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 Improved three-dimensional atom probe tomography procedures for analyzing irradiation-induced microstructures
Tác giả hoặc Nhóm tác giả: Ba Vu Chinh Nguyen, Kenta Murakami, Chen Liang, Phongsakorn Prak Tom, Chen Xinrun
Nơi đăng: E-Journal of Advanced Maintenance; Số: 14;Từ->đến trang: 01-11;Năm: 2022
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
ABSTRACT
Three-dimensional atom probe tomography (APT) is an excellent technique for identifying nanometer-sized solute atom enrichment regions, but the relationship between these nano-features and crystal orientation has not been well analyzed, except for in some semiconductor materials. In this study, a method that combines crystal orientation analysis of field desorption map and geometrical calculations to improve the reconstruction parameters for APT analysis was applied. Spherical Cu-rich clusters and planar Mn and Ni segregations on dislocation loops in Fe model alloys after ion irradiation were used as indicators for this analysis. The matrix atoms were well reconstructed. In addition, Cu-enriched regions formed as discrete clusters, while Mn- and Nienriched regions tended to be connected as part of a torus. The Cu-rich clusters had an oval shape with the smaller dimension along the z-axis, which may be due to the difference in the field evaporation between Cu(I) and Fe(II). The orientations of some Mn and Ni segregations were found by analyzing the desorption images, proving the decoration on the edge of dislocation loops. The distribution of solute atoms in the iron lattice was consistent with previous studies, confirming the correctness of this method for analyzing minority elements distributed in metal alloys.
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