title: Decreasing the grain boundary diffusivity in binary alloys with increasing temperature.
abstract: 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.
authors.affiliation: School of Materials Science and Engineering and Center for Optical Materials Science and Engineering Technologies, Clemson University, Clemson, South Carolina 29634, USA.
authors.forename: Xiaomeng
authors.initials: X
authors.lastname: Shi
authors.forename: Jian
authors.initials: J
authors.lastname: Luo