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<p>In this study, a new solid-state additive manufacturing process, rolling friction deposition additive (AFRD), was used to achieve the additive manufacturing of 2024-O aluminium alloy. The results show that the main mechanism of AFRD dynamic recrystallization is continuous dynamic recrystallization (CDRX), and the specimens show a gradient fine crystalline organization, with the grain size distribution concentrated in the range of 4–7 µm (with the smallest average grain size of 1.8 µm), and the second-phase particles of the deposited layer are fragmented and refined and dispersed in the aluminum matrix. In terms of mechanical properties, the average hardness of the deposited layer is about 38.39 HV, which is uniformly distributed in the width direction and shows a gradient increase in the height direction. The strength and plasticity of the additive specimens are better than that of the 2024-O raw material parent material, up to 165.6 MPa and 16.2 %, respectively, with excellent strength and toughness matching.</p>

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Revealing the microstructural evolution and organizational characteristics of aluminum alloy rolling friction deposition additions

  • 期刊论文

  • 发表日期：

    2025年5月6日

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  • Hai Zhu,
  • Tao Zeng,
  • Yanfeng Li,
  • Qing Dong,
  • Yujia Liu,
  • Xiaolong Yan

摘要

In this study, a new solid-state additive manufacturing process, rolling friction deposition additive (AFRD), was used to achieve the additive manufacturing of 2024-O aluminium alloy. The results show that the main mechanism of AFRD dynamic recrystallization is continuous dynamic recrystallization (CDRX), and the specimens show a gradient fine crystalline organization, with the grain size distribution concentrated in the range of 4–7 µm (with the smallest average grain size of 1.8 µm), and the second-phase particles of the deposited layer are fragmented and refined and dispersed in the aluminum matrix. In terms of mechanical properties, the average hardness of the deposited layer is about 38.39 HV, which is uniformly distributed in the width direction and shows a gradient increase in the height direction. The strength and plasticity of the additive specimens are better than that of the 2024-O raw material parent material, up to 165.6 MPa and 16.2 %, respectively, with excellent strength and toughness matching.