1、大連理工大學碩士學位論文Zr基大塊非晶合金弛豫和晶化過程研究姓名：李霞申請學位級別：碩士專業(yè)：材料學指導教師：齊民20020301AbstractAbstractBulkamorphousalloyshavemanyexcellentmechanicaIpropertiessuchashighstrength，wearresistancecorrosionresistanceandsoftmagnetizationSotheyhaveb

2、rightfuturewiththeapplicationsinelectronicmechanicaandchemicaIfieldsRecentlymanyresearchesarefocusedonpreparingbulkamorphousalloysAmorphousalloyswillIOSSmanygoodpropertiesaftercrystallizationHoweverpartlycrystallizationo

3、falloyswillgainsomeusefuImicrostructuresTherelaxationprocesswillInfluencetheglasstransitionandcrystallizationofamorphousalloysinsomesenseInthispapertheprocessesofrelaxationandcrystallizationofamo幣housalloysareinvestigate

4、dinordertohelppreparebulkamorphousalloysZr—AINi—CUbasedalloysarechosenastheexperimentaIalloysbecauseoftheirstrongabilitytoformamorphousalloysandtheirthermaIstabilityTherelaxationandcrystallizationprocessesofbulkamorphous

5、alloysarestudiedbydynamicmechanicaianalyzer(DMA)，dliferentialscanningcalorimetry(DSC)，Xraydiffraction(XRD)andtransmissionelectronmicroscopy(TEM)，Inthepaperthejnfluenceoftherelaxationprocessonthestabilityofamorphousalloys

6、atatemperatureIowerthanTaiSstudiedTheexperimentaIresultsshowthat：continuallyheated，theactivationenergYfortheglasstransitionofrelaxedZr62A18Nil3Cul7ishigherthanthatofas—quenchedoneAndheatedatafixedtemperaturetheincubation

7、timeofrelaxedZre2AleNi_fsCul7jslongerthanthatofas—quenchedoneThereforeaconclusioncouldbedrawnthat，atthistimetherelaxationprocesshererestrainsthecrystallizationoftheamorphousalloysMoreovertheInfluenceofthedynamiclcadonthe

8、crystallizationiSstudiedtheexperimentalresultsshowthattheapplieddynamicIcadshortenstheincubationtimeandaccelerateSthecrystallizationprocessofamorphousalloys，InthepaperfheadvantagesanddisadvanlaaesOfDMAandDSCarealsocompar

9、ed：theresuItsshowthatDMAiSmoresensitivethanDSCfbrmeasuringphasetransformationsInaddition。theinfluenceofthefrequencyandquantityofthedynamicIcadontherelaxationandcrystallizationprocessofamorphousalloysiSstudied；theresultss

10、howthatthestoragemodulusofZr62AloNil3Cul7amorphousalloysdecreaseswiththedecreasingofthefrequency；thedropofIhefrequencyacceleratesthecrystallizationprocess：thefrequencyandquantityofthedynamiclcadinfluencestheshapeandsizeo