Abstract
In this paper we review the latest developments in the use of severe plastic deformation (SPD) techniques for enhancement of hydrogen sorption properties of magnesium and magnesium alloys. Main focus will be on two techniques: Equal Channel Angular Pressing (ECAP) and Cold Rolling (CR). After a brief description of these two techniques we will discuss their effects on the texture and hydrogen sorption properties of magnesium alloys. In particular, the effect of the processing temperature in ECAP on texture will be demonstrated. We also show that ECAP and CR have produced different textures. Despite the scarcity of experimental results, the investigations up to now indicate that SPD techniques produce metal hydrides with enhanced hydrogen storage properties.
Highlights
Since the last few years the effects of mechanical deformation on the hydrogen storage behavior of metal hydrides have been intensively studied
While the method is progressing at the industrial level, knowledge about the physical mechanisms operating during the mechanochemical treatment is still very limited due to serious difficulties in quantifying this complex process [2]
In the Equal Channel Angular Pressing (ECAP) severe plastic deformations are introduced into a material by forcing a sample with a piston through a die consisting of two channels of equal cross-section, which intersect at an angle (Φ) between 90° and 120° [24]
Summary
Since the last few years the effects of mechanical deformation on the hydrogen storage behavior of metal hydrides have been intensively studied. Mechanical milling effects could be enhanced by changing parameters such as milling atmosphere (reactive milling), temperature, addition of anti-sticking agents, etc This level of sophistication led to impressive results in enhancement of hydrogen storage properties of metal hydrides by the use of mechanical milling. The main hurdle may be the high energy milling (power and time) which is most usually needed for improving metal hydride properties. This imposes additional requirements in terms of specific energy of the milling machine and size of batches that could be processed. These problems are compounded if the milling has to be performed under hydrogen pressure and at high temperature. Torsion (HPT) and Fast Forging (FF) are not considered here because at this moment very few investigations have been realized
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