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Microstructure Evolution of High-Alloyed Al–Zn–Mg–Cu–Zr Alloy Containing Trace Amount of Sc During Homogenization

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Abstract

Microstructure evolution of a new high-alloyed Al–Zn–Mg–Cu–Zr–Sc aluminium alloy during two-stage homogenization process was investigated by use of scanning electron microscope, transition electron microscope and high resolution transition electron microscope. The results indicate that the morphology and chemical composition of Al3(Sc, Zr) particles formed in the first stage were greatly affected by heating temperature. With the increase of heating temperature, the morphology of Al3(Sc, Zr) particles transform from cuboidal with evident faceting to spheroidal due to improved Zr diffusivity. More Zr atoms enrich in the interface of precipitate/matrix forming a thin layer. Moreover, the mean diameter of precipitates increases a little bit with the increase of heating temperature, showing very restricted coarsening rate and high thermal stability of Al3(Sc, Zr) particles. After an appropriate second stage heat treatment (474 °C × 48 h), the intermetallic formed in the solidification process could dissolve sufficiently and Al3(Sc, Zr) particles still keep very good coherency with Al matrix without abnormal growth.

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Acknowledgements

This study was financially supported by the National Key R&D Program of China (No. 2016YFB0300903), and National Key Basic Research Program of China (973 Program, No.2012CB723900).

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Authors and Affiliations

  1. State Key Laboratory of Non-ferrous Metals and Processes, General Research Institute for Nonferrous Metals, Beijing, 100088, People’s Republic of China

    Yu Wang, Zhihui Li, Baiqing Xiong, Kai Wen, Shuhui Huang, Xiwu Li & Yongan Zhang

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  1. Yu Wang
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  2. Zhihui Li
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Correspondence to Baiqing Xiong.

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Wang, Y., Li, Z., Xiong, B. et al. Microstructure Evolution of High-Alloyed Al–Zn–Mg–Cu–Zr Alloy Containing Trace Amount of Sc During Homogenization. Met. Mater. Int. 25, 697–704 (2019). https://doi.org/10.1007/s12540-018-00210-1

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