Construction of extrusion limit diagram for AZ31 magnesium alloy by FE simulation

Lapovok, R., Barnett, Matthew and Davies, C. H. J. 2004, Construction of extrusion limit diagram for AZ31 magnesium alloy by FE simulation, Journal of materials processing technology, vol. 146, no. 3, pp. 408-414.

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Title Construction of extrusion limit diagram for AZ31 magnesium alloy by FE simulation
Author(s) Lapovok, R.
Barnett, Matthew
Davies, C. H. J.
Journal name Journal of materials processing technology
Volume number 146
Issue number 3
Start page 408
End page 414
Publisher Elsevier SA
Place of publication Aedermannsdorf, Switzerland
Publication date 2004-03-10
ISSN 0924-0136
1873-4774
Keyword(s) extrusion limit diagram
AZ31 magnesium alloy
FE simulation
Summary The maximum speed at which magnesium can be extruded is considerably slower than that of many common aluminium extrusion alloys. This affects both the economies of production and the final mechanical behaviour. The present work quantifies the limiting extrusion speeds and ratios of magnesium alloy AZ31 as a function of billet temperature. This is done by combining hot compression test results, FE simulations and extrusion trials. Hot working stress–strain curves displayed a distinct dynamic recrystallisation peak. These data were used as a “look-up” table for the FE simulations in which the cracking limit was assumed to occur when the surface temperature reaches the incipient melting point. The maximum extrusion ratio predicted using FE analysis dropped from 90 to 40 when the extrusion ram speed was raised from 5 to 50 mm/s. The predicted limits agree well with the occurrence of cracking in both a laboratory and a commercial extrusion trial.
Notes Available online 23 January 2004.
Language eng
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2003, Elsevier B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008746

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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