Twinning-detwinning behavior during fatigue-crack propagation in a wrought magnesium alloy AZ31B

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dc.contributor.authorWu, Wen_AU
dc.contributor.authorLee, SYen_AU
dc.contributor.authorParadowska, AMen_AU
dc.contributor.authorGao, Yen_AU
dc.contributor.authorLiaw, PKen_AU
dc.date.accessioned2014-04-24T04:36:54Zen_AU
dc.date.available2014-04-24T04:36:54Zen_AU
dc.date.issued2012-10-30en_AU
dc.date.statistics2014-04-24en_AU
dc.description.abstractIn-situ neutron diffraction was used to investigate the twinning and detwinning behavior during fatigue-crack propagation on a wrought magnesium alloy, AZ31B, compact-tension specimen, where fatigue loading was applied parallel to the plate normal. Reversible twinning and detwinning characteristics were observed as a function of the distance from the crack tip. While twinning was activated above a certain critical stress value, detwinning occurred immediately upon unloading. It is thought that the development of compressive residual stresses generated around the crack tip during unloading is responsible for the detwinning behavior. Neutron bulk texture measurements were performed at several locations away from the crack tip (i.e. locations behind, right in front of, and far away from the crack tip) to quantitatively examine the volume fraction of {10.2}< 10.1 > extension twins in the vicinity of the crack tip. The texture analyses demonstrated that the texture in the fatigue-wake region did not change significantly, compared to that in the undeformed region far away from the crack tip, and approximately 11% of the residual twins were left behind the crack tip. The current results reveal that the reversible twinning and detwinning are the dominant deformation mechanisms for the studied material subjected to cyclic loading, and only a small amount of residual twins remain after the crack propagation. The spatial distribution of twinning/detwinning transitions correlates well with our previous predictions of the stress fields in the vicinity of a fatigue crack tip. © 2012, Elsevier Ltd.en_AU
dc.identifier.citationWu, W., Lee, S. Y., Paradowska, A. M., Gao, Y., & Liaw, P. K. (2012). Twinning-detwinning behavior during fatigue-crack propagation in a wrought magnesium alloy AZ31B. Materials Science and Engineering: A, 556, 278-286. doi:10.1016/j.msea.2012.06.088en_AU
dc.identifier.govdoc5138en_AU
dc.identifier.issn0921-5093en_AU
dc.identifier.journaltitleMaterials Science and Engineering: Aen_AU
dc.identifier.pagination278-286en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.msea.2012.06.088en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5484en_AU
dc.identifier.volume556en_AU
dc.language.isoenen_AU
dc.publisherElsevier Science SAen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectNeutronsen_AU
dc.subjectAlloysen_AU
dc.subjectMagnetismen_AU
dc.subjectStressesen_AU
dc.subjectTwinningen_AU
dc.subjectFatigueen_AU
dc.subjectGrowthen_AU
dc.subjectStrainsen_AU
dc.subjectDeformationen_AU
dc.subjectTextureen_AU
dc.subjectAnisotropyen_AU
dc.subjectMetalsen_AU
dc.titleTwinning-detwinning behavior during fatigue-crack propagation in a wrought magnesium alloy AZ31Ben_AU
dc.typeJournal Articleen_AU
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