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Utilization of Hot Deformation to Trigger Strain-Induced Boundary Migration, Particle-Stimulated Nucleation, and Influence of Nano-Precipitates on Mechanical Properties in High-Alloyed Al–Zn–Mg–Cu Alloys

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Abstract

The second phases, nano-sized precipitates, and mechanical properties of high-alloyed Al–2.9 Mg–10.8Zn–7.55Cu and Al–3.56 Mg–7.69Zn–10.25Cu aluminum (Al) alloys were analyzed using SEM, XRD, DSC, EBSD, TEM, and tensile tests. The second phases of as-cast Z1 and Z2 alloy were mainly Al2Cu and Al2MgCu. After hot deformation, the phases at grain boundary in Z1HR and Z2HR were mainly Al2Cu, Al2MgCu and Mg2Al5Cu6. The nano-precipitates within grain are Al2Cu, Al2MgCu and Mg2Al5Cu6 whose nano-precipitates are different from that in traditional Al alloy and there is a coarsening process of nano-precipitates. The recrystallization nucleation mechanisms of Z1HR and Z2HR Al alloys during hot deformation were strain-induced boundary migration (SIBM) and particle-stimulated nucleation (PSN), which are related to nano-Al2Cu at grain boundaries and intergranular second phases, respectively. The Z1HR Al alloy showed good tensile strengths (\(\sim\) 500 MPa) and ductility \(\sim\) 0.068 after hot deformation. The better tensile properties of Z1HR than Z1, Z2 and Z2HR Al alloys can be ascribed to the precipitation strengthening effect. This study provides insights into novel precipitate structures that can be used in future alloy design.

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Acknowledgements

The authors would like to acknowledge support from National Natural Science Foundation of China (Grant No. 52204381) and National Natural Science Foundation of China (Grant No. 52027805).

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Authors and Affiliations

  1. Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China

    Shang Dai, Mingfan Qi, Weili Yao & Jingyuan Li

  2. School of Materials Science and Engineering, Hubei University of Automotive Technology, Shiyan, 442002, People’s Republic of China

    Luhai Liao

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  1. Shang Dai
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Dai, S., Qi, M., Liao, L. et al. Utilization of Hot Deformation to Trigger Strain-Induced Boundary Migration, Particle-Stimulated Nucleation, and Influence of Nano-Precipitates on Mechanical Properties in High-Alloyed Al–Zn–Mg–Cu Alloys. Met. Mater. Int. (2024). https://doi.org/10.1007/s12540-024-01631-x

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