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      Effect of Strain Heterogeneities on Microstructure, Texture, Hardness, and H-Activation of High-Pressure Torsion Mg Consolidated from Different Powders

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          Abstract

          Severe plastic deformation techniques, such as high-pressure torsion (HPT), have been increasingly applied on powder materials to consolidate bulk nanostructured materials. In this context, the aim of the present study is to compare the plastic deformation characteristics during HPT of two distinct Mg-based powder precursors: (i) atomized micro-sized powder and (ii) condensed and passivated nanopowder. Dynamic recrystallization could take place during HPT consolidation of the atomized powder particles while the oxide pinning of the grain boundaries restricted it for the condensed powder. Consequently, there have been substantial differences in the development of the microstructure, texture, local strain heterogeneities, and hardness in the two types of consolidated products. Different types of local strain heterogeneities were also revealed in the consolidated products. The associated diversity in microstructure within the same consolidated product has been demonstrated to have an effect on the hydrogen activation kinetics to form hydrides for these Mg-based materials that could be suitable for solid state H-storage applications.

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          Most cited references55

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          Using high-pressure torsion for metal processing: Fundamentals and applications

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            Dynamic and post-dynamic recrystallization under hot, cold and severe plastic deformation conditions

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              Producing bulk ultrafine-grained materials by severe plastic deformation

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                01 August 2018
                August 2018
                : 11
                : 8
                : 1335
                Affiliations
                [1 ]Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux (LEM3), Université de Lorraine, CNRS, Arts et Métiers ParisTech, LEM3, 57000 Metz, France; laszlo.toth@ 123456univ-lorraine.fr
                [2 ]Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures (DAMAS), Université de Lorraine, 57073 Metz, France; subrata.panda@ 123456univ-lorraine.fr
                [3 ]National Engineering Research Center of Light Alloy Net Forming & State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; zoujx@ 123456sjtu.edu.cn
                Author notes
                [* ]Correspondence: thierry.grosdidier@ 123456univ-lorraine.fr ; Tel.: +33-03-72-74-78-36
                Author information
                https://orcid.org/0000-0002-6441-5729
                https://orcid.org/0000-0001-7598-9026
                Article
                materials-11-01335
                10.3390/ma11081335
                6119929
                30071691
                54558b6f-e0e2-4cdf-87a6-f1a67424dfea
                © 2018 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 29 June 2018
                : 24 July 2018
                Categories
                Article

                magnesium powders,hpt consolidation,microstructure,hardness,h-activation

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