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1、西安理工大学硕士学位论文(5)Afteronestepagingandtwostepagingtreatment,theelectricalconductivityincreasessharplyandthenincreasesslowlyforCu-3Ti-xNi(x=1,3,5)alloys.Afteroveragingtreatment,theelectricalconductivityofCu-3Ti-1Nialloyincreasesslowly,theelectricalconductivityofCu-3Ti
2、-3Nialloydecreasesslightly,whiletheelectricalconductivityofCu-3Ti-5Nialloydecreasessharply.(6)ThepeakhardnessofagedCu-3Ti-1NialloyislargerthanthatofCu-3Ti-3NiandCu-3Ti-5Nialloys,buttheelectricalconductivityofCu-3Ti-1NialloyislessthanthatofCu-3Ti-3NiandCu-3Ti-5Nial
3、loys.Afteroveragingtreatment,boththehardnessandelectricalconductivityofCu-3Ti-5Nialloydecreasesharply.(7)CryogenictreatmentpromotesthegrainrefinementofCu-3Ti-xNi(x=1,3,5)alloys,andprecipitationoftinyparticlesphase,andmorecompleteprecipitationofNi3Tiphase.Inadditio
4、n,theintertwiningofdislocationspresentsaroundtheNi3TiprecipitatedphaseandthedislocationlinestransformintodislocationloopintheCumatrix.(8)CryogenictreatmentcanincreasethehardnessofCu-3Ti-xNi(x=1,3,5)alloys,buthasamlostnoeffectontheelectricalconductivity.Intherangeo
5、fexperiments,theoptimumcryogenictreatmentprocessforCu-3Ti-xNi(x=1,3,5)alloysisimmersedatliquidnitrogenfor15h,thehardnessnumberofCu-3Ti-xNi(x=1,3,5)alloysare228HV,200HVand217HV,respectively.Comparedwiththatbeforethecryogenictreatment,thehardnessnumberCu-3Ti-xNi(x=1
6、,3,5)alloysaftercryogenictreatmentisincreasedby11.2%,9.3%and16.0%respectively.Keywords:Cu-Ti-Nialloy;agingtreatment;cryogenictreatment;microstructure;hardness;electricalconductivityTheresearchwassupportedtheNationalNaturalScienceFoundationofChina(No.51274163),theR
7、esearchProgramofShaanxiProvincialKeyLaboratory(13JS076),thePivotInnovationTeamofShaanxiElectricMaterialsandInfiltrationTechnique(2012KCT-25)andShaanxiProvincialProjectofSpecialFoundationofKeyDisciplines.Ⅳ万方数据目录目录1绪论.................................................
8、..........................................................................................11.1研究背景及意义...................................................
