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<p>The novel hot forming process composed of hot form and quench (HFQ) and electric pulse treatment (EPT) was proposed to enhance the mechanical properties for Al-Zn-Mg-Cu alloy. The results show that, the increased current density enhances collisions with atoms, raising their energy and promoting atomic diffusion, thus inducing the increment of the quantity and size for η´ and η phase. The high strength for HFQ + EPT/75 sample was obtained with the value of 622&#xa0;MPa (UTS) and 545&#xa0;MPa (YS), and exhibiting the excellent performance (i.e. The product of strength and plasticity: 8210.4&#xa0;MPa%). Additionally, EPT enables to decrease the nucleation of energy barrier of recrystallization. As the current density increased, high fraction of fine recrystallized grains were observed for the HFQ + EPT/100 sample due to the massive joule heating generated from EPT. The recrystallization mechanism transferred from geometric dynamic recrystallization (GDRX) to continuous dynamic recrystallization (CDRX) + discontinuous dynamic recrystallization (DDRX) to DDRX. And GDRX, CDRX and DDRX mainly rely on grain boundary migration (GBM) + sub-grain rotation (SGR), SGR and GBM, respectively.</p>

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Microstructure and Mechanical Properties of Al-Zn-Mg-Cu Alloy Prepared by Electric-Pulse-Assisted Hot Form and Quench Process

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Junyan Yang,
  • Xinglei Zhang,
  • Lincai Zhang,
  • Hongjie Fang,
  • Shihui You,
  • Haibo Liu

摘要

The novel hot forming process composed of hot form and quench (HFQ) and electric pulse treatment (EPT) was proposed to enhance the mechanical properties for Al-Zn-Mg-Cu alloy. The results show that, the increased current density enhances collisions with atoms, raising their energy and promoting atomic diffusion, thus inducing the increment of the quantity and size for η´ and η phase. The high strength for HFQ + EPT/75 sample was obtained with the value of 622 MPa (UTS) and 545 MPa (YS), and exhibiting the excellent performance (i.e. The product of strength and plasticity: 8210.4 MPa%). Additionally, EPT enables to decrease the nucleation of energy barrier of recrystallization. As the current density increased, high fraction of fine recrystallized grains were observed for the HFQ + EPT/100 sample due to the massive joule heating generated from EPT. The recrystallization mechanism transferred from geometric dynamic recrystallization (GDRX) to continuous dynamic recrystallization (CDRX) + discontinuous dynamic recrystallization (DDRX) to DDRX. And GDRX, CDRX and DDRX mainly rely on grain boundary migration (GBM) + sub-grain rotation (SGR), SGR and GBM, respectively.