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<p>In this study, homogenization followed by solution and aging treatments was applied to Directed Energy Deposition-Arc (DED-Arc) 2319 Al alloy components. The effects of these heat treatments on microstructure evolution, mechanical properties and corrosion resistance were systematically analyzed. A significant number of acicular strengthening phases θ′ (Al<sub>2</sub>Cu) and θ″ (Al<sub>2</sub>Cu) were precipitated after heat treatment. As a result, the hardness increased from 73.9 HV<sub>0.5</sub> (as-deposited state) to 148.0 HV<sub>0.5</sub> in the aged condition, representing an improvement of 100.3%. Similarly, the ultimate tensile strength (UTS) in the longitudinal direction increased from 254.3&#xa0;MPa (as-deposited state) to 371.7&#xa0;MPa (a 46.2% improvement), while the transverse UTS increased from 257.2&#xa0;MPa to 383.1&#xa0;MPa, corresponding to a 48.9% enhancement. Electrochemical and intergranular corrosion (IGC) tests demonstrate that heat treatment significantly improves the corrosion resistance of the alloy. Homogenization eliminates Cu and Mn segregation and dissolves eutectic phases, solution treatment reduces pitting sites, and aging promotes the precipitation of fine θ′/θ″ strengthening phases. These combined effects suppress exfoliation corrosion through microstructural homogenization, thereby enhancing the long-term service stability of the alloy in corrosive environments.</p>

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Effect of heat treatment on mechanical properties and corrosion resistance of Directed Energy Deposition-Arc 2319 Al alloy

  • 期刊论文

  • 发表日期：

    2026年4月16日

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  • Fenglei Cao,
  • Aiping Liu,
  • Dianlong Wang,
  • Zhen Tan,
  • Liwei Wang,
  • Zhimin Liang,
  • Shaohui Chen,
  • Changjiang Tian,
  • Yunfeng Yao,
  • Balaji Narayanaswamy

摘要

In this study, homogenization followed by solution and aging treatments was applied to Directed Energy Deposition-Arc (DED-Arc) 2319 Al alloy components. The effects of these heat treatments on microstructure evolution, mechanical properties and corrosion resistance were systematically analyzed. A significant number of acicular strengthening phases θ′ (Al2Cu) and θ″ (Al2Cu) were precipitated after heat treatment. As a result, the hardness increased from 73.9 HV0.5 (as-deposited state) to 148.0 HV0.5 in the aged condition, representing an improvement of 100.3%. Similarly, the ultimate tensile strength (UTS) in the longitudinal direction increased from 254.3 MPa (as-deposited state) to 371.7 MPa (a 46.2% improvement), while the transverse UTS increased from 257.2 MPa to 383.1 MPa, corresponding to a 48.9% enhancement. Electrochemical and intergranular corrosion (IGC) tests demonstrate that heat treatment significantly improves the corrosion resistance of the alloy. Homogenization eliminates Cu and Mn segregation and dissolves eutectic phases, solution treatment reduces pitting sites, and aging promotes the precipitation of fine θ′/θ″ strengthening phases. These combined effects suppress exfoliation corrosion through microstructural homogenization, thereby enhancing the long-term service stability of the alloy in corrosive environments.