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NickelNickel (Ni)-based superalloys are widely used in aerospace due to their exceptional resistance to heat and corrosionCorrosion. However, these properties also pose significant challenges for recyclingRecycling. This study uses liquid metal dealloyingLiquid metal dealloying (LMD) to disrupt the superalloy structure by selectively dissolving Ni from spent Ni-based superalloys using magnesiumMagnesium (Mg). A crucible was designed to facilitate Mg recyclingRecycling. The Ni-based superalloy (GH3128) was treated with varying Mg to superalloy mass ratios. The residual superalloy was separated from reacted Mg via vacuum distillation, achieving Mg regeneration above 90% and Ni extractionNi extraction of 81%. The yield strength of the residual superalloy decreased to 289.6 MPa, accompanied by the formation of a porous structure. Additionally, the LMD process is applicable to other superalloy grades, including Inconel 718 and DD5. The method provides important support for the recyclingRecycling and sustainable developmentDevelopment of Ni resources.

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Liquid Metal Dealloying for Efficient Recycling of Spent Nickel-Based Superalloys and Its Broader Applications

  • 会议论文

  • 发表日期：

    2025年

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  • Hao Li,
  • Dawei Yu,
  • Xueyi Guo,
  • Qinghua Tian

摘要

NickelNickel (Ni)-based superalloys are widely used in aerospace due to their exceptional resistance to heat and corrosionCorrosion. However, these properties also pose significant challenges for recyclingRecycling. This study uses liquid metal dealloyingLiquid metal dealloying (LMD) to disrupt the superalloy structure by selectively dissolving Ni from spent Ni-based superalloys using magnesiumMagnesium (Mg). A crucible was designed to facilitate Mg recyclingRecycling. The Ni-based superalloy (GH3128) was treated with varying Mg to superalloy mass ratios. The residual superalloy was separated from reacted Mg via vacuum distillation, achieving Mg regeneration above 90% and Ni extractionNi extraction of 81%. The yield strength of the residual superalloy decreased to 289.6 MPa, accompanied by the formation of a porous structure. Additionally, the LMD process is applicable to other superalloy grades, including Inconel 718 and DD5. The method provides important support for the recyclingRecycling and sustainable developmentDevelopment of Ni resources.