Micro-extrusion of ultrafine grained aluminium

A. Rosochowski, W. Presz, L. Olejnik, M. Richert

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

Microforming of normal, coarse grain (CG) metals leads to scale problems which originate from the fact that the grain size becomes comparable to the part size. A possible way of dealing with these problems is replacing CG metals with ultra-fine grained (UFG) metals. UFG metals can be produced in bulk by severe plastic deformation (SPD). This paper describes using UFG aluminium 1070 for preliminary trials of micro extrusion of a cylindrical cup. The process of producing bulk UFG aluminium by SPD is explained and the material obtained characterised. The preparation of micro billets for the extrusion operation is discussed. Backward extrusion is carried out for two types of material, CG and UFG. This enables a comparison of the material behaviour and product characteristics. Using UFG aluminium in microforming results in more uniform products with improved mechanical properties.
Original languageEnglish
Pages (from-to)137-146
Number of pages9
JournalInternational Journal of Advanced Manufacturing Technology
Volume33
Issue number1-2
DOIs
Publication statusPublished - 2007

Keywords

  • micro-extrusion
  • microforming
  • severe plastic deformation
  • ultra-fine grained metals
  • design engineering

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