Processing of Aluminium Alloys by Severe Plastic Deformation |
| Journal |
Materials Science Forum (Volumes 519 - 521) |
| Volume |
Aluminium Alloys 2006 |
| Edited by |
W.J. Poole, M.A. Wells and D.J. Lloyd |
| Pages |
45-54 |
| DOI |
10.4028/www.scientific.net/MSF.519-521.45 |
| Online since |
July, 2006 |
| Authors |
Terence G. Langdon
|
| Keywords |
Equal Channel Angular Pressing (ECAP), High Pressure Torsion (HPT), Severe Plastic Deformation (SPD), Strength, Superplasticity, Ultrafine Grained Material |
| Abstract |
Processing through the application of severe plastic deformation (SPD) has become
important over the last decade because it is now recognized that it provides a simple procedure for
producing fully-dense bulk metals with grain sizes lying typically in the submicrometer range.
There are two major procedures for SPD processing. First, equal-channel angular pressing (ECAP)
refers to the repetitive pressing of a metal bar or rod through a die where the sample is constrained
within a channel bent through an abrupt angle at, or close to, 90 degrees. Second, high-pressure
torsion (HPT) refers to the procedure in which the sample, generally in the form of a thin disk, is
subjected to a very high pressure and concurrent torsional straining. Both of these processes are
capable of producing metallic alloys with ultrafine grain sizes and with a reasonable degree of
homogeneity. Furthermore, the samples produced in this way may exhibit exceptional mechanical
properties including high strength at ambient temperature through the Hall-Petch relationship and a
potential superplastic forming capability at elevated temperatures. This paper reviews these two
procedures and gives examples of the properties of aluminum alloys after SPD processing. |
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