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1、NanoStructuredMaterials,Vol.12,pp.23-28,1999ElsevierScienceLtdPergamon01999ActaMetallurgicaInc.PrintedintheUSA.Alltightsreserved0965-9773/99&seefrontmatterPI1SO9659773(99)00059-SCONSOLIDATIONANDHIGHSTRAINRATEMECHANICALBEHAVIOROFNANOCRYSTALLINETANTALUMPOWDERSangH.Yoo,T.S.Sudarshan,KrupaSethuramMater
2、ialsModificationInc,2929-PlE&ridgeRd,Fairfax,VA,22031GhatuSubhashAssistantProfessor,MichiganTechnologicalUniversity,Houghton,MI,49931RJ.DowdingArmyResearchLaboratory,AMSRL-WM-MD,AberdeenProvingGround,MD,21005AbStrUCt--Highductilityandstrengthexhibitedinnanograinedmaterialscanpotentiallybeexploitedi
3、nexplosivelyformedpenetratorlinerapplications,BothcoarseandnanocrystallinetantalumpowderwereconsolidatedbyPlasmaPressureCompaction(P’C)tostudytheeflectofgrainsizeondynamiccompressionproperties.ThepowderswereconsolidatedrapidlywithIminuteofisothermalholdingtimetoretaininitialmicrostructure.ThePzCcon
4、solidatedspecimenswerecutbyelectricdischargemachining(EDM,polishedforSEMcharacterization,andtestedindynamiccompressionusingaKolskyapparatus.Thee#ectofgrainsizeonyieldstressandstrainwasinvestigatedatvariousstrainratesforacoarsegrainedandananograinedspecimen.Especially,thehighstrainrateresponseofnano
5、crystallinetantalumisdiscussedinthispaper.01999ActaMetallurgica~nc.INTRODUCTIONThehighdensityandductilityoftantalummakeitanattractivematerialforballisticapplicationssuchasexplosivelyformedpenetrators(EFPs).ThedynamicformabilityofanEFPdependsonthephysicalandmechanicalpropertiesofthematerial,especial
6、lytheinitialcrystallographictextureandtheevolveddeformationtexture.TofabricateatantalumEFPthatmeetsdynamicformabilityrequirements,processing-microstructure-propertyrelationshipsmustbeestablished.HighstrainratedeformationisthemostcriticalperformancefeatureforanEFP.Deformationstudiesatlowstrainratesh
7、aveindicatedthatductilebehaviorisobservedinpolycrystallinemetalswithfinegrainstructureincludingtantalum[l].Therefore,itisimportanttounderstandtheeffectofgrainsizerefinementontheflowandfailurebehaviorforpoly
