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Temperature dependence of strengthening mechanisms in the nanostructured ferritic alloy 14YWT: Part I

This paperpresentsexperimentalresultsonthemechanicalandmicrostructuralbehaviorsofthe nanostructuredferriticalloy14YWTandprovidesdiscussionrelevanttodeformationmechanismsover a widerangeoftemperature.Thetemperaturedependenceofstrengthwasinvestigatedoverawide temperaturerangeof 196 to1000 1C. Detailedmicrostructuralcharacterizationbeforeandafter deformationwasconductedtoobtainthekeyinformationondeformationmechanisms;microstruc- tural informationbeforeandaftertensiledeformation,includingcrystallographictexture,dislocation structures,andnanoclusters,wasobtainedfromthefocusedionbeamlift-outspecimensusingEBSD, TEM, andAPTtechniques.Multipledeformationstagescouldbeidentifiedintheyieldstrengthversus temperaturecurve.Thedislocationstructuresinthespecimensdeformedatroomtemperatureandat 900 1C werefoundtobesignificantlydifferent.EBSDresultswereusedtoelucidatechangesinthe crystallographictexturesofthespecimensbeforeandafterdeformationat900 1C.

Byun, Thak Sang↗