Jeon Jonggyu, Lee Sangjun, Jeon Jeheon, Kang Maru, Kang Heon
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea.
Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Tokyo 153-8505, Japan.
Materials (Basel). 2024 Dec 3;17(23):5924. doi: 10.3390/ma17235924.
The presence of AlCuFe particles, formed due to Fe impurities in Al-Zn-Mg-Cu alloys, significantly impacts mechanical properties and formability, which is crucial for the use of these alloys in the automotive and aerospace industries. In this study, we prepared Al-Zn-Mg-Cu-based alloy sheets with large (LF), small (SF), and no (NF) AlCuFe particles to explore their effects on recrystallization and mechanical behavior. These sheets were fabricated using controlled cooling rates and subsequent thermo-mechanical processing. Fine dispersion of AlCuFe particles in the SF sheet led to a substantial reduction in grain size (16.5 μm) and an increase in yield strength (168.6 MPa), albeit with lower ductility (24.6%). In contrast, the NF sheet exhibited a lower yield strength (141.5 MPa) but superior ductility (35.8%) due to the absence of AlCuFe particles, which prevented premature fracture. The SF sheet demonstrated lower anisotropy in ductility due to the uniform recrystallized grain orientations, while the LF and NF sheets exhibited significant anisotropy in yield strength. These findings indicate that optimizing AlCuFe particle dispersion is key to balancing the strength, ductility, and anisotropy in Al-Zn-Mg-Cu alloys.
由于铝锌镁铜合金中的铁杂质而形成的AlCuFe颗粒的存在，对机械性能和可成形性有显著影响，这对于这些合金在汽车和航空航天工业中的应用至关重要。在本研究中，我们制备了具有大尺寸（LF）、小尺寸（SF）和无（NF）AlCuFe颗粒的铝锌镁铜基合金板材，以探究它们对再结晶和力学行为的影响。这些板材通过控制冷却速率和随后的热机械加工制成。SF板材中AlCuFe颗粒的精细分散导致晶粒尺寸大幅减小（16.5μm），屈服强度增加（168.6MPa），尽管延展性较低（24.6%）。相比之下，NF板材由于没有AlCuFe颗粒而表现出较低的屈服强度（141.5MPa）但具有优异的延展性（35.8%），这防止了过早断裂。由于再结晶晶粒取向均匀，SF板材在延展性方面表现出较低的各向异性，而LF和NF板材在屈服强度方面表现出显著的各向异性。这些发现表明，优化AlCuFe颗粒的分散是平衡铝锌镁铜合金强度、延展性和各向异性的关键。
