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Influence of grain size on the compressive deformation of wrought Mg-3A1-1Zn
journal contribution
posted on 2004-10-01, 00:00 authored by Matthew BarnettMatthew Barnett, Zohreh Keshavarz, Aiden BeerAiden Beer, Dale AtwellThe 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.
History
Journal
Acta MaterialiaVolume
52Issue
17Pagination
5093 - 5103Publisher
Elsevier ScienceLocation
Tarrytown, NY ; Oxford, EnglandISSN
1359-6454eISSN
1873-2453Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2004, Elsevier ScienceUsage metrics
Categories
Keywords
Science & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials Sciencewarm workingcompression testmagnesium alloystwinninggrain sizeSTACKING-FAULT ENERGYMAGNESIUM ALLOYMECHANICAL-BEHAVIORPLASTIC-DEFORMATIONSTRAIN COMPRESSIONTENSILE PROPERTIESMODELSLIPZIRCONIUMMGMechanical EngineeringCondensed Matter Physics
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