A thermo-kinetic correlation for grain growth in nanocrystalline alloys

•A thermo-kinetic correlation for grain growth is derived.•GB energy is found to be reduced with increased activation energy by MD simulations.•The effects of GB energy and activation energy coexist and interact during grain growth. The thermo-kinetic stabilization that incorporates mixed effects of...

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Bibliographic Details
Published in:Materials letters 2018-05, Vol.219, p.276-279
Main Authors: Peng, H.R., Huang, L.K., Liu, F.
Format: Article
Language:English
Subjects:
Activation energy
Alloys
Correlation
Grain boundaries
Grain boundary energy
Grain growth
Materials science
Molecular chains
Nanocrystals
Segregation
Thermal stability
Thermodynamics
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Summary:•A thermo-kinetic correlation for grain growth is derived.•GB energy is found to be reduced with increased activation energy by MD simulations.•The effects of GB energy and activation energy coexist and interact during grain growth. The thermo-kinetic stabilization that incorporates mixed effects of grain boundary (GB) energy and activation energy for GB migration has shown enormous advantages in describing thermal stability of nanocrystalline materials. However, its underlying physics is still unclear due to the lack of proofs that the two effects coexist and act together to impact on grain growth. In this work, a thermo-kinetic correlation is derived to bridge GB energy and activation energy in nanocrystalline alloys. Meanwhile, molecular dynamic simulations are performed to determine the two parameters in Al-based systems. The results shows that upon GB segregation, the GB energy is reduced in contrast with the increased activation energy. This analytically suggests a thermo-kinetic origin for stabilization due to GB segregation, other than pure thermodynamic or kinetic sources.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2018.02.114