Effect of cold rolling on the structure and hydrogen properties of AZ91 and AM60D magnesium alloys processed by ECAP. (24th August 2017)

• Record Type: Journal Article
• Authors: Jorge Jr., Alberto Moreira; Prokofiev, Egor; Triques, Maria Regina Martins; Roche, Virginie; Botta, Walter José; Kiminami, Claudio Shyinti; Raab, Georgy I.; Valiev, Ruslan Z.; Langdon, Terence G.
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 34(2017)
• Page Start: 21822
• Page End: 21831
• Publication Date: 2017-08-24
• Subjects: Equal-channel angular pressing -- Hydrogen storage -- Magnesium alloys -- Severe plastic deformation -- Ultrafine grains; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.07.118
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: This investigation was conducted to evaluate the effect of cold rolling on the structure and hydrogen properties of two magnesium alloys, AZ91 and AM60D, after processing by equal-channel angular pressing (ECAP). The results show that the use of cold rolling after ECAP significantly increases the preferential texture for hydrogenation and increases the potential for the use of these alloys as hydrogen storage materials. The ECAP was performed through two different numbers of passes in order to give different grain sizes and both materials were subsequently cold-rolled through the same numbers of passes for a comparison of the hydrogenation absorption. It is shown that the hydriding properties are enhanced by an (0001) texture which improves the kinetics primarily in the initial stages of hydrogenation. The results demonstrate that optimum sorption properties may be acquired through a combination of fine grains and appropriate texture. Highlights: Different routes for ECAP of Mg-alloys is used to produce ultrafine grains. Cold rolling produces different amounts of (002) texture in these Mg-Alloys. Different alloys produces different amounts of precipitates. Texture acting synergistically with grain size improves H-sorption properties. Second phases may be deleterious for the acquired capacity.