Investigation of deformation twinning in a fine-grained and coarse-grained ZM20 Mg alloy: combined in situ neutron diffraction and acoustic emission

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dc.contributor.authorMuránsky, Oen_AU
dc.contributor.authorBarnett, MRen_AU
dc.contributor.authorCarr, DGen_AU
dc.contributor.authorVogel, SCen_AU
dc.contributor.authorOliver, ECen_AU
dc.date.accessioned2010-04-19T05:47:14Zen_AU
dc.date.accessioned2010-04-30T05:08:42Zen_AU
dc.date.available2010-04-19T05:47:14Zen_AU
dc.date.available2010-04-30T05:08:42Zen_AU
dc.date.issued2010-03en_AU
dc.date.statistics2010-03en_AU
dc.description.abstractNeutron diffraction and acoustic emission were used in a single in situ experiment in order to study the deformation twinning of two ZM20 Mg alloys with significantly different grain sizes at room temperature. The combination of these two techniques facilitates the distinction between twin nucleation and twin growth. It is shown that yielding and immediate post-yielding plasticity in compression along the extrusion direction is governed primarily by twin nucleation, whereas plasticity at higher strains is presumably governed by twin growth and dislocation slip. It is further shown that, in the fine-grained alloy, collaborative twin nucleation in many grains dominates yielding, whereas twin nucleation in the coarse-grained alloy is progressive and occurs over a larger strain range. In addition, it is shown that, despite twin nucleation stresses increasing with decreasing grain size, roughly the same overall volume fraction of twins is formed in both fine and coarse parent grains. This confirms the difficulty of the alternative deformation modes and suggests a negligible suppressive effect of grain size on twinning in the case of the strongly textured fine-grained alloy. The current results also show that twins in the coarse-grained alloy are born less relaxed with respect to surrounding polycrystalline aggregate than those in the fine-grained alloy. This is believed to lead to lower reversal stresses acting on twin grains in the coarse-grained alloy upon unloading and thus to less untwinning and thus to a smaller pseudoelastic-like hysteresis. © 2010, Elsevier Ltd.en_AU
dc.identifier.citationMuransky, O., Barnett, M. R., Carr, D. G., Vogel, S. C., & Oliver, E. C. (2010). Investigation of deformation twinning in a fine-grained and coarse-grained ZM20 Mg alloy: combined in situ neutron diffraction and acoustic emission. Acta Materialia, 58(5), 1503-1517. doi:10.1016/j.actamat.2009.10.057en_AU
dc.identifier.govdoc1560en_AU
dc.identifier.issn1359-6454en_AU
dc.identifier.issue5en_AU
dc.identifier.journaltitleActa Materialiaen_AU
dc.identifier.pagination1503-1517en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.actamat.2009.10.057en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3209en_AU
dc.identifier.volume58en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectNeutron diffractionen_AU
dc.subjectAcoustic emission testingen_AU
dc.subjectMagnesiumen_AU
dc.subjectDeformationen_AU
dc.subjectTwinningen_AU
dc.subjectNucleationen_AU
dc.titleInvestigation of deformation twinning in a fine-grained and coarse-grained ZM20 Mg alloy: combined in situ neutron diffraction and acoustic emissionen_AU
dc.typeJournal Articleen_AU
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