AComparisonoftheElectronandIonIrradiationEffectsonthe：在电子和离子束辐照效应的比较

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1、ACOMPARISONOFTHEELECTRONANDIONIRRADIATIONEFFECTSONTHESTABILITYRANGEOFORDEREDSTRUCTURESINNi4MoM.SUNDARARAMAN*andS.BANERJEEPresentedbyG.K.DEYMaterialsScienceDivisionBhabhaAtomicResearchDivisionMumbai400085*email:msraman@apsara.barc.ernet.inOutlineOrdering–chemical,magnetic,&electricEvolutionofOr

2、deringCompetingsuperlatticesinNi4MoalloyInfluenceofradiationonorderdisorderOrderevolution--underelectronirradiation--underheavyionirradiationComparisonofelectronandionirradiationresultsConclusionsOrdering–Chemical,ferromagnetic,ferroelectricChemicalOrderingFerromagneticFerroelectricOrderingEm

3、ptylatticeAtomsA&BElectric/magneticmomentsOutlineOrdering–chemical,magnetic,&electricEvolutionofOrderingCompetingsuperlatticesinNi4MoalloyInfluenceofradiationonorderdisorderOrderevolution--underelectronirradiation--underheavyionirradiationComparisonofelectronandionirradiationresultsConclusion

4、sEvolutionoforderNucleationandGrowthContinuousOrderingOrderevolutioncouldbeeitherfirstorsecondorderEvolutionofOrdering:DiscreteMode(Nucleation&Growth)NucleationDisorderedMatrixEvolutionofOrdering–StaticConcentrationWavesSingleVariant<100>Kvector–B2Ordering3variants<100>Kvector–L12orderingConti

5、nuousOrderingAmplificationofconcentrationwavewithtimeFirst&secondordertransitions:Thermodynamicviewpointnthordertransformation:FECpTemperatureFirstOrderSecondorderEnergybarrierNucleation&growthFirst&secondordertransitions:LandauPlotsFirstOrder(Discrete)Secondorder(Continuous)OutlineOrdering–c

6、hemical,magnetic,&electricEvolutionofOrderingCompetingsuperlatticesinNi4MoalloyInfluenceofradiationonorderdisorderOrderevolution--underelectronirradiation--underheavyionirradiationComparisonofelectronandionirradiationresultsConclusionsOrderedStatesinNi4Mo*Above1140KalloyisinSROstate*Below1140

7、KalloyisinLROstate*Byconventionalsolutionisingandquenchingtreatmentalloycannotbeproducedinthecompletelydisorderedstate(CDO)*LROandSROaretwodifferentstatesDescriptionofLROandSROstructures[001]ProjectionLROstateSROstatep=0,1,2,3for<1½0>mo