Local composition and nanoindentation response of δ-phase and adjacent γ′′-free zone in a Ni-based superalloy

Vitor Vieira Rielli; Felix Theska; Yin Yao; James P. Best; Sophie Primig

doi:10.1080/21663831.2022.2047817

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Local composition and nanoindentation response of δ-phase and adjacent γ′′-free zone in a Ni-based superalloy

Original Reports | 更新时间：2026-08-19

- Local composition and nanoindentation response of δ-phase and adjacent γ′′-free zone in a Ni-based superalloy
- Materials Research Letters Vol. 10, Issue 5, Pages: 301-309(2022)
- 作者机构：
  
  1. a School of Materials Science & Engineering UNSW
  2. b Electron Microscopy Unit (EMU) Mark Wainwright Analytical Centre UNSW
  3. c School of Mechanical & Manufacturing Engineering UNSW Sydney Australia
  4. d Max-Planck-Institut für Eisenforschung GmbH
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2022.2047817
  CLC：
- Online First：10 March 2022，
  
  Published：2022
- 稿件说明：
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Vitor Vieira Rielli, Felix Theska, Yin Yao, et al. Local composition and nanoindentation response of δ-phase and adjacent γ′′-free zone in a Ni-based superalloy[J]. Materials Research Letters, 2022, 10(5): 301-309.
DOI：

Vitor Vieira Rielli, Felix Theska, Yin Yao, et al. Local composition and nanoindentation response of δ-phase and adjacent γ′′-free zone in a Ni-based superalloy[J]. Materials Research Letters, 2022, 10(5): 301-309. DOI： 10.1080/21663831.2022.2047817.

摘要

Abstract

Experimental differentiation of individual strengthening effects from the nanoscale precipitates in Alloy 718 remains challenging due to co-precipitation of

′ and

′′. Here

we examine a region adjacent to the

-phase consisting of

-matrix containing

′-precipitates only. The width and compositional profile of this

′′-free zone is uncovered via high-resolution characterization. Nanomechanical analyses reveal that the lack of

′′-precipitates lower the hardness of the

′′-free zone by 10–20%

while the

-phase is found to be ∼80% harder than the

-matrix. These findings may guide mechanical modelling and microstructural engineering of stronger superalloys critical to aerospace industry.

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Keywords

references

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