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<p>Developing high-performance aluminum (Al) alloy sheets has become an urgent issue for their extensive application in the field of transportation. In this study, a new Al–Mg–Si–Cu–Zn–Fe–Mn alloy with excellent mechanical properties was prepared by a novel short-flow thermomechanical route. Heterogeneous structure, including a microstructure with soft microdomain surrounding hard microdomain (specimen HS-0) and another microstructure with hard microdomain surrounding soft microdomain (specimen HS-10) were constructed by the short-flow thermomechanical processing routes. More importantly, both the high strength and ductility of hetero-structured specimens are attributed primarily to heterogeneous deformation induce (HDI) stress hardening. Moreover, the corrosion results indicated that the heterogeneous structures exhibit superior corrosion resistance compared to the uniform structure, and the specimen HS-0 exhibits the best corrosion resistance in this work. This current study provides a new short-flow thermomechanical process for the construction of soft/hard microdomain heterostructure, offering valuable insights into the promotion of Al alloys with enhanced strengths, ductility and corrosion resistance.</p>

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Effect of structure characteristics on age hardening response, strength, ductility and corrosion resistance of Al–Mg–Si–Cu–Zn–Fe–Mn alloy

  • 期刊论文

  • 发表日期：

    2025年5月24日

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  • Xiangyang Chen,
  • Mingxing Guo,
  • Ziteng Peng,
  • Jinqing Du,
  • Jinming Zhi,
  • Tongbo Wang,
  • Wei Zhou,
  • Huafen Lou

摘要

Developing high-performance aluminum (Al) alloy sheets has become an urgent issue for their extensive application in the field of transportation. In this study, a new Al–Mg–Si–Cu–Zn–Fe–Mn alloy with excellent mechanical properties was prepared by a novel short-flow thermomechanical route. Heterogeneous structure, including a microstructure with soft microdomain surrounding hard microdomain (specimen HS-0) and another microstructure with hard microdomain surrounding soft microdomain (specimen HS-10) were constructed by the short-flow thermomechanical processing routes. More importantly, both the high strength and ductility of hetero-structured specimens are attributed primarily to heterogeneous deformation induce (HDI) stress hardening. Moreover, the corrosion results indicated that the heterogeneous structures exhibit superior corrosion resistance compared to the uniform structure, and the specimen HS-0 exhibits the best corrosion resistance in this work. This current study provides a new short-flow thermomechanical process for the construction of soft/hard microdomain heterostructure, offering valuable insights into the promotion of Al alloys with enhanced strengths, ductility and corrosion resistance.