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The Significance of Entropy in Grain Boundary Segregation
Pavel Lejček1, Siegfried Hofmann2, Václav Paidar3
1Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 1999/2, 182 21 Prague 8, Czech Republic. lejcekp@fzu.cz.
Materials (Basel, Switzerland)
|February 16, 2019
Summary
Entropy significantly impacts materials science, particularly in solute segregation at grain boundaries. Accounting for entropy is crucial for accurate predictions of material properties and behavior.
Area of Science:
- Materials Science
- Thermodynamics
- Physical Metallurgy
Background:
- Entropy is a fundamental thermodynamic property.
- Its role in materials science, especially in phenomena like solute segregation, is often underestimated.
- Accurate materials modeling requires incorporating all relevant thermodynamic factors.
Purpose of the Study:
- To demonstrate the critical role of entropy in materials science.
- To highlight the importance of the entropic term in calculating grain boundary chemistry.
- To illustrate the necessity of entropy in understanding phenomena like enthalpy-entropy compensation and segregation anisotropy.
Main Methods:
- Theoretical analysis of solute segregation at grain boundaries in bcc iron.
- Comparison of grain boundary chemistry calculations with and without the entropic term.
- Discussion of the implications of entropy on segregation anisotropy and interface characterization.
Main Results:
- Substantial differences in calculated grain boundary chemistry when entropy is considered.
- Demonstration of entropy's role in the enthalpy-entropy compensation effect.
- Entropy influences the anisotropy of grain boundary segregation and interface characterization.
Conclusions:
- Entropy is essential for accurate quantification of grain boundary segregation.
- Ignoring entropy leads to ambiguous determination of segregation and impacts materials behavior predictions.
- Incorporating entropy is vital for advancing materials science and predicting material properties.
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