Features of twist extrusion: Method, structures & material properties

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

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 um was produced in Cu billets by TE processing. The mechanical properties in copper billets are near their saturation after two TE passes through a 60° 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.

Details

Authors
  • Yan Beygelzimer
  • Dmitry Orlov
  • Alexander Korshunov
  • Sergey Synkov
  • Victor Varyukhin
  • Irina Vedernikova
  • Alexey Reshetov
  • Alexandr Synkov
  • Lev Polyakov
  • Irina Korotchenkova
External organisations
  • National Academy of Sciences of Ukraine
  • Russian Federal Nuclear Center VNIIEF
Research areas and keywords

Keywords

  • Grain refinement, Properties, Severe plastic deformation, Structure, Twist extrusion
Original languageEnglish
Title of host publicationSolid State Phenomena
PublisherTrans Tech Publications Ltd
Pages69-78
Number of pages10
Volume114
ISBN (Print)3908451221, 9783908451228
StatePublished - 2006
Peer-reviewedYes
Externally publishedYes
Event6th High Pressure School- Symposium I of the E-MRS Fall Meeting 2005 - Warsaw, Poland

Publication series

NameSolid State Phenomena
Volume114
ISSN (Print)10120394

Conference

Conference6th High Pressure School- Symposium I of the E-MRS Fall Meeting 2005
CountryPoland
CityWarsaw
Period2005/09/052005/09/09