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Relationship Between the Strengthening Effect and the Morphology of Precipitates in Al–7.4Zn–1.7Mg–2.0Cu Alloy

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The morphological evolution of the precipitates in Al–7.4Zn–1.7Mg–2.0Cu (wt%) alloy was studied by high-resolution transmission electron microscopy (HRTEM). Statistics reveal that the hardness of the alloy changes accordingly with the change of the average thickness–diameter ratio of precipitates. The GPII zones are mainly responsible for the first and also the highest hardness peak. They grow in diameter and keep 7-atomic-layer in thickness. Once the thickness changes, the phase transformation from GPII zone to η′ or η-precursor would occur. The resultant metastable η′ and η-precursor precipitates grow in both diameter and thickness, but much faster in the former. After the first hardness peak, the metastable η′ precipitates and η-precursor, coexisting with part of GPII zones, are counted as the main hardening precipitates.

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Acknowledgments

This work was financially supported by the National Basic Research Program of China (No. 2009CB623704), the National Natural Science Foundation of China (Nos. 51171063, 10904034, 51071064 and 51301064), Instrumental Innovation Foundation of Hunan Province (No. 2011TT1003), the Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province and the Aid Program for Young Teachers (No. 531107040548).

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Authors and Affiliations

  1. College of Materials Science & Engineering, Hunan University, Changsha, 410082, China

    Xiubo Yang, Jizi Liu, Jianghua Chen, Caiyun Wan, Lei Fang, Ping Liu & Cuilan Wu

  2. Hunan Province Key Laboratory for Spray Deposition Technology and Application, Hunan University, Changsha, 410082, China

    Jizi Liu, Jianghua Chen & Cuilan Wu

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  1. Xiubo Yang
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  2. Jizi Liu
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  7. Cuilan Wu
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Correspondence to Jizi Liu.

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Yang, X., Liu, J., Chen, J. et al. Relationship Between the Strengthening Effect and the Morphology of Precipitates in Al–7.4Zn–1.7Mg–2.0Cu Alloy. Acta Metall. Sin. (Engl. Lett.) 27, 1070–1077 (2014). https://doi.org/10.1007/s40195-014-0122-7

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  • DOI: https://doi.org/10.1007/s40195-014-0122-7

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