Unraveling Thermodynamic and Kinetic Contributions to the Stability of Doped Nanocrystalline Alloys using Nanometallic Multilayers

Targeted doping of grain boundaries is widely pursued as a pathway for combating thermal instabilities in nanocrystalline metals. However, certain dopants predicted to produce grain‐boundary‐segregated nanocrystalline configurations instead form small nanoprecipitates at elevated temperatures that a...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2022-07, Vol.34 (27), p.e2200354-n/a
Main Authors: Cunningham, W. Streit, Mascarenhas, Sean T. J., Riano, J. Sebastian, Wang, Wenbo, Hwang, Sooyeon, Hattar, Khalid, Hodge, Andrea M., Trelewicz, Jason R.
Format: Article
Language:English
Subjects:
Boundaries
Clustering
Decoupling
ENERGY STORAGE
Evolution
Grain boundaries
Grain boundary migration
grain boundary segregation
Grain growth
Grain structure
High temperature
Homology
MATERIALS SCIENCE
Microstructure
Mo-Au
Multilayers
Nanoalloys
nanocrystalline alloys
Nanocrystals
nanometallic multilayers
Phase transitions
Thermal instability
Thermal stability
Thermodynamic models
thermodynamic stability
Thermodynamics
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Summary:Targeted doping of grain boundaries is widely pursued as a pathway for combating thermal instabilities in nanocrystalline metals. However, certain dopants predicted to produce grain‐boundary‐segregated nanocrystalline configurations instead form small nanoprecipitates at elevated temperatures that act to kinetically inhibit grain growth. Here, thermodynamic modeling is implemented to select the Mo–Au system for exploring the interplay between thermodynamic and kinetic contributions to nanostructure stability. Using nanoscale multilayers and in situ transmission electron microscopy thermal aging, evolving segregation states and the corresponding phase transitions are mapped with temperature. The microstructure is shown to evolve through a transformation at lower homologous temperatures (
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.202200354