Theoretical and experimental quantification of Suzuki segregation enthalpy and strengthening mechanisms in a binary alloy
Abstract Solute segregation to planar defects in metallic alloys has been shown to drastically alter mechanical properties. While various works using first-principles and thermodynamic calculations have studied the fundamental driving forces for solute segregation via the Suzuki criterion, planar de...
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Nature Portfolio
2025-07-01
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| Series: | Communications Materials |
| Online Access: | https://doi.org/10.1038/s43246-025-00864-6 |
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| author | Victoria Tucker Dongsheng Wen Victoria Cooley Jun-Sang Park Michael S. Titus |
| author_facet | Victoria Tucker Dongsheng Wen Victoria Cooley Jun-Sang Park Michael S. Titus |
| author_sort | Victoria Tucker |
| collection | DOAJ |
| description | Abstract Solute segregation to planar defects in metallic alloys has been shown to drastically alter mechanical properties. While various works using first-principles and thermodynamic calculations have studied the fundamental driving forces for solute segregation via the Suzuki criterion, planar defect energy, or a comparison of energies of the HCP-like phase and FCC matrix, a quantitative experimental and computational comparison of equilibrium composition and segregation enthalpies has not yet been reported. In this work, we predict the equilibrium composition and segregation enthalpy to intrinsic stacking faults in a Ni-60Co (at.%) alloy and compare the results to two independent experimental methods. We observed that Co segregates to the innermost two planes of the intrinsic stacking fault, and we found that the experimental segregation enrichment, measured from transmission electron microscopy energy dispersive X-ray spectroscopy, of the faults is 6.8 at.% Co, which is 2.2 at.% less than the predicted value at the same temperature. We also find that the segregation enthalpy measured from the composition profile is −21.1 ± 6.4 meV/atom and separately from differential scanning calorimetry segregation enthalpy is −66 meV/atom, whereas the predicted enthalpy is −31 ± 1 meV/atom. Based on these results, we determine that segregation occurs very rapidly, within 8 min at temperatures as low as 36% of the homologous solidus temperature. Furthermore, this analysis provides an overview of the possible dislocation mechanisms responsible for strengthening effects due to solute segregation, and concludes that changes in room temperature hardness from local phase transformation is likely tied to post-segregation room temperature equilibrium partial separation distance. |
| format | Article |
| id | doaj-art-bc29d8dce8eb4056b34c173416346f6e |
| institution | Kabale University |
| issn | 2662-4443 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Nature Portfolio |
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| spelling | doaj-art-bc29d8dce8eb4056b34c173416346f6e2025-08-20T03:46:28ZengNature PortfolioCommunications Materials2662-44432025-07-016111010.1038/s43246-025-00864-6Theoretical and experimental quantification of Suzuki segregation enthalpy and strengthening mechanisms in a binary alloyVictoria Tucker0Dongsheng Wen1Victoria Cooley2Jun-Sang Park3Michael S. Titus4School of Materials Engineering, Purdue UniversityDepartment of Chemistry, University of LiverpoolAdvanced Photon Source, Argonne National LaboratoryAdvanced Photon Source, Argonne National LaboratorySchool of Materials Engineering, Purdue UniversityAbstract Solute segregation to planar defects in metallic alloys has been shown to drastically alter mechanical properties. While various works using first-principles and thermodynamic calculations have studied the fundamental driving forces for solute segregation via the Suzuki criterion, planar defect energy, or a comparison of energies of the HCP-like phase and FCC matrix, a quantitative experimental and computational comparison of equilibrium composition and segregation enthalpies has not yet been reported. In this work, we predict the equilibrium composition and segregation enthalpy to intrinsic stacking faults in a Ni-60Co (at.%) alloy and compare the results to two independent experimental methods. We observed that Co segregates to the innermost two planes of the intrinsic stacking fault, and we found that the experimental segregation enrichment, measured from transmission electron microscopy energy dispersive X-ray spectroscopy, of the faults is 6.8 at.% Co, which is 2.2 at.% less than the predicted value at the same temperature. We also find that the segregation enthalpy measured from the composition profile is −21.1 ± 6.4 meV/atom and separately from differential scanning calorimetry segregation enthalpy is −66 meV/atom, whereas the predicted enthalpy is −31 ± 1 meV/atom. Based on these results, we determine that segregation occurs very rapidly, within 8 min at temperatures as low as 36% of the homologous solidus temperature. Furthermore, this analysis provides an overview of the possible dislocation mechanisms responsible for strengthening effects due to solute segregation, and concludes that changes in room temperature hardness from local phase transformation is likely tied to post-segregation room temperature equilibrium partial separation distance.https://doi.org/10.1038/s43246-025-00864-6 |
| spellingShingle | Victoria Tucker Dongsheng Wen Victoria Cooley Jun-Sang Park Michael S. Titus Theoretical and experimental quantification of Suzuki segregation enthalpy and strengthening mechanisms in a binary alloy Communications Materials |
| title | Theoretical and experimental quantification of Suzuki segregation enthalpy and strengthening mechanisms in a binary alloy |
| title_full | Theoretical and experimental quantification of Suzuki segregation enthalpy and strengthening mechanisms in a binary alloy |
| title_fullStr | Theoretical and experimental quantification of Suzuki segregation enthalpy and strengthening mechanisms in a binary alloy |
| title_full_unstemmed | Theoretical and experimental quantification of Suzuki segregation enthalpy and strengthening mechanisms in a binary alloy |
| title_short | Theoretical and experimental quantification of Suzuki segregation enthalpy and strengthening mechanisms in a binary alloy |
| title_sort | theoretical and experimental quantification of suzuki segregation enthalpy and strengthening mechanisms in a binary alloy |
| url | https://doi.org/10.1038/s43246-025-00864-6 |
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