Features of Twist Extrusion: Method, Structures & Material Properties

Abstract:

During the last decade it has been shown that severe plastic deformation (SPD) is a very effective for obtaining ultra-fine grained (UFG) and nanostructured materials. The basic SPD methods are High Pressure Torsion (HPT) and Equal Channel Angular Extrusion (ECAE). Recently several new methods have been developed: 3D deformation, Accumulative Roll Bonding, Constrained Groove Pressing, Repetitive Corrugation and Straightening, Twist Extrusion (TE), etc. In this paper the twist extrusion method is analyzed in terms of SPD processing and the essential features from the “scientific” and “technological” viewpoint are compared with other SPD techniques. Results for commercial, 99.9 wt.% purity, copper processed by TE are reported to show the effectiveness of the method. UFG structure with an average grain size of ~0.3 μm was produced in Cu billets by TE processing. The mechanical properties in copper billets are near their saturation after two TE passes through a 60º die. Subsequent processing improves homogeneity and eliminates anisotropy. The homogeneity of strength for Cu after TE is lower than after ECAE by route BC, but higher than after ECAE by route C. The homogeneity in ductility characteristics was of almost of inverse character. The comparison of mechanical properties inhomogeneity in Cu after TE and ECAE suggests that alternate processing by ECAE and TE should give the most uniform properties.

• Periodical: Solid State Phenomena (Volume 114)
• Pages: 69-78
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.114.69
• Online since: July 2006
• Authors: Yan Beygelzimer, Dmitry Orlov, Alexander Korshunov, Sergey Synkov, Viktor Varyukhin, Irina Vedernikova, Alexey Reshetov, Alexandr Synkov, Lev Polyakov, Irina Korotchenkova
• Keywords: Grain Refinement, Property Analysis, Severe Plastic Deformation (SPD), Structure, Twist Extrusion

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