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The role of back-pressure in equal channel angular extrusion
journal contribution
posted on 2005-01-01, 00:00 authored by Rimma LapovokEqual Channel Angular Extrusion (ECAE), developed and patented in Russia by Segal in 1977, has become in the last few years a very popular tool for studying the evolution of microstructure and properties under severe plastic deformation. It is believed that the strain-stress characteristics are uniform in a cross-section of the billet and this uniformity of the stress-strain distribution ensures the uniformity of microstructure and mechanical properties in ECAE processed billet. However, some experimental data such as the fracture of the extruded billet, which is initiated at the inner surface of the sample, has caused doubts about uniformity of stress-strain distribution. This non-uniformity has been proved recently by Finite Element Simulation. This paper reviewed our results from over six years of work using a unique machine for ECAE with computer controlled back-pressure and velocity of the backward punch. Theoretically back-pressure has been introduced in the earlier papers of Segal. However, practically back-pressure has not been widely used or often used in a primitive form of the consequent extruded sample and its role has not been understood.
History
Journal
Journal of materials scienceVolume
40Issue
2Pagination
341 - 346Publisher
Kluwer Academic PublishersLocation
[Dordrecht, The Netherlands]Publisher DOI
ISSN
0022-2461eISSN
1573-4803Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2005, Springer Science + Business MediaUsage metrics
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