Severe plastic deformation close to the melting point enables Mg-Fe nanocomposites with exceptional strength. (June 2023)

• Record Type: Journal Article
• Authors: Roostaei, Milad; Uggowitzer, Peter J.; Pippan, Reinhard; Renk, Oliver
• Is Part Of: Scripta materialia. Number 230(2023)
• Publication Date: 2023-06
• Subjects: hcp-bcc nanocomposites -- Magnesium -- Iron -- Nanostructured -- High-pressure torsion -- strain localization; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2023.115428
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The attractive properties of Mg-bcc nanocomposites have gained increasing interest, but fabrication to bulk scales failed so far as strain immediately localizes within the Mg-phase. Targeting successful processing strategies, we analyze the deformation behavior and resulting microstructures of Mg-Fe composites as a function of applied strain and processing temperature using high-pressure torsion. Counterintuitively, processing at 73% of Mg's melting point accelerated microstructural refinement and improved homogeneity. Suppressing strain localization of the phases, a three-fold hardness increase compared to ambient processing is obtained. Such hardness levels suggest that further optimization likely paves the way towards bulk Mg-based materials beyond a gigapascal strength. Graphical abstract: Image, graphical abstract