Microstructure Optimization of Mg-Alloys by the ECAP Process Including Numerical Simulation, SPD Treatments, Characterization, and Hydrogen Sorption Properties.

摘要: Both numerical simulation and hardness measurements were used to determine the mechanical microstructural behavior of AZ31 bulk samples when submitted Equal Channel Angular Pressing (ECAP) technique. Billets this representative Mg-rich alloys different numbers passes for various ECAP modes (anisotropic A, isotropic BC). The strain distribution, grain size refinement, micro-hardness as indicators quantify effectiveness processing routes. Structural characterizations at scales achieved using Scanning Electron Microscopy (SEM), micro-analysis, metallography, Small Angle Neutron Scattering SANS, X-Ray Diffraction (XRD), texture determination. crystallite distribution orientation well defect impacts determined. Anelastic Spectroscopy (AS) on mechanically deformed have shown that temperature differentiate fragile ductile regime. MgH2 consolidated powders checked AS detect potential hydrogen motions interaction with host metal atoms. After further optimization, mechanically-treated hydrogenation/dehydrogenation (H/D) cycles, which shows that, a few passes, BC mode is better than A one, supported by theoretical experimental microstructure analyses. Accordingly, uptake reactions correlated optimized peculiarities interpreted in terms Johnson-Avrami- Mehl-Kolmogorov (JAMK) Jander models, successively.