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Updated: Jan 18, 2026
08:55
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
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A Comprehensive Model for Spinodal Decomposition in Ag-Cu Alloys Based on Phase-Field Theory and In Situ TEM
Xin Chen1, Lin Yang1,2, Yuan Zhang3
1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.
ACS Applied Materials & Interfaces
|September 12, 2025
Summary
This study models spinodal decomposition in silver-copper (Ag-Cu) alloys, revealing how initial composition and elastic strain dictate nanostructure evolution. The findings offer crucial insights for advanced materials and alloy design.
Area of Science:
- Materials Science
- Physical Chemistry
- Metallurgy
Background:
- Silver-copper (Ag-Cu) alloys are thermodynamically immiscible, leading to spinodal decomposition.
- Existing research lacks quantitative analysis of mobility and interface thickness during this process.
- Precise understanding of nanostructure evolution is vital for Ag-Cu alloy applications.
Purpose of the Study:
- To develop a comprehensive model for predicting spinodal decomposition in Ag-Cu alloys.
- To quantitatively analyze the spatiotemporal evolution of nanostructures.
- To bridge the gap between phase-field simulations and experimental observations.
Main Methods:
- Utilized the Cahn-Hilliard equation for modeling.
- Combined phase-field simulations with in situ transmission electron microscopy (TEM).
- Investigated the influence of initial composition, immiscibility gap asymmetry, and elastic strain energy.
Main Results:
- Microstructure evolution is initially governed by composition and immiscibility gap asymmetry.
- Elastic strain energy becomes dominant in later stages, determining the final microstructure.
- Step aging facilitates the formation of fine, hierarchical spinodal decomposition morphologies.
Conclusions:
- The developed model accurately predicts Ag-Cu alloy spinodal decomposition.
- This work provides spatiotemporal quantification of nanostructures.
- Offers theoretical guidance for future research and development in Ag-Cu alloys.
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