4M Knowledge base - papers

Micro-extrusion of ultra-fine grain aluminium
A. Rosochowski (a), W. Presz (b), L. Olejnik (b), M. Richert (c)
a Design, Manufacture and Engineering Management, University of Strathclyde, Glasgow G1 1XJ, UK
b Institute of Materials Processing, Warsaw University of Technology, 02-524 Warsaw, Poland
c Faculty of Non-Ferrous Metals, AGH University of Science and Technology, 30-059 Krakow, Poland

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 grain (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.