2018-Sustainable Industrial Processing Summit
SIPS2018 Volume 5. Zehetbauer Intl. Symp. / SISAM
| Editors: | F. Kongoli, S. Kobe, M. Calin, J.-M. Dubois, T. Turna |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2018 |
| Pages: | 154 pages |
| ISBN: | 978-1-987820-90-4 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Using High-pressure Torsion to Consolidate Magnesium Matrix Composites
Roberto Figueiredo1; Pedro Henrique Pereira1; Moara Castro1; Augusta Isaac Neta1; Terence G. Langdon2;1UNIVERSIDADE FEDERAL DE MINAS GERAIS, Belo Horizonte, Brazil; 2UNIVERSITY OF SOUTHAMPTON, Southampton, United Kingdom;
Type of Paper: Invited
Id Paper: 317
Topic: 42
Abstract:
The high compressive stresses imposed by high pressure torsion allows plastic deformation of machine chips and metallic particles until close contact is reached. The severe torsion straining provides the condition for "self-welding" of these particles, creating a continuous metallic matrix. This technique has been used to produce aluminum matrix composites [1, 2] and has also been used to consolidate magnesium particles [3]. Processing magnesium by high pressure torsion is especially interesting since it has been shown that it leads to exceptional ductility [4]. The present work describes the use of high-pressure torsion to consolidate magnesium with reinforcement phases into metal matrix composites. The microstructure of the composite was evaluated by scanning electron microscopy and the mechanical strength was estimated by microhardness testing. It is shown that a dense microstructure is attained after several turns of torsion, and the hardness of the processed composite is higher than the pure metal base. The present work shows that it is possible to improve magnesium strength by introducing hard phases during high pressure torsion consolidation of particles.
Keywords:
Severe Plastic Deformation (SPD); High pressure torsion; Magnesium; Ductility; Microstructure;References:
[1] T. Tokunaga, K. Kaneko, K. Sato, Z. Horita, Microstructure and mechanical properties of aluminum-fullerene composite fabricated by high pressure torsion, Scripta Materialia 58(9) (2008) 735-738.[2] T. Tokunaga, K. Kaneko, Z. Horita, Production of aluminum-matrix carbon nanotube composite using high pressure torsion, Materials Science and Engineering: A 490(1) (2008) 300-304.
[3] S. Panda, J.-J. Fundenberger, Y. Zhao, J. Zou, L.S. Toth, T. Grosdidier, Effect of initial powder type on the hydrogen storage properties of high-pressure torsion consolidated Mg, International Journal of Hydrogen Energy 42(35) (2017) 22438-22448.
[4] R.B. Figueiredo, S. Sabbaghianrad, A. Giwa, J.R. Greer, T.G. Langdon, Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation, Acta Materialia 122 (2017) 322-331.