高速弹丸冲击诱发tc4钛合金中绝热剪切带的微观结构

《高速弹丸冲击诱发tc4钛合金中绝热剪切带的微观结构》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、江苏大学硕士学位论文AbstractThisp叩eristosnldythetit趾iuma110y(TC4)platesimpactedbyprojectileatah噜hspeed，andthentheo唱舭izatiom盯01lndthecraterw邪characterizedbymetauo伊叩hicmicroscope．Tbmeasure舳dcoI玎putetheo唱卸【jZationofthetargetplateafrectedbytheimpactindifrerentthickness，wehaVeobseⅣedthatmanydefectsandthesecondp

2、h鹪eswithintheshearbandintheplatesbyusingscanningelectI伽IIlicroscopeandthenstlldythejreVohtionmles．TheeVolutionandcharacteristicsofthe砬emalⅡ1icrost咖eintheshearbandweree印loredby廿ansmissionInicroscope(TEM)，柚dthereasonSofthearnorphousw豁alsodiscussed．Theexperimentsshowedthephenomenonofmelting蠡stse仕ing

3、andcoarse鲥nsbelowthecmter印pears．Thedefor嫩tionbandandadiabaticshearbandfomlad啪llndtllecrater．Theadiaba：ticshearbandhasthech锄ct嘶sticsofperiodic．Th盯eisaself’o玛锄liz啦behaViorofshearband，methodtopredictthebehaVior：Momentumdifmsioncandescribethehterstageofshearlocalization，andpertllrt斌ion卸alysiscaneXpla

4、intheinitial铲o、Ⅳthoftheshearbandofearlystage．Thewidthoftheshearbandi11creasewiththeshearstrain．Thecrackandnlicroporousappearedinthcshearbandafbcrcharacterizedbyscanningelec仃伽IIlicroscopy(SEM)．Shearlocalizationgen盯allyoccurredbeforethedamage，蛆dthesedefectsstilldeVelopedandinteractedintheprocessofs

5、hear10calization．Thesecondph嬲eintheshe盯b觚dappearedt0ag铲egate．Accordingtotherelationshipbe柳eenthe伊孤mlarityandspacing，wecanin】ferthatthe孕anularitytendedtoincre嬲eintheshearb柚d．weusedTEMto锄lysistheInicro咖ctllreofASBs．111eresultsdisplayedt】1erew鹊ammidgelineexitedintheASBs，whichshowedthttheAsBsistheteX

6、tureinducedbystressin如rther．Frommeouteredget0theinsideofshearband，equiaxialgrains粤讪a11ystretchandbmken，evenreachestomnoscale．BecallsethenumberofprecipitatesinTC4aⅡoyare危w，sothegrainb(mn(La巧orphaseint柏ceiseasytobecomeaobstacleofpilillgupofdislocations．Accord崦tothisresun，wethinkthepphaseinmeareaof伐

7、grainbolmdariesofTC4alloyshouldberelativelyeasytobecomeaobstacleofpilingupofdislocations，andcausingthes仃essconcen仃a：tjontoreachthecmicalValueof内m吨AsBs．¨I高速弹丸冲击诱发TC4钛合金中绝热剪切带的微观结构Thedislocation玳；t、Ⅳorkfo瑚edinthepphaseaf