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Five-parameter intervariant boundary characterization of martensite in commercially pure titanium
journal contribution
posted on 2018-08-01, 00:00 authored by Ehsan Farabi, Peter HodgsonPeter Hodgson, G S Rohrer, Hossein BeladiHossein BeladiThe intervariant boundary characteristics of a commercially pure Ti microstructure formed by the β→α martensitic phase transformation were described according to the crystallography of the displacive transformation and the boundary plane orientation. The martensitic transformation created a microstructure whose grain boundary misorientation angle distribution had four distinct peaks that were consistent with the misorientations between the variants produced by the Burgers orientation relationship. Interestingly, about 60% of population corresponded to 60°/[112¯0] intervariant boundaries. Three-variant clusters with a triangular morphology were observed frequently. This configuration is consistent with the phenomenological theory of martensite, which predicts that these clusters, separated by 60°/[112¯0] boundaries, have a lower transformation strain than other possible variant cluster arrangements. Other intervariant boundaries resulted from the impingement of different combinations of distinct three-variant clusters. The five-parameter boundary analysis revealed a strong anisotropy in the plane orientation distribution, showing that boundaries have a tendency to terminate on prismatic {hki0} and pyramidal {101¯1} planes, when misorientation was ignored. The dominant 60°/[112¯0] intervariant boundaries had symmetric tilt (1¯101) boundary planes, which are a low energy configuration.
History
Journal
Acta materialiaVolume
154Pagination
147 - 160Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
1359-6454Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2018, Acta Materialia Inc.Usage metrics
Categories
Keywords
Pure titaniumMartensite transformationCrystallographyVariant selectionIntervariant boundary plane character distributionScience & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials ScienceBETA GRAIN-BOUNDARIESSELF-ACCOMMODATIONALPHA-PHASECRYSTALLOGRAPHIC PLANESENERGY-DISTRIBUTIONSTWIN BOUNDARIESTRANSFORMATIONSTEELDISLOCATIONSMechanical EngineeringCondensed Matter Physics
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