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Tension/compression asymmetry in additive manufactured face centered cubic high entropy alloy
journal contribution
posted on 2017-03-01, 00:00 authored by Jithin JosephJithin Joseph, N Stanford, Peter HodgsonPeter Hodgson, Daniel FabijanicDaniel FabijanicThe high entropy alloy, Al 0.3 CoCrFeNi, has been fabricated by direct laser fabrication and its deformation behaviour studied. This alloy exhibited significant tension/compression asymmetry in its work hardening rate and ductility. The exceptionally high work hardening in compression has been attributed to profuse mechanical twinning which has been exacerbated by a strong texture in the as-cast material. The tensile deformed material did not exhibit any mechanical twinning, deformed exclusively by slip, and therefore showed minimal work hardening and poor ductility. The critical resolved shear stress for twinning of the alloy was found to be approximately 240 MPa.
History
Journal
Scripta materialiaVolume
129Pagination
30 - 34Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
1359-6462Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2016, Acta MaterialaUsage metrics
Categories
Keywords
high entropy allowtwinningwork hardeningcritical resolved shear stress for twinningScience & TechnologyTechnologyNanoscience & NanotechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringScience & Technology - Other TopicsMaterials ScienceHigh entropy alloyMECHANICAL-PROPERTIESDEFORMATION-BEHAVIORGRAIN-ORIENTATIONTENSILEMICROSTRUCTURESDEPENDENCEDESIGNSTEELMechanical EngineeringCondensed Matter Physics
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