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Emergence of stable interfaces under extreme plastic deformation
Irene J Beyerlein1, Jason R Mayeur, Shijian Zheng
1Theoretical Division, Materials Physics and Application Division, and Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545.
Summary
Atomically ordered bimetal interfaces, previously formed by bottom-up methods, can now be created using extreme strain (top-down processing). This discovery enables the fabrication of stable nanomaterials through severe plastic deformation.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Metallurgy
Background:
- Atomically ordered bimetal interfaces are crucial for nanolayered composite films.
- These interfaces are typically formed via near-equilibrium epitaxial growth (bottom-up processing).
- Their role in material properties has been extensively studied.
Purpose of the Study:
- To investigate the formation of atomically ordered bimetal interfaces in large-scale nanocomposites fabricated by extreme strain (top-down processing).
- To understand the mechanisms behind interface formation under severe plastic deformation.
- To identify conditions for predicting and ensuring the stability of these interfaces.
Main Methods:
- Fabrication of large-scale layered nanocomposites using extreme strain (top-down) processing.
- Atomic-scale modeling to understand interface formation.
- Crystal plasticity theory to predict interface stability.
- Experimental validation of interface stability under various conditions.
Main Results:
- Atomically ordered bimetal interfaces ubiquitously emerge in nanocomposites fabricated by extreme plastic straining.
- Extreme plastic deformation creates new interfaces separated by single crystal layers.
- A unique stable bimetal interface state, predictable by two stability conditions, arises from extreme strains.
- The discovered interfaces exhibit remarkable stability under further straining, elevated temperatures, and irradiation.
Conclusions:
- Extreme strain processing offers a novel top-down approach to create atomically ordered bimetal interfaces.
- The stability of these interfaces is governed by predictable conditions.
- This work opens new avenues for fabricating robust nanomaterials using severe plastic deformation techniques.
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