The influence of grain boundary area on the complexion time-temperature-transformation diagram of Eu-doped magnesium aluminate spinel. (15th March 2020)

• Record Type: Journal Article
• Authors: Krause, Amanda R.; Kundu, Animesh; Kosasang, Onthida; Vinci, Richard P.; Harmer, Martin P.
• Is Part Of: Scripta materialia. Number 178(2020)
• Page Start: 251
• Page End: 255
• Publication Date: 2020-03-15
• Subjects: Grain boundaries -- Abnormal grain growth -- Magnesium aluminate spinel; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.11.041
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We demonstrate the sensitivity of complexion time-temperature-transformation (TTT)-diagrams to composition and grain size in Eu-doped MgAl2 O4 . 100 ppm and 500 ppm Eu-doped MgAl2 O4 undergo the same complexion transition, which causes abnormal grain growth, but exhibit different nucleation and grain growth rates. The Eu content per grain boundary area (Eu/GBA) was calculated for various heat treatments using a simple model based on average grain size. Despite their differences, a common Eu/GBA is calculated at the onset of abnormal grain growth. This common grain boundary excess has important implications for complexion TTT-diagrams and provides a new metric for predicting abnormal grain growth. Graphical abstract: Image, graphical abstract