Abstract
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.
