β相穩(wěn)定化元素對ti25.0nb1.5o(at.)合金阻尼特性的影響研究

1、天津大學(xué)碩士學(xué)位論文β相穩(wěn)定化元素對Ti25.0Nb1.5O(at.%)合金阻尼特性的影響研究姓名：王志威申請學(xué)位級別：碩士專業(yè)：材料學(xué)指導(dǎo)教師：余黎明201112ABSTRACTSnoektypehighdampingalloyisthehighdampingalloybasedonSnoekrelaxationeffectcausedbypointdefect’Stransitionprocess，morespecificallya

2、pplicationofstressleadstoaredistributionoftheinterstitialatomdissolvedintheoctagonalintersticesinthebcchostlattice，atthesametime，thevibrationalenergywouldbedissipated13TialloyhasthemostapplicationprospectsofSnoektypedamp

3、ingalloysStablepphasestructure(bcc)isthemostimportantpreconditionforobtainingastableSnoekrelaxationeffectTheeffectofeutectictype(Mo，z0andeutectoidtype(Fe，c0pphasestabilizerelementonthepphasestabilization，dampingproperty，

4、dynamicalmechanicalpropertyandthermodynamicparameterofSnoekrelaxationoftheTiNb—OalloywerestudiedinthepaperMoegandBo／Mdaretheimportantstandardsforestimatingthestabilizationofthe13phaseinthedesignprocessofanewSnoektypehigh

5、dampingalloysThecalculatedresultsshowthatMoandFearethegoodelementsforpphasestabilizerButMocontentshouldbecontrolledbetween2Oat％and65at％，andFecontentbecontrolledinlessthan30at％Q～oftheTi250Nb150(at％)alloyisaboutO03，whenpph

6、asestabilizerelementsareaddedtothealloy，althoughthepeaktemperatureincreasesandthetemperaturerangebroadens，butthedampingvaluedecreaseThisphenomenonhasaconcernincategoryandcontentofthestabilizerelementseutectoidtypeelement

7、moreeasilyresultthesharpdecreaseinQ—thantheeutectictype，whentheeutectic鑼peelementisnottoomuchthealloycanhasagoodperformanceActivationenergyisonethermodynamiccharacteristicparameterreflectingtheSnoekpeak，pphasestabilizere

8、lementscanenhancetheactivationenergyobviouslyButwhentheactivationenergysharplyincreasetoahighlevel，thedampingpropertymaybedecreasesharply，iftheincreaseofactivationenergycausedbydecreaseinthelatticeconstantisSOhighthatthe