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<p>This study re-examines the coarsening behavior of γ′ precipitates in Ni–8.5Al–10Cr alloys with 2 at % W, Re, or Ru additions at 800&#xa0;°C using Lifshitz-Slyozov-Wagner (LSW) and trans-interface diffusion-controlled (TIDC) models. Temporal evolution of precipitate size, solute partitioning, volume fraction, and number density revealed that W, Re, and Ru reduced coarsening rates, with Re exhibiting the strongest effect due to suppressed matrix-diffusivity and interfacial energy reduction. Ru induced reversed Al/Cr partitioning in the γ matrix, while Re and Ru preferentially segregated to the γ matrix, contrasting W’s affinity for γ′ precipitate. First-principles calculations and CALPHAD simulations corroborated experimental trends, highlighting elemental site preferences at γ′ precipitate. Both models demonstrated comparable reliability, with TC-PRISMA simulations aligning well with experimental data. Results underscore the critical role of refractory elements in tailoring coarsening mechanisms via diffusion kinetics and interfacial energy modulation, offering insights for alloy design.</p> Graphical abstract <p></p>

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Thermo-kinetic for coarsening controlled by matrix diffusion and interface reaction: Reanalyzes in Ni–Al–Cr–X alloys (X = W, Re, Ru)

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Jiachen Zhang,
  • Fan Lu,
  • Pengfa Feng,
  • Yufei Zuo,
  • Qingze Na,
  • Tiantian Ma,
  • Guojun Zhang,
  • Lin Liu

摘要

This study re-examines the coarsening behavior of γ′ precipitates in Ni–8.5Al–10Cr alloys with 2 at % W, Re, or Ru additions at 800 °C using Lifshitz-Slyozov-Wagner (LSW) and trans-interface diffusion-controlled (TIDC) models. Temporal evolution of precipitate size, solute partitioning, volume fraction, and number density revealed that W, Re, and Ru reduced coarsening rates, with Re exhibiting the strongest effect due to suppressed matrix-diffusivity and interfacial energy reduction. Ru induced reversed Al/Cr partitioning in the γ matrix, while Re and Ru preferentially segregated to the γ matrix, contrasting W’s affinity for γ′ precipitate. First-principles calculations and CALPHAD simulations corroborated experimental trends, highlighting elemental site preferences at γ′ precipitate. Both models demonstrated comparable reliability, with TC-PRISMA simulations aligning well with experimental data. Results underscore the critical role of refractory elements in tailoring coarsening mechanisms via diffusion kinetics and interfacial energy modulation, offering insights for alloy design.

Graphical abstract