Thermodynamic model of porosity stabilization in polycrystalline solids. (November 2018)

• Record Type: Journal Article
• Authors: Klinger, L.; Rabkin, E.
• Is Part Of: Scripta materialia. Number 156(2018)
• Page Start: 75
• Page End: 79
• Publication Date: 2018-11
• Subjects: Surface segregation -- Grain boundary segregation -- Thermodynamics -- Nanocrystalline materials -- Modeling; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.07.013
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We demonstrate that a strong surface segregation of one of the components of the binary polycrystalline material can lead to barrier-less pore formation at the triple and quadruple junctions of the grain boundaries. These pores deplete the bulk of the polycrystal from the segregating component, which can lead to a local minimum in the dependence of the Gibbs free energy of the system on the pore size. We show that in some cases a porous polycrystal can be thermodynamically stabilized. Graphical abstract: Unlabelled Image