Influence of grain size on the compressive deformation of wrought Mg-3A1-1Zn

Barnett, Matthew, Keshavarz, Zohreh, Beer, Aiden and Atwell, Dale 2004, Influence of grain size on the compressive deformation of wrought Mg-3A1-1Zn, Acta Materialia, vol. 52, no. 17, pp. 5093-5103.

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Title Influence of grain size on the compressive deformation of wrought Mg-3A1-1Zn
Author(s) Barnett, MatthewORCID iD for Barnett, Matthew
Keshavarz, ZohrehORCID iD for Keshavarz, Zohreh
Beer, Aiden
Atwell, Dale
Journal name Acta Materialia
Volume number 52
Issue number 17
Start page 5093
End page 5103
Publisher Elsevier Science
Place of publication Tarrytown, NY ; Oxford, England
Publication date 2004-10
ISSN 1359-6454
Summary The influence of the grain size on the flow stress of extruded Mg–3Al–1Zn tested in compression is examined. Samples with grain sizes varying between 3 and 23 μm were prepared by altering the extrusion conditions. Compression testing of the extruded bar was carried out at temperatures between ambient and 200 °C. Twinning dominated the deformation at lower temperatures but this gave way to slip dominated flow when the temperature was raised. For tests carried out at intermediate temperatures, a similar transition was observed when the grain size was reduced. The transition was accompanied by a change in flow curve shape and Hall–Petch slope. The peak stresses achieved when twinning dominated the deformation were up to 100 MPa greater than those seen when slip dominated the flow. Critical grain sizes marking the twinning–slip transition were identified and these are described in terms of the deformation conditions.
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 ©2004, Elsevier Science
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