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Twinning and the ductility of magnesium alloys Part II. “Contraction” twins
Magnesium and its alloys do not in general undergo the same extended range of plasticity as their competitor structural metals. The present work presents part II of a study that examines some of the roles deformation twinning might play in the phenomenon. A series of tensile and compression tests results are reported for common wrought alloys: AZ31, ZK60 and ZM20. These data are combined with EBSD analysis and simple flow stress models to argue the following: (i) that “contraction” double twinning (which enables contraction along the c axis) can decrease the uniform elongation, and (ii) that compression double twinning can also account for shear failure at low strains. The last of these is described as a combined consequence of strain softening of the continuum and the local generation of twin sized voids.
History
Journal
Materials Science and Engineering A: Structural Materials: Properties, Microstructures and ProcessingVolume
464Issue
1-2Pagination
8 - 16Publisher
Elsevier B.V.Location
Amsterdam, The NetherlandsPublisher DOI
ISSN
0921-5093eISSN
1873-4936Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2007, Elsevier B.V.Usage metrics
Keywords
tensile testductilitywork softeningtwinningScience & TechnologyTechnologyNanoscience & NanotechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringScience & Technology - Other TopicsMaterials SciencePLANE-STRAIN COMPRESSIONROOM-TEMPERATUREMG ALLOYSDEFORMATIONFRACTUREMECHANISMCRYSTALSBEHAVIORMICROSTRUCTURESPLASTICITYMechanical Engineering
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