Compressive Behavior of Ultrafine-Grained Mg-Zn-Y-Zr Alloy Containing Quasicrystalline Phase

Ming Yi Zheng; S.W. Xu; Wei Min Gan; Kun Wu; Shigeharu Kamado; Yo Kojima; Heinz Günter Brokmeier

doi:10.4028/www.scientific.net/MSF.584-586.287

Paper Titles

Texture Evolution of Magnesium Single Crystals Deformed by High-Pressure Torsion
p.263

Structure of Triple Junctions of Grains, Nanoparticles in them and Bending - Torsion in Metal Nanopolycrystals
p.269

Workability Limits of Commercial Purity Titanium Subjected to Equal Channel Angular Pressing
p.275

Specific Features of Static, Impact, and Fatigue Fracture of the 0.09%C-0.08%Mo-0.03%Nb-0.06%V Steel with Ultrafine-Grained Structure
p.281

Compressive Behavior of Ultrafine-Grained Mg-Zn-Y-Zr Alloy Containing Quasicrystalline Phase
p.287

Shear Induced Low- and High-Angle Boundary Characterization Using Kikuchi Bands in Transmission Electron Microscopy
p.293

Microstructure Evolution during High Pressure Torsion of AZ80 Magnesium Alloy
p.300

Microstructure of a Metal-Polymer Composite Processed by Severe Plastic Deformation
p.306

Influence of SPD by ECAP on Cu Properties
p.310

HomeMaterials Science ForumMaterials Science Forum Vols. 584-586Compressive Behavior of Ultrafine-Grained...

Compressive Behavior of Ultrafine-Grained Mg-Zn-Y-Zr Alloy Containing Quasicrystalline Phase

Abstract:

An ultrafine-grained (UFG) Mg-5.0wt%Zn-0.9wt%Y-0.2wt%Zr magnesium alloy with a grain size of about 0.8 µm was produced by subjecting the extruded alloy to equal channel angular pressing (ECAP) for 8 passes at 473 K. Compressive testing was performed on the ECAPed alloy in a temperature range from 423 K to 523 K and under strain rates from 1.67×10-3 to 1.67×10-1 s-1. The ultrafine grains of the ECAPed alloy were stable during compression because of the presence of the dispersion of a fine quasicrystal I-phase and of precipitates in the alloy, which restricted grain growth. The activation energy for the compression at the temperature range from 423 K to 523 K is close to the value for grain boundary diffusion in magnesium, indicating that the compressive deformation is mainly controlled by grain-boundary sliding.