Dashwood, R. J., Klaumunzer, David, Jackson, Martin, Fan, Zhongyun and Grimes, Roger. (2010) The development of superplastic magnesium alloy sheet. Key Engineering Materials, Vol.433 . pp. 273-279. ISSN 1013-9826

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Abstract

While magnesium alloys are routinely used in engineering applications in the form of net shape castings, applications for sheet product have been limited due to the poor cold formability of magnesium combined with the perceived expense of sheet. The issues associated with poor cold formability could largely be overcome if magnesium alloys were to be superplastically formed. Superplasticity in magnesium is well established with research papers on the subject dating back to the late 1960s. In recent years, interest in this area has grown to the point where a number of companies have successfully superplastically formed prototype automotive panels from magnesium alloy sheet. Concurrent to this the scientific community have demonstrated superplasticity in a wide range of magnesium alloys using processing techniques ranging from the exotic (severe plastic deformation) to the mundane (traditional warm rolling). Work by the current authors has shown, rather surprisingly, that superplasticity can be achieved in magnesium alloys in the as-cast condition. This has led to some initial exploratory work involving twin roll casting. The concept being that affordable superplastic magnesium sheet could be produced via twin roll casting with only limited rolling reduction to final gauge. This paper describes the superplastic behaviour (in uniaxial tension) and microstructure of sheet processed from strip cast AZ31 and AZ91. The experimental material has included strip cast AZ91 subjected to large shear strains immediately prior to casting. The material was tested in the as-cast condition and after warm rolling to a number of gauges. Industrially useful superplastic capability was demonstrated in the strip cast alloys. Furthermore, good superplastic capability was also demonstrated in sheet subsequently rolled from the cast metal and rolling strain did not significantly influence the ductilities obtained. The mechanism for achieving superplasticity in as-cast magnesium alloys will be considered and the contrasting deformation characteristics of AZ31 and AZ91 will be discussed in terms of m value analysis and microstructural characterisation.

Item Type:	Journal Article
Subjects:	T Technology > TP Chemical technology T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Series Name:	Key Engineering Materials
Journal or Publication Title:	Key Engineering Materials
Publisher:	Trans Tech Publications Ltd
ISBN:	*****************
ISSN:	1013-9826
Editor:	Sanders, DG
Date:	2010
Volume:	Vol.433
Number of Pages:	7
Page Range:	pp. 273-279
Identification Number:	10.4028/www.scientific.net/KEM.433.273
Status:	Not Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Version or Related Resource:	This item was originally delivered as a keynote at the 10th International Conference on Superplasticity in Advanced Materials, ICSAM 2009, Bell Harbor International Conference Center, Seattle, U.S.A., Jun 29 - Jul 2, 2009, edited by Daniel G. Sanders.
Title of Event:	10th International Conference on Superplasticity in Advanced Materials
Location of Event:	Seattle, WA
Date(s) of Event:	June 29 -July 02, 2009
URI:	http://wrap.warwick.ac.uk/id/eprint/5524

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