On the correlation between deformation twinning and Lüders-like deformation in an extruded Mg alloy: in situ neutron diffraction and EPSC.4 modelling

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dc.contributor.authorMuránsky, Oen_AU
dc.contributor.authorBarnett, MRen_AU
dc.contributor.authorLuzin, Ven_AU
dc.contributor.authorVogel, SCen_AU
dc.date.accessioned2010-04-12T23:20:58Zen_AU
dc.date.accessioned2010-04-30T05:08:24Zen_AU
dc.date.available2010-04-12T23:20:58Zen_AU
dc.date.available2010-04-30T05:08:24Zen_AU
dc.date.issued2010-03-15en_AU
dc.date.statistics2010-03-15en_AU
dc.description.abstractThe current work focuses on the yielding and immediate post-yielding deformation of fine-grained and coarse-grained ZM20 Mg alloys obtained by extrusion. Compressive deformations along the extrusion direction, known to be governed by profuse twinning are examined in detail. It is shown that the fine-grained alloy exhibits Lüders-like plateaux suggesting heterogeneous transition from elastic to plastic deformation. This is due to the cooperative twinning of neighbouring grains which is promoted in the fine-grained alloy by the high internal stresses borne by the parent grain families in the vicinity of yielding, and the auto-catalytic nature of twin nucleation. The elasto-plastic response of tested alloys was also simulated using version 4 of the Elasto-Plastic Self-Consistent (EPSC) model. The finite initial fraction (FIF) assumption is employed to account for the stress relaxation related to the twin nucleation process. It is shown that the new EPSC.4 model is superior to its previous version as it enables realistic predictions of the development of elastic lattice strains in variously oriented grain families and the macroscopic stress–strain response of a polycrystalline aggregate undergoing profuse twinning. © 2009, Elsevier Ltd.en_AU
dc.identifier.citationMuransky, O., Barnett, M. R., Luzin, V., & Vogel, S. (2010). On the correlation between deformation twinning and Lüders-like deformation in an extruded Mg alloy: in situ neutron diffraction and EPSC.4 modelling. Materials Science and Engineering: A - Structural Materials Properties Microstructure and Processing, 527(6), 1383-1394. doi:10.1016/j.msea.2009.10.018en_AU
dc.identifier.govdoc1540en_AU
dc.identifier.issn0921-5093en_AU
dc.identifier.issue6en_AU
dc.identifier.journaltitleMaterials Science and Engineering: A - Structural Materials Properties Microstructure and Processingen_AU
dc.identifier.pagination1383-1394en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.msea.2009.10.018en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3149en_AU
dc.identifier.volume527en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectNeutron diffractionen_AU
dc.subjectTwinningen_AU
dc.subjectDeformationen_AU
dc.subjectMagnesium alloysen_AU
dc.subjectSimulationen_AU
dc.subjectStrainsen_AU
dc.titleOn the correlation between deformation twinning and Lüders-like deformation in an extruded Mg alloy: in situ neutron diffraction and EPSC.4 modellingen_AU
dc.typeJournal Articleen_AU
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