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Effect of cold rolling on the structure and hydrogen properties of AZ91 and AM60D magnesium alloys processed by ECAP |
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| Authors: | Alberto Moreira Jorge Jr. Egor Prokofiev Maria Regina Martins Triques Virginie Roche Walter José Botta Claudio Shyinti Kiminami Georgy I. Raab Ruslan Z. Valiev Terence G. Langdon |
| Affiliation: | 1. Department of Materials Engineering, Federal University of São Carlos, São Carlos, 13565-905, SP, Brazil;2. LEPMI Laboratory CNRS, UMR 5266 INPG – UJF, Grenoble, BP75, 38402, St-Martin D''Hères, France;3. SIMAP Laboratory CNRS, CNRS UMR 5266.INPG – UJF, Grenoble, BP75 – 38402, St-Martin D''Hères, France;4. Saint Petersburg State University, 28 Universitetsky Prospekt, Peterhof, Saint Petersburg, 198504, Russia;5. Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, 12 K. Marx Str., Ufa, 450000, Russian Federation;6. Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton, SO17 1BJ, UK |
| 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. |
| Keywords: | Equal-channel angular pressing Hydrogen storage Magnesium alloys Severe plastic deformation Ultrafine grains |
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