XAFS and SRGI-XRD studies of the local structure of tellurium corrosion of Ni–18%Cr alloy

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英文篇名：XAFS and SRGI-XRD studies of the local structure of tellurium corrosion of Ni–18%Cr alloy 作者：Mi ; Luo ; Sheng-Jue ; Deng ; Li ; Li ; Fei ; Song ; Li-Hua ; Wang ; Zhi-Jun ; Li ; Zheng ; Jiang 英文作者：Mi Luo;Sheng-Jue Deng;Li Li;Fei Song;Li-Hua Wang;Zhi-Jun Li;Zheng Jiang;Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences;University of Chinese Academy of Sciences;State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, Department of Materials Science and Engineering, Zhejiang University;Shanghai Advanced Research Institute, Chinese Academy of Sciences;Center for Thorium Molten Salts Reactor System, Shanghai Institute of Applied Physics, Chinese Academy of Sciences; 英文关键词：Ni–Cr alloy;;X-ray absorption spectroscopy(XAS);;High-temperature diffusion;;Gibbs free energy;;Solid solution 中文刊名：Nuclear Science and Techniques 英文刊名：核技术(英文版) 机构：Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences;University of Chinese Academy of Sciences;State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, Department of Materials Science and Engineering, Zhejiang University;Shanghai Advanced Research Institute, Chinese Academy of Sciences;Center for Thorium Molten Salts Reactor System, Shanghai Institute of Applied Physics, Chinese Academy of Sciences; 出版日期：2019-10-15 出版单位：Nuclear Science and Techniques 年：2019 期：10 基金：supported by the National Key Research and Development Program of China(No.2016YFB0700404);; National Natural Science Foundation of China(No.U1732267);National Natural Science Foundation of China(Nos.51671122 and 51671154);; Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA02004210);; Talent Development Fund of Shanghai(No.201650) 语种：英文; 页：15-25 页数：11 CN：31-1559/TL ISSN：1001-8042 分类号：TL426;TL341

摘要

The speciation and atomic structures of corrosion products in Ni-based alloys could provide basic information for understanding the Te corrosion mechanism. In this paper, two-dimensional synchrotron-radiation-induced grazing incidence X-ray diffraction was used to characterize the corrosion products of a Ni–18%Cr binary alloy at temperatures from 600 to 1000℃. The results showed that a film of Cr Te is preferentially formed when Te reacts with the Ni-based alloy at low temperatures(below 900℃), while Cr Te and Ni_3Te_2 are formed at 900℃. Moreover, at a temperature of 1000℃, a solid solution is formed without any changes in the Ni–Cr substrate lattice parameters. Furthermore, X-ray absorption fine structure and wavelet transform analyses were used toinvestigate the atomic local structure of Te. The investigation indicated that Te atoms diffuse into the Ni–Cr substrate to form a substitutional Ni–Cr–Te solid solution at 1000℃. Notably, based on a discussion of the thermodynamics of the chemical reaction process, Cr Te is considered to be the most stable and prevalent corrosion product due to its comparatively lower Gibbs free energy of formation. These results demonstrate that the Ni–18%Cr alloy is capable of resisting the diffusion of Te atoms.
        The speciation and atomic structures of corrosion products in Ni-based alloys could provide basic information for understanding the Te corrosion mechanism. In this paper, two-dimensional synchrotron-radiation-induced grazing incidence X-ray diffraction was used to characterize the corrosion products of a Ni–18%Cr binary alloy at temperatures from 600 to 1000℃. The results showed that a film of Cr Te is preferentially formed when Te reacts with the Ni-based alloy at low temperatures(below 900℃), while Cr Te and Ni_3Te_2 are formed at 900℃. Moreover, at a temperature of 1000℃, a solid solution is formed without any changes in the Ni–Cr substrate lattice parameters. Furthermore, X-ray absorption fine structure and wavelet transform analyses were used toinvestigate the atomic local structure of Te. The investigation indicated that Te atoms diffuse into the Ni–Cr substrate to form a substitutional Ni–Cr–Te solid solution at 1000℃. Notably, based on a discussion of the thermodynamics of the chemical reaction process, Cr Te is considered to be the most stable and prevalent corrosion product due to its comparatively lower Gibbs free energy of formation. These results demonstrate that the Ni–18%Cr alloy is capable of resisting the diffusion of Te atoms.

引文

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