The development of a high strain rate superplastic Al-Mg-Zr alloy

R.J. Dashwood, R. Grimes, A.W. Harrison, H.M. Flower

Research output: Contribution to journalArticle

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Abstract

In order for superplastic forming of aluminium to break out of the niche market low cost alloys are required that exhibit higher strain rate capability that are capable of volume production. This paper describes an investigation into the feasibility of producing such an alloy. A series of Al-4Mg alloys with 0, 0.25, 0.5, 0.75 & 1% Zr additions was prepared using a cheap particulate casting route, in an attempt to achieve higher levels of Zr supersaturation than are possible with conventional casting. The particulate was processed into a sheet product via hot extrusion followed by cold rolling and the effect of a number of process variables on the SPF performance of the sheet was investigated. It was found that increasing the Zr content, and manipulation of the thermomechanical processing conditions improved the SPF performance. Ductilities in excess of 600% have been achieved at a strain rate of 0.01 s-1, together with flow stresses less than 15MPa.
Original languageEnglish
Pages (from-to)339-344
Number of pages6
JournalMaterials Science Forum
Volume357-359
DOIs
Publication statusPublished - 2001
EventSuperplasticity in Advanced Materials - Orlando, United States
Duration: 1 Aug 20004 Aug 2000

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