Ni54Mn25Ga15Al6高温形状记忆合金的微观组织和相变行为.pdf

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1、Availableonlineat、^n^n^，．sciencedirect．commTransactionsof姆ScienceDirectNonferrousMetals蠹SocietyofChinaELs】三VIERPressTrans．NonferrousMet．Soc．China24(2014)126—130WWW．tnmsc．cnMicrostructureandtransformationbehaviorofNi54MnzsGalsA16high—temperatureshapememoryalloyYanX1N，

2、YanLI1．SchoolofEnergy,PowerandMechanicalEngineering，NorthChinaElectricPowerUniversity,Beijing102206，China；2．SchoolofMaterialsScienceandEngineering，BeihangUniversity,Beijing100191，ChinaReceived11December2012；accepted13April2013Abstract：Themicrostructure．martensitictra

3、nsformationbehavior,mechanicalpropertiesandshapememoryefectofNi54Mn25Gal5A16high·temperatureshoememoryalloywereinvestigated．BycomparingwiththeNi54Mn25Ga21alloy,theeffectofAladditiononthepropertiesofNi—Mrr_Gaalloyswasanalyzed．TheresultsshowthattheNi54Mn25Ga1A16alloyha

4、sasingle—phasetetragonalnon．modulatedmartensitestructurewithlamellartwinsThemartensitictransformationstarttemperatureofthisalloyisupto190。C．displayingthepromisingapplicationasahigh—temperatureshapememoryalloy．AladditioninNi-Mn-Gaalloycandecreasethemartensitictransfor

5、mationtemperaturesduetothee岱：ctofsizefactorandimprovethestrengthandplasticity．However,theshapememoryefectisreducedremarkablywiththeA1addition．Kevwords：shapememoryalloy；Ni—Mn—Ga：Aladdition；martensitictransforillationTherodsamplepreparedbyLletal[8]showedthat1Introdueti

6、ongrainrefinementisanefectivemethodtoimprovethemechanicalandshapememorycharacteristicsOfInthelastdecade，Ni7MnGaferromagneticshapeNi54Mn25Ga21alloys．Thecompressivestrengthandmemoryalloyshavebeenextensivelyexploredascompressivestrainofthebuttonsampleare440MPaandcandida

7、tesformagneticactuatormaterialsduetotheir10％，respectively,andthecorrespondingvaluesofthelargemagnetic-field—inducedstrains[卜4]．Meanwhile，rodsampleare970MPaandl6％．respectively．Onthethesealloysalsoundergoathermoelasticmartensiticotherhandmanyefortshavebeenmadetoimprove

8、thetransformationundercooling．IthasbeendemonstratedplasticityOfNi—Mn—Gaalloybyaddingthefourthtllatthemartensitictransformationtempe