Refinement of the icosahedral quasicrystalline phase and the grain size of Mg–9.25Zn–1.66Y alloy by high-ratio differential speed rolling

• Published in: Scripta materialia Vol. 103; pp. 49 - 52
• Main Authors: Kwak, T.Y., Lim, H.K., Han, S.H., Kim, W.J.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-07-2015
• Subjects: Electron backscattering diffraction (EBSD); Elongation; Eutectics; Grain size; Icosahedral phase; Magnesium alloys; Magnesium base alloys; Particle stimulated nucleation (PSN); Plastic deformation; Severe plastic deformation (SPD); Solid phases; Yield stress; Electron backscattering diffraction (EBSD); Severe plastic deformation (SPD); Magnesium alloys; Particle stimulated nucleation (PSN)
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2015.03.004

Differential speed rolling was applied to a Mg–9.25Zn–1.66Y alloy with an icosahedral quasicrystalline (I) phase to refine its cast microstructure by severe plastic deformation. The grain size was reduced to ∼1μm. A higher speed ratio, which produces a higher shear strain, was more effective in breaking up the eutectic I phase structure and dispersing the broken particles into the matrix. The processed alloy exhibited a high yield stress of 337MPa and a good elongation of 10.7%.