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Abstract <p>A series of long-term strength tests were conducted on [001] single crystals of an experimental nickel-based rhenium-ruthenium superalloy of the sixth generation. The tests were conducted at temperatures of 1100, 1150 and 1200°C for durations of up to ~1100 h. The long-term strength of the alloy at these temperatures is determined by the volume fractions of lamellar particles of γ'-phase and topologically close packed (TCP) phase in the raft structure of the alloy. The mechanism of TCP phase formation in the alloy has been established and identified as δ-phase based on rhenium and ruthenium with a HCP crystal lattice with the parameters <i>а</i> = <i>b</i> = 0.273 nm, <i>c</i> = 0.432 nm and [110]<sub>γ</sub> || [1<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11508_2025_4366_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="10" /> </InlineMediaObject> <EquationSource Format="TEX">\(\bar {2}\)</EquationSource> <!--PhysMet2460259Svetlov-m1--> </InlineEquation>10]<sub>δ</sub>, and (<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11508_2025_4366_Article_IEq2.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="10" /> </InlineMediaObject> <EquationSource Format="TEX">\(\bar {1}\)</EquationSource> <!--PhysMet2460259Svetlov-m2--> </InlineEquation>1<InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11508_2025_4366_Article_IEq2.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="10" /> </InlineMediaObject> <EquationSource Format="TEX">\(\bar {1}\)</EquationSource> <!--PhysMet2460259Svetlov-m3--> </InlineEquation>)<sub>γ</sub> || (0001)<sub>δ</sub> orientation relationships.</p>

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Evolution of Microstructure and Phase Composition of Single Crystals of Nickel-Based Superalloy in the Process of High-Temperature Creep

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • I. L. Svetlov,
  • N. V. Petrushin,
  • D. V. Zaitsev,
  • A. I. Epishin,
  • E. S. Elyutin,
  • A. N. Raevskikh

摘要

Abstract

A series of long-term strength tests were conducted on [001] single crystals of an experimental nickel-based rhenium-ruthenium superalloy of the sixth generation. The tests were conducted at temperatures of 1100, 1150 and 1200°C for durations of up to ~1100 h. The long-term strength of the alloy at these temperatures is determined by the volume fractions of lamellar particles of γ'-phase and topologically close packed (TCP) phase in the raft structure of the alloy. The mechanism of TCP phase formation in the alloy has been established and identified as δ-phase based on rhenium and ruthenium with a HCP crystal lattice with the parameters а = b = 0.273 nm, c = 0.432 nm and [110]γ || [1 \(\bar {2}\) 10]δ, and ( \(\bar {1}\) 1 \(\bar {1}\) )γ || (0001)δ orientation relationships.