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1、Vol463
2、21January2010
3、doi:10.1038/nature08692LETTERSStrongcrystalsizeeffectondeformationtwinning11,234111,5QianYu,Zhi-WeiShan,JuLi,XiaoxuHuang,LinXiao,JunSun&EvanMa1–67,8,21–24Deformationtwinningincrystalsisahighlycoherentinelasticmicrometres.Itistheninterestingtoseewhatwillhappenshe
4、aringprocessthatcontrolsthemechanicalbehaviourofmanywhenthesampledimensionsarereducedtothesamescaleorevenmaterials,butitsoriginandspatio-temporalfeaturesareshroudedsmaller.inmystery.Usingmicro-compressionandinsitunano-compressionWeusedabulksquareTi–5at.%Alsinglecrystalasthestartinge
5、xperiments,herewefindthatthestressrequiredfordeforma-material,fromwhichallthesamplesinthisstudywerecut.ThetiontwinningincreasesdrasticallywithdecreasingsamplesizeofexperimentaldetailsaredescribedintheMethodsandinthe7,8atitaniumalloysinglecrystal,untilthesamplesizeisreducedSupplement
6、aryInformation.SupplementaryFig.2showsthebeha-toonemicrometre,belowwhichthedeformationtwinningisviourofthebulksinglecrystalunder[0001]compression.Profuse24entirelyreplacedbylesscorrelated,ordinarydislocationplasticity.deformationtwinningisseen,inagreementwiththeliterature.InAccompan
7、yingthetransitionindeformationmechanism,themicro-compressiontestsofpillarswithd$1.0mm,almostallthemaximumflowstressofthesubmicrometre-sizedpillarswasdeformedsamplesshowedobviousshearingtracesonthesurfaces.9,10observedtosaturateatavalueclosetotitanium’sidealstrength.Examplesareshowni
8、nFig.1aandb.AtraceanalysisoftheWedevelopa‘stimulatedslip’modeltoexplainthestrongsized51.0mmmicro-pillarshowedthattheshearingoccurredonthedependenceofdeformationtwinning.Thesamplesizeintransi-{11222}plane,whichisacommontwinningplaneinhexagonal-close-tionisrelativelylargeandeasilyacc
9、essibleinexperiments,makingpackedTianditsalloys.Electronbackscatterdiffraction(EBSD)11–17ourunderstandingofsizedependencerelevantforapplications.analysisofthesedeformedpillarsprovidesevidencethatdeformationExplosivegrowthintheuseofsmall-volumematerialssuchastwinningindeedoccurreddur
10、ingcompression.Figu
