Angular Extrusion of Double-Metal Ingot |
| Journal |
Materials Science Forum (Volumes 584 - 586) |
| Volume |
Nanomaterials by Severe Plastic Deformation IV |
| Edited by |
Yuri Estrin and Hans Jürgen Maier |
| Pages |
74-79 |
| DOI |
10.4028/www.scientific.net/MSF.584-586.74 |
| Online since |
June, 2008 |
| Authors |
Jan T. Bonarski,
Jan Pospiech,
L. Tarkowski,
Jan Kuśnierz
|
| Keywords |
Crystallographic Texture, Double-Metal ECAP, Mg-Alloy, Severe Plastic Deformation (SPD) |
| Abstract |
Relatively high mechanical strength and simultaneously good plasticity of a crystalline
material are determined by the state of its internal structure, preferably nano- or ultra-fine grained
one. To achieve the above combination of properties, various manners of plastic deformation and
heat treatment are applied in practice. One of the most effective processes in this field is severely
plastic deformation, e.g. by the method of equal angular channel pressing (ECAP). During the
ECAP, favourable effects of grain fragmentation and the formation of specific orientation relations
can be attenuated by the process of structure recovery, especially, when the real temperature of
angular extrusion is elevated for physical or technological reasons.
An attempt to modify the ECAP technology was considered, to avoid the unfavourable temperature
effects and to increase at the same time the efficiency of manufacturing the ultra-fine structure of
material. Extrusion of dual-material (AZ31 + Al) ingot was performed at room temperature. As it
seems, the well known difficulties with plastic deformation of materials with hexagonal lattice
symmetry, like AZ31 alloy, have been decreased.
Both experimental and methodological aspects of the angular extrusion of the dual-material ingot
and chosen microstructure characteristics (texture, stress, morphology) are presented. On the basis
of the suggested modification, the text discusses an explanation of physical origins of the
microstructure evolution in the investigated material revealed by experiments. |
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