热处理对组织结构与磁致伸缩性能的影响

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1、热处理对Fe8Ga。合金组织结构与磁致伸缩性能的影响／马云庆等·5。EffectsofHeat-treatmentontheMicrostructureandMagnetostrictionofFes1Ga19MAYunqing，LAISanli，YANGShuiyuan，YANGJingjing，SHIZhan(DepartmentofMaterialsScienceandEngineering，CollegeofMaterials，XiamenUniversity，Xiamen361005)AbstractButtoningotsofpolyerysta

2、llineFeB1Gal9alloyarepreparedbyarc-melter，andtheeffectsofdifferentheat-treatmentsontheirmicrostructureandmagnetostrictionareinvestigated．Thespecimensareannealedat700℃。800~C，and900~C，andthencooledatdiferentspeeds，i．e．quenchingintoicewater，aircooling，orfurnacecooling．Theresultsshowth

3、atspecimensafterdifferentheat-treatmentsallexhibitsinglebccstructure，butthemagnetostric—tionsvaryfrom34×10一to94X10一；Whentheheatingtemperatureis800℃，goodmagnetostriction(88×10一)canbeobtainedbyquenching．Ontheotherhand，whenthespecimenisheatedatahighertemperature(900~C)，fur—nacecolingi

4、sabetterwaytogetgoodmagnetostriction(94×10一)．Itisspeculatedthattheheat-treatmenttempera-tureandthecrystalorientationmaybetwoprimaryfactorsinfluencingthemagentostrictionofFeBlGa19alloy．Keywordsmagnetostriction，lGal9，heat-treatment热处理对Fe8。Ga9合金组织结构与磁致伸缩性能的影响马云庆，赖三哩，杨水源，杨晶晶，施展(厦门大学材料学

5、院材料科学与工程系，厦门361005)摘要采用电弧熔炼法制备了。Ga1。舍金多晶样品，研究了不同热处理工艺对合金组织结构及磁致伸缩性能的影响。样品经过700℃、800℃和900℃保温后采用空冷、炉冷和淬火3种冷却方式。结果显示，经过不同热处理后样品的微观组织均为单相bcc结构，而磁致应变从34×10到94×1O不等；当热处理温度为800℃时，淬火处理后可获得较好的磁致伸缩性能(88×10)，而热处理温度较高(900℃)时，采用炉冷的方式可获得较好的磁致伸缩性能(94×10)。推测热处理方式和晶体取向对Fe81Gal。合金磁致伸缩性能有较重要的影响。关键词磁致

6、伸缩Fe81Ga19热处理Magnetostrictivematerialsexhibitreversiblestrainsinstrictionover200×10一isobtainedatroomtemperatureinthepresenceofmagneticfield[．Theyareusedtomakeva—relativelylowmagneticfieldbelowl5OmTinFeGasingle-riousactuatorsandsensors．Currentapplicationsofmagne—crystalwithGaconcent

7、rationbetween15atand25at％．tostrictivematerialsincludeultrasoniccleaners，highforceA1lthesepropertiesimpliedthattheFeGaalloysarepromis—linearmotors，positionersforadaptiveoptics，medicalandingnewgiantmagnet0strictivematerials[一．Atthesameindustrialultrasonics，pumps，andsonaretc．The·giant

8、time，itwasalsobeenreported