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1、AStudyofDampingCapacityinMagnesiumAlIoys*ByKoichiSugimoto**,KazunoriNiiya***,TairaOkamoto**,andKatsuhikoKishitake****Theeffectsofadditionsofnickeltomagnesiumoverthecompositionrangefrom0to40.41%andofcopper,aluminium,andtintomagnesiumby15.10%,18.40%,and21.40%,respec
2、tively,ontheinternalfrictionandYoung'smodulushavebeeninvestigatedbyuseoftheflexuralvibrationmethodatroomtemperature.ItwasgenerallyfoundthattheMg-Mg2Nihypo-eutecticalloysampleshadthewell-definedamplitude-dependenceofinternalfrictionwhichresultedinaveryhighdamp•ingc
3、apacityathigherstresslevels.Thedampingcapacityoftheeutecticandhyper-eutecticsamplesoftheMg-Mg2Nialloyandalsoofthehypo-eutecticsamplesoftheMg-Mg2Cu,Mg-Mg17AI12,andMg-Mg2Snalloyswasnotsohighasthatofthehypo-eutecticsamplesoftheMg-Mg2Nialloy.Theeffectsofthesizeandshap
4、eofthemagnesiumphase,thesolubilityofthealloyingelementsinmagnesiumandthegrainsizeonthebehaviourofinternalfrictionandYoung'smoduluswereexam•inedanddiscussed.Theresultswereexplainedintermsofthevibratingstringmodelofthedisloca•tionsinmagnesiumwhichwerepinnedweaklybyi
5、mpurityatoms.ItisconcludedthattheverysmallsolubilityofnickelinmagnesiumandthedendriticorglobularshapeoftheprimarymagnesiumintheMg-Mg2Nihypo-eutecticsamplesareresponsibleforthemuchlowerbreakawaystressthanthatinotheralloysandpuremagnesiumsamples.(ReceivedOctober21,1
6、976)Ontheotherhand,itwasverysmallinpoly•I.Introductioncrystallinesampleswithcolumnargrainsorthe(OOOl)-texturealongthespecimenaxis.AllAccordingtothepreviousworkonthetheevidencehasledtotheconclusionthatinternalfrictionandYoung'smodulusinsingletheamplitude-dependenti
7、nternalfrictionandcrystalandpolycrystallinesamplesofpureYoung'smodulusarecausedbythemovementmagnesiumof99.95%purity,awell-definedofdislocations,whichareweaklypinnedbyamplitude-dependenceoftheinternalfrictionimpurityatomsonthebasalplane,andthatitandYoung'smoduluswa
8、sfoundtoexistinispossibleforhigh-dampingmagnesiumalloyssomespecialcases(l).Theamplitude-dependenttobenewlydevelopedonthebasisofsuchainternalfrictionwasv
