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1、纳米材料论文（nanomaterials）Theprogressandproblemsofthepreparationofblocknanomaterialswerereviewed.Thispaperpresentsthepreparationtechnologyofthetwokindsofpotentialblockmetalnanocrystalswiththedirectcrystallizationmethodofultra-shorttimepulsecurrentandthedirectcrystallization
2、ofdeepcolddirectcrystallization,andthefutureprospectsoftheresearchanddevelopmentareprospected.KeywordsnanocrystallineblockmaterialpreparationofamorphouscrystallizationmechanicalalloyingDEVELOPMENTOFBULKMETALNANOMETERMATERIALSPREPARATIONTECHNOLOGIESANDTHEIRESTIMATEABSTR
3、ACTOnthebasisofthesummarizationofbulkmetalnanocrystallinematerialspreparationmethods,twopotentialtechnologies:supershortfalsecurrentdirectcrystallizationmethodandhighundercoolingdirectcrystallizationmethodareprograms.Intheend,thedevelopmentandapplicationprospectsofvari
4、ousmethodsarealsoestimated.KEYWORDSbulknanometermaterial,thepreparationofmaterials,thecrystallizationofamorphousalloys,mechanicalalloying,highundercoolingCorrespondent:ZhangZhenzhongNorthwesternPolytechnicalUniversity,StatekeyLaborotryofSolidificationProcessingXi'an710
5、072Sincetheearly80sscientistsinGermanyH.V.Gleitersuccessfullyusinginertgascondensationinsitupressureafterlegalsystemofpuresubstanceblocknanomaterials[1],theresearchandpreparationtechnologyofnanomaterialsinrecentyearscausedwidespreadaroundtheworld.Becauseofnanomaterials
6、withuniquenanograinsizeandcharacteristicsofhighconcentrationofgrainboundaryandtheresultingsmallsizequantumeffectandboundaryeffect,makeitshowaserieswithordinarypolycrystalandamorphoussolidshavetheessentialdifferencebetweenmechanicalandmagneticproperties,suchassound,ligh
7、t,electricity,[2],forthepreparationofnanometermaterials,structure,propertiesandapplicationresearchisbecomingahotspotofmaterialscienceresearchinthe90s.Tomakethiskindofnewmaterialsforboththeoreticalresearch,andcanbeusedinpracticetobroadenitsscope,explorethethree-dimensio
8、nallargesizehighqualitynanocrystallinesamplepreparationtechnologyhasbecomeoneofthekeystonanomaterials.Inthispaper,adv
