanoparticle growth in 12Cr-ODS steel at elevated temperature
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DOI：
10.1016/j.jnucmat.2020.152192
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发表时间：
2020-09
影响因子：
3.1
通讯作者：
Sun-Ryung Oh;S. Kano;Huilong Yang;J. McGrady;H. Abe
中科院分区：
文献类型：
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作者：
Sun-Ryung Oh;S. Kano;Huilong Yang;J. McGrady;H. Abe
利用2 MeV原位超高压透射电子显微镜（UHVTEM）研究了12 Cr-ODS钢中Y-Ti-O纳米颗粒在723 K和823 K温度下的显微结构演变。纳米粒子的尺寸和形状的演变都被跟踪的时间顺序。在总剂量为0.23 dpa的723 K辐照下，发现颗粒总体稳定，但观察到快速的形态变化。而在823 K、总剂量为2.04dpa的辐照下，纳米粒子出现了辐射诱导生长现象，生长后的纳米粒子呈现出独特的形貌变化，最终形状为长方体或五边形。为了进一步理解纳米颗粒不稳定性背后的机制，通过1.25 MeV的原位高分辨率透射电子显微镜（HRTEM），通过快速傅里叶逆变换（IFFT）的时间序列研究了单个纳米颗粒界面处的晶格结构。
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).