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1、Availableonlineatwww。sciencedirect．com‰Transactionsof酶：ScienceDirectNonferrousMetalsSocietyofChinaELs】三VIERPressTrans．NonferrousMet．Soc．China23(2013)2896—2904www．mmsccnKineticgraingrowth，shapememoryandcorrosionbehavioroftwoCu—basedshapememoryalloysafterth
2、ermomechanicaltreatmentAhmadOstovariMOGHADDAM，MostafaKETABCHI，RezaBAHRAMIDepartmentofMiningalldMetallurgicalEngineering，AmirkabirUniversityofTechnology,Tehran，IranReceived13September2012；accepted13December2012Abstract：Metallurgicalandmechanicalpropertiesa
3、longwithshapememoryandcorrosionbehaviorofCu一11．8％AI一3．7％Ni—1％MnandCu_11％A15．6％Mnshapememoryalloys(SMAs)werecomparativelystudied．Theinfluenceofgrainrefinementonthepropertieswasstudiedbyopticalmicroscopy(OM)，scanningelectronmicroscopy(SEM)，differentialscann
4、ingcalorimetry(DSC)，potentiodynamicpolarizationsandbendandtensiletests．Staticrecrystallizationandkineticgraingrowthshowarapidrecrystallizationinthefirst15sofannealingat800。Cfollowedbygraingrowths．Theminimumgrainsizesobtainedafter15sare90and260gmforCu—Al—N
5、i—MnandCu—Al—Mn．respectively．Tensiletestsshowtypicalthree—stagecurvesforbothalloys，anditisseenthatalloysexhibithighfracturestressandstrainaftergrainrefinement．Microstmcturalobservationsshowzig—zagmorphologyofmartensiteintheCu—A卜Ni—Mnandcoexistenceofandint
6、heCu—A卜Mn，whichwereconfirmedbydiferentialscanningcalorimetryresults．Theshapememoryratios(卵．ofthealloysbeforethermomechanicaltreatment，andafterthermomechanica1annealingat800。Cfordifierenttimeupto15minfollowedbywaterquenching，wereevaluated．Inaddition，corosi
7、onbehaviorofalloysaftergrainrefinementwasanalyzedbymeansofpotentiodynamicpolarizationmeasurements．Theresultsshowedthattheanodicreactionsweredominatedbydissolutionofcopper,andCu—A卜Ni-MnalloyexhibitsabettercorosionresistancethanCu—A1一Mnalloy．Keywords：shapem
8、emoryalloys(SMAs)；grainrefinement；corrosion；shapememorypropertieselasticstifiness)whichleadstostressconcentrationat1Introductiongrainboundaries[4]．Thetypicallylargegrainsizesofthe一phaseinthesealloysintensifythistend
