The effect of rare earth element segregation on grain boundary energy and mobility in magnesium and ensuing texture weakening. (15th March 2018)

• Record Type: Journal Article
• Authors: Barrett, Christopher D.; Imandoust, Aidin; El Kadiri, Haitham
• Is Part Of: Scripta materialia. Number 146(2018)
• Page Start: 46
• Page End: 50
• Publication Date: 2018-03-15
• Subjects: Magnesium -- Recrystallization -- Molecular dynamics -- Electron back-scatter diffraction -- Segregation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.11.004
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: This paper elucidates a key puzzle related to texture randomization - effect of rare earth on grain boundaries. We use electron back-scatter diffraction and molecular dynamics to compare recrystallization between pure Mg and a Y-containing alloy. The alloy's texture components were initially similar, but the large ⟨ a ⟩ fiber grains in pure Mg overtook all other components. Y segregation homogenized the energies of ⟨ a ⟩ fiber grain boundaries, curtailing conventional recrystallization. Grain boundary mobilities were reduced proportionally to the energy stabilization, reducing the dominance of 10 1 ¯ 0 extrusion texture. This allows other grain orientations to stabilize thus producing a more randomized texture. Graphical abstract: