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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 Lapovok
Equal 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 science

Volume

40

Issue

2

Pagination

341 - 346

Publisher

Kluwer Academic Publishers

Location

[Dordrecht, The Netherlands]

ISSN

0022-2461

eISSN

1573-4803

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2005, Springer Science + Business Media