A compact coherent nanoprecipitate architecture for enhanced strength in a Ni-rich medium-entropy alloy

S. K. Guo; Z. L. Ma; C. Li; X. Y. Jin; Z. D. Shen; H. Y. Li; X. W. Cheng

doi:10.1016/j.msea.2026.150761

A compact coherent nanoprecipitate architecture for enhanced strength in a Ni-rich medium-entropy alloy

S. K. Guo
, Z. L. Ma^*
, C. Li
, X. Y. Jin
, Z. D. Shen
, H. Y. Li
, X. W. Cheng

^*Corresponding author for this work

School of Material Science and Engineering

Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

Abstract

We engineer a unique compact coherent architecture in a Ni-rich MEA, featuring cuboidal L1₂-γ′ nanoprecipitates fully encapsulated by a continuous D0₂₂-γ″ shell. This structure elevates the yield strength to 1122 MPa from 951 MPa (for the alloy containing monolithic γ′ precipitates) and retains a uniform elongation of 14.9%. The synergy originates from a dual mechanism where the coherent D0₂₂-γ″ shell strongly impedes dislocation motion, and the composite precipitate subsequently undergoes coordinated shear via a complex stacking fault sequence, effectively accommodating strain without severe localization. This work establishes architectural control of coherent precipitates as an effective design principle for performance optimization.

Original language	English
Article number	150761
Journal	Materials Science and Engineering: A
Volume	973
DOIs	https://doi.org/10.1016/j.msea.2026.150761
Publication status	Published - Oct 2026

Keywords

Compact precipitate
Mechanical properties
Medium-entropy alloy
Precipitation strengthening

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10.1016/j.msea.2026.150761

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title = "A compact coherent nanoprecipitate architecture for enhanced strength in a Ni-rich medium-entropy alloy",

abstract = "We engineer a unique compact coherent architecture in a Ni-rich MEA, featuring cuboidal L12-γ′ nanoprecipitates fully encapsulated by a continuous D022-γ″ shell. This structure elevates the yield strength to 1122 MPa from 951 MPa (for the alloy containing monolithic γ′ precipitates) and retains a uniform elongation of 14.9\%. The synergy originates from a dual mechanism where the coherent D022-γ″ shell strongly impedes dislocation motion, and the composite precipitate subsequently undergoes coordinated shear via a complex stacking fault sequence, effectively accommodating strain without severe localization. This work establishes architectural control of coherent precipitates as an effective design principle for performance optimization.",

keywords = "Compact precipitate, Mechanical properties, Medium-entropy alloy, Precipitation strengthening",

author = "Guo, \{S. K.\} and Ma, \{Z. L.\} and C. Li and Jin, \{X. Y.\} and Shen, \{Z. D.\} and Li, \{H. Y.\} and Cheng, \{X. W.\}",

note = "Publisher Copyright: {\textcopyright} 2026",

year = "2026",

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doi = "10.1016/j.msea.2026.150761",

language = "English",

volume = "973",

journal = "Materials Science and Engineering: A",

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TY - JOUR

T1 - A compact coherent nanoprecipitate architecture for enhanced strength in a Ni-rich medium-entropy alloy

AU - Guo, S. K.

AU - Ma, Z. L.

AU - Li, C.

AU - Jin, X. Y.

AU - Shen, Z. D.

AU - Li, H. Y.

AU - Cheng, X. W.

PY - 2026/10

Y1 - 2026/10

N2 - We engineer a unique compact coherent architecture in a Ni-rich MEA, featuring cuboidal L12-γ′ nanoprecipitates fully encapsulated by a continuous D022-γ″ shell. This structure elevates the yield strength to 1122 MPa from 951 MPa (for the alloy containing monolithic γ′ precipitates) and retains a uniform elongation of 14.9%. The synergy originates from a dual mechanism where the coherent D022-γ″ shell strongly impedes dislocation motion, and the composite precipitate subsequently undergoes coordinated shear via a complex stacking fault sequence, effectively accommodating strain without severe localization. This work establishes architectural control of coherent precipitates as an effective design principle for performance optimization.

AB - We engineer a unique compact coherent architecture in a Ni-rich MEA, featuring cuboidal L12-γ′ nanoprecipitates fully encapsulated by a continuous D022-γ″ shell. This structure elevates the yield strength to 1122 MPa from 951 MPa (for the alloy containing monolithic γ′ precipitates) and retains a uniform elongation of 14.9%. The synergy originates from a dual mechanism where the coherent D022-γ″ shell strongly impedes dislocation motion, and the composite precipitate subsequently undergoes coordinated shear via a complex stacking fault sequence, effectively accommodating strain without severe localization. This work establishes architectural control of coherent precipitates as an effective design principle for performance optimization.

KW - Compact precipitate

KW - Mechanical properties

KW - Medium-entropy alloy

KW - Precipitation strengthening

UR - https://www.scopus.com/pages/publications/105044546904

U2 - 10.1016/j.msea.2026.150761

DO - 10.1016/j.msea.2026.150761

M3 - Article

AN - SCOPUS:105044546904

SN - 0921-5093

VL - 973

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

M1 - 150761

ER -

A compact coherent nanoprecipitate architecture for enhanced strength in a Ni-rich medium-entropy alloy

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Keywords

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