Nanocrystalline yttria: Grain growth depression by thermal annealing in air. (15th July 2015)

• Record Type: Journal Article
• Authors: Garroni, Sebastiano; Orrù, Roberto; Delogu, Francesco; Cao, Giacomo
• Is Part Of: Scripta materialia. Volume 104(2015)
• Page Start: 33
• Page End: 36
• Publication Date: 2015-07-15
• Subjects: Annealing -- Nanocrystalline material -- Oxides -- Grain growth; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2015.04.002
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract : Nanocrystalline yttria was prepared by mechanical processing. A fraction was annealed in air at 473 K. Annealed and non-annealed powders were treated in Ar at temperatures between 700 and 1000 K, which induced a parabolic grain growth kinetics with an Arrhenius-like dependence on temperature. Grain growth is significantly slower in annealed powders with respect to non-annealed ones. This is related to oxygen chemical absorption during annealing in air and the consequent decrease of oxygen vacancies originally present in powders.