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Article

The Formation Mechanism of a Self-Organized Periodic-Layered Structure at the Solid-(Cr, Fe)2B/Liquid-Al Interface

by 1,2, 1,2, 1,2, 1,2, 1,2, 1,2,* and 1,2,*
1
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2
Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(17), 3869; https://doi.org/10.3390/ma13173869
Received: 9 July 2020 / Revised: 26 August 2020 / Accepted: 28 August 2020 / Published: 2 September 2020
(This article belongs to the Section Corrosion)
A periodic-layered structure was observed in solid-(Cr, Fe)2B/liquid-Al diffusion couple at 750 °C. The interface morphology, the reaction products, and the potential formation mechanism of this periodic-layered structure were investigated using an electron probe microanalyzer (EPMA), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and energy-dispersive spectroscopy (EDS). The results indicate that the reaction between (Cr, Fe)2B and liquid Al is a diffusion-controlled process. The formation of intermetallics involves both the superficial dissolution of Fe and Cr atoms and the inward diffusion of Al at the interface. The layered structure, as characterized by various experimental techniques, is alternated by a single FeAl3 layer and a (FeAl3 + Cr3AlB4) dual-phase layer. A potential mechanism describing the formation process of this periodic-layered structure was proposed based on the diffusion kinetics based on the experimental results. View Full-Text
Keywords: periodic-layered structure; self-assembly; interface diffusion; phase transformations; focused ion beam periodic-layered structure; self-assembly; interface diffusion; phase transformations; focused ion beam
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MDPI and ACS Style

Wang, M.; Ju, J.; Li, J.; Zhou, Y.; Lv, H.; Gao, H.; Wang, J. The Formation Mechanism of a Self-Organized Periodic-Layered Structure at the Solid-(Cr, Fe)2B/Liquid-Al Interface. Materials 2020, 13, 3869. https://doi.org/10.3390/ma13173869

AMA Style

Wang M, Ju J, Li J, Zhou Y, Lv H, Gao H, Wang J. The Formation Mechanism of a Self-Organized Periodic-Layered Structure at the Solid-(Cr, Fe)2B/Liquid-Al Interface. Materials. 2020; 13(17):3869. https://doi.org/10.3390/ma13173869

Chicago/Turabian Style

Wang, Mengmeng, Jiang Ju, Jingjing Li, Yang Zhou, Haiyang Lv, Haiyan Gao, and Jun Wang. 2020. "The Formation Mechanism of a Self-Organized Periodic-Layered Structure at the Solid-(Cr, Fe)2B/Liquid-Al Interface" Materials 13, no. 17: 3869. https://doi.org/10.3390/ma13173869

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