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Effect of pre-recovery on microstructure and properties of rolled Al-12.18Zn-3.31Mg-1.43Cu-0.20Zr-0.04Sr aluminum alloy

  • Cheng-bin Cai
  • Xiao-jing XuEmail author
  • Jin-dong Huang
  • Shi-hao Ju
  • Qing Ding
  • Cheng-song Wang
Article

Abstract

The independently designed and manufactured ultra-high-strength aluminum alloy Al-12.18Zn-3.31Mg-1.43Cu-0.20Zr-0.04Sr was investigated via scanning electron microscopy observations, X-ray diffraction analysis, hardness tests, electrical conductivity tests, tensile tests, intergranular corrosion tests, and exfoliation corrosion tests. The effect of pre-recovery on the microstructure and mechanical properties of this aluminum alloy was also studied. The results show that the pre-recovery heat treatment releases deformation energy, inhibits recrystallization, and decreases the dislocation density. Although the pre-recovery heat treatment has little effect on the hardness, electrical conductivity, and elongation of this aluminum alloy, it can dramatically improve the alloy’s tensile strength (the maximum tensile strength increased from 785.0 MPa to 809.2 MPa). Moreover, the tensile properties of this aluminum alloy have a certain degree of isotropy, and the pre-recovery heat treatment does not affect this property. In addition, the rolled aluminum alloy exhibits good corrosion resistance, but the effect of the pre-recovery heat treatment on the alloy’s resistance to intergranular and exfoliation corrosion is negligible.

Keywords

ultra-high strength aluminum alloy pre-recovery microstructure mechanical property corrosion resistance 

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Notes

Acknowledgements

This work was financially supported by the Jiangsu Provincial Industrial Science and Technology Support Program (No. BE2008118) and the Basic Research on Isotropic Ultra- high Strength Aluminum Matrix Composite (No. 6140922010201).

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Copyright information

© University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Cheng-bin Cai
    • 1
  • Xiao-jing Xu
    • 1
    Email author
  • Jin-dong Huang
    • 1
  • Shi-hao Ju
    • 1
  • Qing Ding
    • 1
  • Cheng-song Wang
    • 1
  1. 1.Engineering Institute of Advanced Manufacturing and Modern Equipment TechnologyJiangsu UniversityZhenjiangChina

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