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Related Experiment Video

Updated: Feb 2, 2026

Structure-Based Simulation and Sampling of Transcription Factor Protein Movements along DNA from Atomic-Scale Stepping to Coarse-Grained Diffusion

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Diffusion-defining atomic-scale spinodal decomposition within nanoprecipitates.

Angelina Orthacker^1,2, Georg Haberfehlner^3,4, Johannes Taendl⁵

¹Institute of Electron Microscopy and Nanoanalysis, Graz University of Technology, Graz, Austria. angelina.orthacker@tugraz.at.

Nature Materials

|November 14, 2018

Summary

Deviations in the composition and ordering of precipitates in Al-Mg-Sc-Zr alloys significantly impact their evolution. Atomic-scale spinodal decomposition drives diffusion, highlighting the importance of precise control in multicomponent systems.

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Area of Science:

Materials Science
Metallurgy
Physical Chemistry

Background:

Stoichiometric precipitates typically have fixed compositions due to ordered crystal structures.
Deviations from nominal compositions in precipitates are observed and require investigation.
Understanding precipitate behavior is crucial for advanced alloy development.

Purpose of the Study:

To investigate the composition, structure, and diffusion phenomena of ordered precipitates in an Al-Mg-Sc-Zr alloy system.
To reveal the temporal evolution of precipitate ordering and non-equilibrium structures.
To elucidate the role of atomic-scale diffusion processes in alloy development.

Main Methods:

Aberration-corrected scanning transmission electron microscopy (STEM) and analytical tomography.
Thermodynamic calculations.
Diffusion simulations.

Main Results:

Detailed atomic-scale insights into precipitate evolution and ordering.
Identification of non-equilibrium structures with high spatial resolution.
Atomic-scale spinodal decomposition identified as a major diffusion driver.
Demonstration of the significant impact of minor composition and ordering deviations.

Conclusions:

Precise control over precipitate composition and ordering is critical for multicomponent alloys.
The interplay between Gibbs energies, atomic jump activation energies, and phase ordering governs alloy evolution.
Atomic-scale spinodal decomposition is a key mechanism in precipitate diffusion processes.