The manufacture of superplastic Magnesium alloy sheet

Abstract

Probably because of their propensity to dynamically recrystallise, superplastic behaviour can be obtained from magnesium alloys considerably more easily than from comparable aluminium alloys. In some cases even as cast magnesium alloys can exhibit reasonable superplasticity and there appears no need for the special alloying additions or complex thermal mechanical treatments required by aluminium alloys such as AA2004 or AA7475. The paper describes the superplastic behaviour (in uniaxial tension) and microstructure of sheet processed from strip cast AZ31 and AZ91. 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 strip cast AZ31 and AZ91 in the as cast condition. Furthermore good superplastic capability was also demonstrated in sheet rolled from the cast metal and the ductilities obtained were not significantly influenced by rolling strain. Twin roll strip casting represents a feasible and simple route for the production of superplastic material either for use in the as cast condition or after rolling to the required gauge.

Superplastic forming of magnesium alloys

“…He suggested that these results pointed to twin roll © Woodhead Publishing Limited, 2011 strip casting as being an obvious and relatively simple production route for the manufacture of superplastically deformable magnesium alloy strip. Follow-up work from Pong's observations by Grimes et al (2008) then examined the superplastic behaviour of twin roll cast samples of both AZ31 and AZ91. Good superplastic behaviour was obtained from both alloys whether they were simply in the as-strip cast condition or whether they had been subsequently warm rolled.…”

A 3D Finite Element Simulation of Cold Roll Forming of Wrought Magnesium Alloy Sheets

“…The major barrier to greatly increased magnesium alloy use has been in still primarily high manufacturing cost as well as its poorworkability of wrought magnesium sheet alloys [1][2][3]. Authors have been investigating into twin roll strip casting technology of magnesium alloy sheet which will enable manufacturers to use wrought magnesium alloy with reasonable manufacturing cost [4][5][6].…”

Aging Behavior of Semi-Solid Mg-10Al-0.3Mn Alloy by the Hot Extrusion

“…Hence, most studies on magnesium alloys have focused on the improvement of their formability and strength by controlling their microstructures by the regulating solidification rate and addition of a refiner. However, the study on their heat treatment was not enough [6][7][8][9]. Generally, it is possible to achieve high strengths in Mg-Al-Mn, Mg-Al-Zn, and Mg-RE based alloys by heat treatment.…”