Extrudability Improvement of 7000 Series Al Wrought Alloys by Thixoextrusion
The present study discussed extrudability improvement for 7000 series Al wrought alloys by thixoextrusion, with emphasis on controlling thixoextrusion parameters, such as initial ram speed, die bearing length and extrusion temperature of billet in semisolid state. The results of thixoextrusion exper...
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Veröffentlicht in: | Materials science forum 2007-05, Vol.544-545, p.319-322 |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The present study discussed extrudability improvement for 7000 series Al wrought alloys
by thixoextrusion, with emphasis on controlling thixoextrusion parameters, such as initial ram
speed, die bearing length and extrusion temperature of billet in semisolid state. The results of
thixoextrusion experiments about microstructures and extrusion pressures were compared with
conventional hot extrusion results. The maximum extrusion pressure for thixoextrusion was greatly
decreased than that of conventional hot extrusion. This will contribute to extrudability in terms of
extrusion pressure, which in turn means that shorter process time is required and smaller extrusion
machine can be applied for the same operation. It is also possible to make complex shape
components of 7000 series Al wrought alloys, which is not possible by conventional hot extrusion
processes. The elongated grains to extrusion direction were generally observed during conventional
hot extrusion, while the thixoextruded microstructures were isotropic. |
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ISSN: | 0255-5476 1662-9752 1662-9752 |
DOI: | 10.4028/www.scientific.net/MSF.544-545.319 |