Suppressing γ′ precipitates coarsening at high volume fractions in a NiCoCr alloy by synergy of Co and Cr

S. Y. Yuan; Y. Q. Yang; B. B. Zhang; K. G. Wang; Y. T. Zhu; X. Y. Li; Y. Zhang

doi:10.1016/j.scriptamat.2025.116561

Suppressing γ′ precipitates coarsening at high volume fractions in a NiCoCr alloy by synergy of Co and Cr

S. Y. Yuan
, Y. Q. Yang
, B. B. Zhang
, K. G. Wang
, Y. T. Zhu
, X. Y. Li^*
, Y. Zhang^*

^*Corresponding author for this work

Department of Materials Science and Engineering

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

4 Citations (Scopus)

Abstract

In this work, we investigated coarsening kinetics of γ′ precipitates at 800–950°C of a novel NiCoCr multicomponent alloy, which was designed to contain a high (Co+Cr) concentration and a high volume fraction of γ′ precipitates. Experimental results demonstrated that γ′ precipitates in the present NiCoCr alloy were more resistant to the thermal coarsening at temperatures above 900°C as compared to conventional Ni-based alloys. Analysis using the modified Lifshitz-Slyozov-Wagner (LSW) model revealed that both Co and Cr could serve as the dominating species to control γ′ precipitate coarsening. The synergy of Co and Cr led to the slower diffusion in the current NiCoCr alloy than those in dilute binary systems, responsible for the superior thermal stability of γ′ precipitates. Our work provides a new guideline for exploring the compositional space of NiCoCr-based multicomponent alloys with high volume fraction of γ′ precipitates but low γ′ coarsening rate. © 2025

Original language	English
Article number	116561
Journal	Scripta Materialia
Volume	259
Online published	24 Jan 2025
DOIs	https://doi.org/10.1016/j.scriptamat.2025.116561
Publication status	Published - 1 Apr 2025

Research Keywords

Coarsening kinetics
Diffusion
High/Medium entropy alloy
Thermal stability, γ′ precipitates

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title = "Suppressing γ′ precipitates coarsening at high volume fractions in a NiCoCr alloy by synergy of Co and Cr",

abstract = "In this work, we investigated coarsening kinetics of γ′ precipitates at 800–950°C of a novel NiCoCr multicomponent alloy, which was designed to contain a high (Co+Cr) concentration and a high volume fraction of γ′ precipitates. Experimental results demonstrated that γ′ precipitates in the present NiCoCr alloy were more resistant to the thermal coarsening at temperatures above 900°C as compared to conventional Ni-based alloys. Analysis using the modified Lifshitz-Slyozov-Wagner (LSW) model revealed that both Co and Cr could serve as the dominating species to control γ′ precipitate coarsening. The synergy of Co and Cr led to the slower diffusion in the current NiCoCr alloy than those in dilute binary systems, responsible for the superior thermal stability of γ′ precipitates. Our work provides a new guideline for exploring the compositional space of NiCoCr-based multicomponent alloys with high volume fraction of γ′ precipitates but low γ′ coarsening rate. {\textcopyright} 2025",

keywords = "Coarsening kinetics, Diffusion, High/Medium entropy alloy, Thermal stability, γ′ precipitates",

author = "Yuan, \{S. Y.\} and Yang, \{Y. Q.\} and Zhang, \{B. B.\} and Wang, \{K. G.\} and Zhu, \{Y. T.\} and Li, \{X. Y.\} and Y. Zhang",

year = "2025",

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doi = "10.1016/j.scriptamat.2025.116561",

language = "English",

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TY - JOUR

T1 - Suppressing γ′ precipitates coarsening at high volume fractions in a NiCoCr alloy by synergy of Co and Cr

AU - Yuan, S. Y.

AU - Yang, Y. Q.

AU - Zhang, B. B.

AU - Wang, K. G.

AU - Zhu, Y. T.

AU - Li, X. Y.

AU - Zhang, Y.

PY - 2025/4/1

Y1 - 2025/4/1

N2 - In this work, we investigated coarsening kinetics of γ′ precipitates at 800–950°C of a novel NiCoCr multicomponent alloy, which was designed to contain a high (Co+Cr) concentration and a high volume fraction of γ′ precipitates. Experimental results demonstrated that γ′ precipitates in the present NiCoCr alloy were more resistant to the thermal coarsening at temperatures above 900°C as compared to conventional Ni-based alloys. Analysis using the modified Lifshitz-Slyozov-Wagner (LSW) model revealed that both Co and Cr could serve as the dominating species to control γ′ precipitate coarsening. The synergy of Co and Cr led to the slower diffusion in the current NiCoCr alloy than those in dilute binary systems, responsible for the superior thermal stability of γ′ precipitates. Our work provides a new guideline for exploring the compositional space of NiCoCr-based multicomponent alloys with high volume fraction of γ′ precipitates but low γ′ coarsening rate. © 2025

AB - In this work, we investigated coarsening kinetics of γ′ precipitates at 800–950°C of a novel NiCoCr multicomponent alloy, which was designed to contain a high (Co+Cr) concentration and a high volume fraction of γ′ precipitates. Experimental results demonstrated that γ′ precipitates in the present NiCoCr alloy were more resistant to the thermal coarsening at temperatures above 900°C as compared to conventional Ni-based alloys. Analysis using the modified Lifshitz-Slyozov-Wagner (LSW) model revealed that both Co and Cr could serve as the dominating species to control γ′ precipitate coarsening. The synergy of Co and Cr led to the slower diffusion in the current NiCoCr alloy than those in dilute binary systems, responsible for the superior thermal stability of γ′ precipitates. Our work provides a new guideline for exploring the compositional space of NiCoCr-based multicomponent alloys with high volume fraction of γ′ precipitates but low γ′ coarsening rate. © 2025

KW - Coarsening kinetics

KW - Diffusion

KW - High/Medium entropy alloy

KW - Thermal stability, γ′ precipitates

UR - https://www.scopus.com/pages/publications/85215831754

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85215831754&origin=recordpage

U2 - 10.1016/j.scriptamat.2025.116561

DO - 10.1016/j.scriptamat.2025.116561

M3 - RGC 21 - Publication in refereed journal

SN - 1359-6462

VL - 259

JO - Scripta Materialia

JF - Scripta Materialia

M1 - 116561

ER -

Suppressing γ′ precipitates coarsening at high volume fractions in a NiCoCr alloy by synergy of Co and Cr

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