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1、Mat.Res.Bull.,Vol.27,pp.1407-1414,1992.PrintedintheUSA.0025-5408/92$5.00+.00Copyright(c)1992PergamonPressLtd.ANISOTROPYOFYOUNG'SMODULUSANDPOISSON'SRATIOINDIAMONDClaudeA.KleinRaytheonCompany,ResearchDivisionLexington,Massachusetts02173(ReceivedAugust31,1992;CommunicatedbyW.B.White)
2、ABSTRACTTheelasticmodulusEofdiamondisoftensetequalto1/s11--1050GPa,whichassumesthatitdoesnotvarymuchwithorientation,andmanyauthorsuse~---0.2asanappropriateaveragevalueofPoisson'sratio,whichisincorrect.Inthispaper,weshowthat,sincetheelasticconstantsofdiamondareknownwithgreataccurac
3、y,itisastraightforwardmattertoderiveexactnumbersforEand~thattakeintoconsiderationthestressdirection,theintrinsicanisotropy,aswellasthecrystallineconfiguration.FortexturedCVDdiamonddeposits,wefindthat,inafirstapproximation,theHershey-Kr6ner-Eshelbyaveragingprocedureyieldsacceptable
4、numbers,E--1143GPaand~--0.0691,whicharequitecompatiblewithavailableexperimentalevidence;thisconfirmsthathigh-qualitydepositshaveelasticconstantssimilartothoseofsingle-crystalnaturaldiamond.MATERIALSINDEX:diamondIntroductionThesuccessfulsynthesisofdiamondbymeansofchemicalvapordepos
5、ition{CVD)techniqueshasstimulatedenormousinterestinpotentialapplicationsofdiamondforavarietyofengineeringtasks.Manyoftheseapplicationsinvolveevaluatingthermallyormechanicallyinducedstresses,whichrequiresapropercharacterizationoftheelasticproperties,i.e.,Young'smodulusEandPoisson's
6、14071408C.A.KLEINVol.27,No.12ratiov.Inthisregard,itiscommonlyassumedthatthemodulusofdiamondcanbesetequalto1050GPasince"Edoesnotvarygreatlywithorientation"[1];furthermore,ithasbeenstated[1]andgenerallyacceptedthat"vvariesbetween0.1and0.29{V=0.2),"whichisincorrect.Infact,sincetheela
7、sticconstantsofdiamondareknownwithgreataccuracy{seeTable1),itisastraightforwardmattertodescribetheelasticbehavior,whichincludesassessingthedirectionalityofEandinsinglecrystalsaswellasobtainingtheelasticcoefficientsofCVDdepositsthatmayexhibitcrystallographictexture.Inthispaper,wewi
8、lladdressthisproblemandprovidenum
