近β钛合金TLM的应力应变行为、腐蚀性能及管材制备工艺研究

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1、国内图书分类号：TGl46Y831119lI学校代号：10699研究生学号：01604G072⑩面喜l；暮虫李硕士i，学位论文近B钛合金TLM的应力应变行为、腐蚀性能及管材制备工艺研究硕士研究生：导师：申谓掣堆嘬别：学科、专业：所在单位：答辩日期：授予学位单位：罗丽娟周廉院士于振涛副教授工程硕士材料加工工程材料科学与工程学院2005年7月5日西北工业大学塑!!三些垒兰三兰竺：!兰堡篁兰AbstractPcrcutaneousTranslumina]CoronaryAngioplasty(PTCA)withs

2、tentimplantingistheeffectivemeasuretocurevasculardisease．ButRestenosisafterthetherapyisthemainprobleminclinicapplication．Possiblemechanismofrestenosisconsidered，improvingmechanicalcompatibilityandtissuecompatibilityofstentmaterialsisnecessary．Developingnew

3、materialwithnontoxicelementsandbettermechanicalproperlyisimportanttOimprovemechanicalcompatibility．Anewnearbetatitanium(TLM)developedbyNorthwestInstituteforNonferrousMetalResearchforbiomedicalapplicationhasbeenstudiedinthispaper．Asoneoftheaspectofbiofuncti

4、on，Super-elasticitywasstudiedbyitsstress-strainbehavioratroomtemperature．CorrosivebehaviorofthealloyinRinger’SsolutionwasinvestigatedcomparedwithTiNiand316Lstainlesssteelbyelectrochemicalexperimenttoestimateitsbiocompatibility．Coldrollingtechnicwasadoptedt

5、oprocessthetubeofTLMalloy．Therollingparameterandannealingtreatmentduringcoldrollingwereinvestigated．Themainresultswassummarizedasfollows：Super—elasticitywasfoundduringloading／unloadingtensilecurveswhichwascausedbydeformationinducedmartensite．Theelasticreco

6、veredstrainwasbeyondinelasticrecoveredstrain．Recoveredstraindecreasedintheorderofhotrolling，solutionandaging，solutionandaircool，solutionandwaterquenchsamples．Inthisexperimentbestsuper·elasticitywasgainedinhotrollingsamplesbecauseofthematrixstrengthenedbydi

7、slocations．Themechanismofsuper-elasticityincludesstraininducedmartensite，preferredorientationofmartensiteandtwinningetc．ThecorrosionbehaviorofTLMinRinger’SsolutionWItSinvestigatedbycomparingwithTiNiand316Lstainlesssteel．Anodepolarizationcurvesshowedthatpas

8、sivationpropertiesdescendediutheorderofTLM，TiNiand316L摘要stainlesssteel．Accordingtothestabilityofpassivationfilm．TI，Mexhibitedbestcorrosionresistance．ThecompoundoxidesofTI．MpassivationfilmwithpHⅢ<7hadgoodresis