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<p>This study investigates the effects of Cu addition on the microstructure and mechanical properties of GH4061. Through systematic examination of Cu diffusion into two alloy variants with different Nb contents, the research reveals that Cu penetration significantly influences precipitate formation and morphology within the alloy matrix. The microstructural analysis demonstrates that elevated Cu concentrations promote the formation of elongated <i>γ</i>″ precipitates alongside conventional spherical <i>γ</i>′ phases, while regions with lower Cu content primarily contain spherical <i>γ</i>′ precipitates. This transformation is attributed to Cu-induced Nb segregation, which creates thermodynamically favorable conditions for <i>γ</i>″ phase nucleation and growth. Mechanical property evaluation through nanoindentation testing reveals a systematic correlation between Cu concentration and hardness reduction, attributed to Cu's inherently lower hardness compared to base alloy constituents and its destabilizing effect on the alloy system through reduced elastic and shear moduli. Although <i>γ</i>″ precipitate formation provides some strengthening contribution in Cu-rich regions, it proves insufficient to counteract the overall softening effect, resulting in progressive hardness reduction with increasing Cu content.</p>

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Cu Effect on the Microstructure and Mechanical Properties in a Wrought Nickel-Based Superalloy

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Jin Huang,
  • Haoyan Meng,
  • Guohua Xu,
  • Shuying Chen,
  • Yueguang Yu

摘要

This study investigates the effects of Cu addition on the microstructure and mechanical properties of GH4061. Through systematic examination of Cu diffusion into two alloy variants with different Nb contents, the research reveals that Cu penetration significantly influences precipitate formation and morphology within the alloy matrix. The microstructural analysis demonstrates that elevated Cu concentrations promote the formation of elongated γ″ precipitates alongside conventional spherical γ′ phases, while regions with lower Cu content primarily contain spherical γ′ precipitates. This transformation is attributed to Cu-induced Nb segregation, which creates thermodynamically favorable conditions for γ″ phase nucleation and growth. Mechanical property evaluation through nanoindentation testing reveals a systematic correlation between Cu concentration and hardness reduction, attributed to Cu's inherently lower hardness compared to base alloy constituents and its destabilizing effect on the alloy system through reduced elastic and shear moduli. Although γ″ precipitate formation provides some strengthening contribution in Cu-rich regions, it proves insufficient to counteract the overall softening effect, resulting in progressive hardness reduction with increasing Cu content.