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<p>The presence of topologically close-packed (TCP) phases is known to deteriorate the mechanical properties of Ni-based single crystal (SX) superalloy, which not only depletes the strengthening refractory elements from the γ' phase, but also contributes to the material failure due to the weak TCP/matrix interface. This study explores the interface between σ and γ' in a creep-fractured Ni-based single crystal superalloy, with a specific focus on the atomic interfacial structures and Co segregation. The σ phase was observed to be orientated with γ' as both [110]<sub>σ</sub>//[110]<sub>γ'</sub> and [4<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\overline{\text{1}}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mtext>1</mtext> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation>0]<sub>σ</sub>//[011]<sub>γ'</sub>, but always possess a habit plane of (001)<sub>σ</sub>//(1<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({\overline{\text{1}}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mover> <mtext>1</mtext> <mo>¯</mo> </mover> </math></EquationSource> </InlineEquation>1)<sub>γ'</sub>. Furthermore, significant Co segregation occurred between the σ and γ', leading to the reinforced interfacial strength. Theoretical calculation indicates that the enhanced interfacial strength can be attributed to the accumulated charge density across the σ/γ interface with the Co segregation. These findings provide insight into the TCP/matrix interface and the role of interfacial solute segregation, which would benefit the design of Ni-based SX superalloys.</p>

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Characterization of σ/Matrix Interface in Ni-Based Single Crystal Superalloys

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • Lingyi Kong,
  • Xingpu Zhang,
  • Pengfei Yue,
  • Wanshun Xia,
  • Zhe Hong,
  • Xinbao Zhao,
  • Jiangwei Wang,
  • Ze Zhang

摘要

The presence of topologically close-packed (TCP) phases is known to deteriorate the mechanical properties of Ni-based single crystal (SX) superalloy, which not only depletes the strengthening refractory elements from the γ' phase, but also contributes to the material failure due to the weak TCP/matrix interface. This study explores the interface between σ and γ' in a creep-fractured Ni-based single crystal superalloy, with a specific focus on the atomic interfacial structures and Co segregation. The σ phase was observed to be orientated with γ' as both [110]σ//[110]γ' and [4 \({\overline{\text{1}}}\) 1 ¯ 0]σ//[011]γ', but always possess a habit plane of (001)σ//(1 \({\overline{\text{1}}}\) 1 ¯ 1)γ'. Furthermore, significant Co segregation occurred between the σ and γ', leading to the reinforced interfacial strength. Theoretical calculation indicates that the enhanced interfacial strength can be attributed to the accumulated charge density across the σ/γ interface with the Co segregation. These findings provide insight into the TCP/matrix interface and the role of interfacial solute segregation, which would benefit the design of Ni-based SX superalloys.