Fabrication and Characterization of Supersaturated Al-Mg Alloys by Severe Plastic Deformation and Their Mechanical Properties

Abstract

Excess amount of Mg was intentionally added to fabricate supersaturated ultra-fine grained Al-Mg alloy by high pressure torsion (HPT). Their microstructures and mechanical properties were examined by X-ray diffraction (XRD) analysis, transmission electron microscopy (TEM) and Vickers microhardness test. It was confirmed that the minimum grain size reached ∼40 nm and maximum microhardness 292 Hv at the Mg content with 30 mass%. Further increase of the amount of Mg resulted the formation of β-Al₃Mg₂ and decrease of microhardness.