Severe Plastic Deformation through High-Pressure Torsion for Preparation of Hydrogen Storage Materials -A Review

Abstract

Severe plastic deformation (SPD) processes are excellent processing methods that can refine grains, introduce crystal defects and improve mechanical properties and functionality. Among them, high-pressure torsion (HPT) was used for the preparation of hydrogen storage materials in recent years owing to the fact that HPT can process powder materials and introduce greater plastic deformation. HPT technology is not only an effective method to prepare bulk samples from powders, but also a brilliant route to enhance the kinetics, activation, air resistivity and long-term stability of hydrogen storage materials. In addition, new alloys, intermetallics, composites, and hydrogen storage materials even in the immiscible Mg-based alloy systems can be successfully synthesized through the HPT process. In this review, different SPD methods and HPT technology applied for different hydrogen storage materials are carefully reviewed.