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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<1?0>mo
