Paper Title:
A New Bulk Deformation Method – Cyclic Extrusion
  Abstract

Cyclic extrusion is a new bulk deformation method. It consists of two steps. In the first step a part of the work piece will be indirectly extruded. In the second step the extruded part will be backwards pressed into the bulk again so that the original shape of the work piece is retained. Similar to ECAP, cyclic extrusion can be repeated many times without shape change. On the other hand, cyclic extrusion can be applied locally on a work piece so that local grain refining or work hardening is possible. Magnesium alloy AZ31 was cyclically extruded at 400 °C with different tools. The grain size was refined from 800 +m to 15 +m. The local grain refining in the surface zone with cyclic extrusion improved the rollability of cast AZ31. Pure aluminium specimens were cyclically extruded up to 2.5 times, which corresponds to a deformation degree of -7. The microstructure changes were examined with EBSD.

  Info
Periodical
Materials Science Forum (Volumes 546-549)
Edited by
Yafang Han et al.
Pages
2293-2300
DOI
10.4028/www.scientific.net/MSF.546-549.2293
Citation
J. Zhang, "A New Bulk Deformation Method – Cyclic Extrusion", Materials Science Forum, Vols. 546-549, pp. 2293-2300, 2007
Online since
May 2007
Authors
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Price
$32.00
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