DOE OSTI2013
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.