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In Situ HRTEM Observation of Electron-Irradiation-Induced Amorphization and Dissolution of the E (Al18Cr2Mg3) Phase in 7475 Al Alloy

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Electron irradiation effects on phase stability of the E (Al18Cr2Mg3) phase have been investigated by high-angle annular dark-field scanning transmission electron microscopy and high-resolution transmission electron microscopy (HRTEM). The in situ HRTEM observations show that the Al18Cr2Mg3 particles with different thickness undergo amorphization and dissolution under 300 keV electron irradiation at 25 °C. The results indicate that the intermetallic compound Al18Cr2Mg3 is unstable under electron irradiation, and structural changes mainly depend on the thickness of particles. Amorphization in the thick particles is caused by a combination of chemical disordering and an increase in point defect concentration. Dissolution after amorphization in the thin particles is attributed to the diffusion of point defect towards the Al matrix.

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Acknowledgments

The work was financially supported by the 111 Project (No. B08040) of China and National Natural Science Foundation of China (No. 51071125).

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, 710072, China

    Mao-Hua Li, Yan-Qing Yang, Bin Huang, Xian Luo, Wei Zhang, Yan-Xia Chen & Ming Han

  2. Beijing Institute of Aeronautical Materials, Beijing, 100095, China

    Ji-Gang Ru

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  1. Mao-Hua Li
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  2. Yan-Qing Yang
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  3. Bin Huang
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  4. Xian Luo
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  5. Wei Zhang
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  7. Ming Han
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Correspondence to Mao-Hua Li.

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Li, MH., Yang, YQ., Huang, B. et al. In Situ HRTEM Observation of Electron-Irradiation-Induced Amorphization and Dissolution of the E (Al18Cr2Mg3) Phase in 7475 Al Alloy. Acta Metall. Sin. (Engl. Lett.) 28, 147–151 (2015). https://doi.org/10.1007/s40195-014-0176-6

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  • DOI: https://doi.org/10.1007/s40195-014-0176-6

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