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Effect of hot deformation on quenching sensitivity and heterogeneous precipitation behavior of 7150 aluminum alloy

  • Metals & corrosion
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Abstract

This study investigates the influence of hot rolling on the quench sensitivity and heterogeneous precipitation behavior of 7150 aluminum alloy using an end-quenching process combined with conductivity testing, hardness testing, scanning electron microscopy, electron backscatter diffraction, transmission electron microscopy, scanning transmission electron microscopy, and high-resolution transmission electron microscopy. The results reveal that hot rolling significantly increases the quenching sensitivity of the 7150 aluminum alloy, as evidenced by the enhancement in conductivity difference from 0.7 to 1.6% IACS and the rise in hardness drop from 5.5 to 12% at both ends after hot rolling. Microstructural analysis indicates the presence of equiaxed grains with low dislocation density and well-coherent Al3Zr particles in the primitive alloy, with small precipitates of the η phase on the Al3Zr particles. Subsequent to hot rolling, recrystallization occurs, thereby resulting in the generation of numerous high-angle grain boundaries (HAGBs), incoherent Al3Zr particles, dislocations, and coherent Al3Zr particles. Consequently, this leads to increased variety, nucleation sites, sizes, and quantities of heterogeneous precipitates. HAGBs, characterized by high interfacial energy, are found to be the most favorable for the nonuniform nucleation and precipitation of the η phase, followed by low-angle grain boundaries. Significant precipitation of the η and T phases is observed on the noncoherent Al3Zr dispersoids within the recrystallized grains and some subgrains (SGs). Furthermore, the high-dislocation-density SGs not only facilitate the precipitation of the η and T phases but also result in the precipitation of the S and Y phases.

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Acknowledgements

This study was finally supported by the National Natural Science Foundation of China (52205421), Guangxi Science and Technology Major Project (AA23023028), the Key Laboratory Open Project of Guangdong Province (XF20230330-XT), the School-Enterprise, Industry-University-Research Cooperation Project (2023XF-FW-32), and the Science and Technology Innovation Program of Hunan Province, China (2021RC2087, and 2022JJ30570).

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Authors and Affiliations

  1. School of Mechanical Engineering and Mechanics, Xiangtan University, Xiangtan, 411105, China

    Puli Cao, Chengbo Li, Daibo Zhu, Cai Zhao, Bo Xiao & Guilan Xie

  2. Engineering Research Center of the Ministry of Education for Complex Trajectory Processing Technology and Equipment of MoE, Xiangtan, 411105, China

    Puli Cao, Chengbo Li, Daibo Zhu, Cai Zhao, Bo Xiao & Guilan Xie

  3. Guangdong Xing Fa Aluminum Co., Ltd, Foshan, 528137, China

    Chengbo Li

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  1. Puli Cao
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  2. Chengbo Li
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  4. Cai Zhao
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  6. Guilan Xie
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Contributions

CP: Investigation, Visualization and Writing—original draft. LC: Conceptualization and Methodology. ZD: Writing—original draft and Funding Acquisition. ZC and XB: Data curation and Formal analysis. XG: Software and Supervision.

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Correspondence to Chengbo Li or Daibo Zhu.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Cao, P., Li, C., Zhu, D. et al. Effect of hot deformation on quenching sensitivity and heterogeneous precipitation behavior of 7150 aluminum alloy. J Mater Sci 58, 16550–16564 (2023). https://doi.org/10.1007/s10853-023-09089-9

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  • DOI: https://doi.org/10.1007/s10853-023-09089-9

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