Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.236102
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Funding
- AFOSR [FA9550-10-1-0185, FA9550-07-1-0125]
- DOE NETL [DE-FE0003892]
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An interfacial thermodynamic model predicts that the interplay of grain boundary (GB) premelting, prewetting, and retrograde solubility in a binary alloy can lead to a decrease in the GB diffusivity with increasing temperature. This counterintuitive prediction is experimentally confirmed for a single-phase, Mo +0.5 at. % Ni alloy. This study calls for a reappraisal of the classical GB adsorption (segregation) theories to consider the coupling with structural disordering, and it critically supports GB premelting and prewetting theories with broad applications.
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