Mechanical alloying produces grain boundary segregation in Fe–Mg powders. (15th April 2020)

• Record Type: Journal Article
• Authors: Amram, Dor; Schuh, Christopher A.
• Is Part Of: Scripta materialia. Number 180(2020)
• Page Start: 57
• Page End: 61
• Publication Date: 2020-04-15
• Subjects: Nanocrystalline metal -- Grain boundary segregation -- Mechanical alloying -- Ball mill -- Iron alloys; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.01.021
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Although mechanical alloying can force immiscible elements into homogeneous solid solution due to its chemically "randomizing" nature, as microstructure design of powder-processed alloys advances, other alloy configurations are also sought. Here we study ball milling of Fe–Mg alloys and obtain a heterogeneous nanostructure, with grain boundaries decorated by solute even after reaching complete supersaturation and a steady-state grain size. Such nanocrystalline powders having grain boundary segregation in the as-milled state are particularly useful for thermal stability against grain growth. The high diffusivity of Mg is thought to shift the competition between ballistic mixing and equilibration, permitting such a structure to form. Graphical abstract: Image, graphical abstract