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Published on: August 2, 2019
Simultaneous segregation at coherent and semicoherent heterophase interfaces.
Aniruddha Biswas1, Donald J Siegel, David N Seidman
1Department of Materials Science and Engineering, Northwestern University, 2220 Campus Drive, Evanston, Illinois 60208, USA.
Researchers found distinct solute segregation patterns at different interfaces within an aluminum-copper alloy using atom-probe tomography and computational methods. These findings reveal crucial links between interface structure, composition, and energy in materials science.
Area of Science:
- Materials Science
- Metallurgy
- Computational Materials Science
Background:
- Solute segregation at interfaces significantly influences material properties.
- Understanding interface structure-property relationships is crucial for alloy design.
Purpose of the Study:
- To investigate solute segregation differences at coherent and semicoherent interfaces.
- To quantify the impact of segregation on interfacial energy.
Main Methods:
- Three-dimensional atom-probe tomography (3D APT) for atomic-scale chemical analysis.
- First-principles calculations for theoretical modeling of interface energetics.
Main Results:
- Qualitative differences: localized segregation at semicoherent interfaces, delocalized at coherent interfaces.
- Quantitative differences: 2x greater segregation at semicoherent interfaces.
- Over 5x greater decrease in interfacial energy at semicoherent interfaces due to segregation.
Conclusions:
- Demonstrates strong couplings between interface structure, chemical composition, and energetics.
- Highlights the importance of interface type in controlling solute behavior.
- Provides insights for designing advanced Al-Cu alloys.
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