简介:Ionbeamenhanceddeposition(IBED)wasemployedtoincreasethefrettingfatigueresistanceofTi6AI4V.CrNandTiNhardcoatingswereappliedonthebasematerialandshotpeeningwascombinedwiththehardcoatingstostudytheduplexeffectonfrettingfatigueresistance,TheIBEDcoatingsexhibitedagoodbondingstrength.Theydidnotspalloffevenaftershotpeening.However,anoptimumcompositionofCrNshowedbetterfrettingfatigueresistancethanthatofTiNwiththesameprocessingparameters.
简介:纵的张力的性质原文如此有不同纤维体积部分的f/Ti-6Al-4Vcomposites被蒙特卡罗2-D模仿有限元素模型。纤维力量的随机的分发被二参数的Weibull功能表示。同时,接触元素和出生死亡元素被用来在debonding和纤维破裂以后描述界面的滑动过程(或矩阵裂开)分别地,它被子程序认识到在ANSYS-APDL(ANSYS参量的设计语言)应允了。试验性的结果证明收益应力和最终的张力的强度原文如此有增加的f/Ti-6Al-4Vcomposites增加纤维体积部分,当他们的相应紧张只是时相反。另外,几乎,一样的失败模式被获得在原文如此有各种各样的纤维体积部分的f/Ti-6Al-4Vcomposites什么时候界面砍力量被修理。最后,张力的力量由有限元素预言了分析与由全球分享负担的模型,预言了那相比本地人分享负担的模型和混合物的常规统治,因此画结论那个本地分享负担的模型为最终的张力的力量的预言是很完美的。
简介:血浆合金Zr和血浆nitriding的一个双处理被用来改进Ti-6Al-4V的tribological性质。Zr-N的微观结构合成(alloyed)层在Ti-6Al-4V和它的坚硬上形成了,磨擦并且穿性质被使用OM,SEM,GDOES,版本,microhardness测试者以及ball-on-disk摩擦计调查。微结构分析的结果证明alloyed层紧缩、一致并且主要由ZrN,听0.3和AlN组成。很微小的粘合剂和细微氧化穿的A是主要为修改Ti-6Al-4V穿机制。tribological性质在双处理以后显著地被改进。防摩的好联合并且穿抵抗因为修改Ti-6Al-4V主要被归因于在表面上形成并且提高了传播Zr层支持的金属氮化物的更高的表面坚硬。
简介:这个工作的目的是用电气化学的技术,光显微镜学,扫描电子显微镜学(SEM),和精力与氟化物离子在酸的人工的口水为牙齿的应用学习Ti-6Al-4V合金的降级行为散的spectrometry(版本)。试验性的结果证明那个氟化物离子在Ti-6Al-4V合金的降级上有重要影响,并且有氟化物离子(大约0.1wt%)的明显的批评集中。与增加氟化物离子集中,腐蚀潜力(E合金的corr)移动了向否定并且同时,合金的阻抗减少了到严重pitting腐蚀的从最小的腐蚀的显著转变在跟随TiO2的溶解的合金表面上被观察被动电影,导致合金的腐蚀抵抗的减少。TiO2的电气化学的溶解被动电影包含了氟化物原子的亲核的攻击到TiO2的钛原子。另外,在酸的口水的Ca2+和Na+可以包含表面反应并且使反应更复杂。
简介:AdditivelymanufacturedTi-6Al-4Vlatticestructureshavefoundimportantnicheapplications.However,theyoftenshowinsufficientcompressiveductilityorinsufficientstructuralintegrity.Inthisstudy,abatchof45octahedralTi-6Al-4Vlatticestructureswasmanufacturedinthreedifferentstrutdiameters(0.5,1.0,1.5mm)byselectiveelectronbeammelting(SEBM).Theinfluenceofpost-SEBMannealingonthecompressivedeformationcharacteristicsofthelatticestructurewasinvestigated.Theas-builtTi-6AI-4Vlatticesfragmentedwhenthecompressivestrainreached13%-23%dependingonstrutdiameter.Annealingat950℃(Ptransustemperature:995℃)onlyslightlyimprovedthecompressiveductilityofthelatticestructures.However,annealingat1050℃(p-annealing)fundamentallychangedthecompressivedeformationmodeofthelatticestructures.Theresultantcompressivestress-straincurvewasfeaturedbyalongsmoothplateauandnofactureoccurredevenaftersignificantdensificationofthelatticestructurehadtakenplace(>50%ofcompressivestrain).
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简介:Anovel,Ti-6A1-4V(Ti64)/Hydroxyapatite(HAat5%byweightconcentration)metal/ceramiccompositehasbeenfabricatedusingelectronbeampowderbedfusion(EPBF)additivemanufacturing(AM):specifically,thecommercialelectronbeammelting(EBMR)process.InadditiontosolidTi64andTi64/5%HAsamples,fourdifferentunitcell(model)open-cellularmeshstructuresfortheTi64/5%HAcompositewerefabricatedhavingdensitiesrangingfrom0.68to1.12g/cm^3,andcorrespondingYoung'smodulirangingfrom2.9to8.0GPa,andcompressivestrengthsrangingfrom-3to11MPa.ThesolidTi64/5%HAcompositeexhibitedanoptimaltensilestrengthof123MPa,andelongationof5.5%incontrasttoamaximumcompressivestrengthof875MPa.Boththesolidcompositeandmeshsamplesdeformedprimarilybybrittledeformation,withthemeshsamplesexhibitingerratic,brittlecrushing.Solid,EPBF-fabricatedTi64sampleshadaVickersmicroindentationhardnessof4.1GPawhiletheTi64/5%HAsolidcompositeexhibitedaVickersmicroindentationhardnessof6.8GPa.ThelowestdensityTi64/5%HAcompositemeshstrutsectionshadaVickersmicroindentationhardnessof7.1GPa.Opticalmetallography(OM)andseanningelectronmicroscopy(SEM)analysisshowedtheHAdispersoidstobehighlysegregatedalongdomainorgrainboundaries,buthomogeneouslydistributedalongalpha(hcp)plateletboundarieswithinthesedomainsintheTi64matrixforboththesolidandmeshcomposites.Thealphaplateletwidthvariedfrom-5μmintheEPBF-fabricatedTi64to-1.1μmfortheTi64/5%HAmeshstrut.TheprecursorHApowderdiameteraveraged5μm,incontrasttothedispersedHAparticlediametersintheTi64/5%HAcompositewhichaveraged0.5μm.ThisworkhighlightstheuseofEPBFAMasanovelprocessforfabricationofatruecompositestructure,consistingofaTi64matrixandinterspersedandexposedHAdomains,whichtotheauthorsknowledgehasnotbeenreportedbefore.Theresultsalsoillustratetheprospectsnotonlyforfabrica
简介:Three-dimensional-printed(3D-P)titaniumimplantsdisplaymanyadvantages,suchasdesignflexibility,higherefficiency,thecapabilitytoeasilyconstructcomplexorcustomizedstructures,etc.,andisbelievedtopotentiallyreplacetraditionalimplants.However,thebiologicalperformanceofthe3D-Ptitaniumsurfacehasnotbeeninvestigatedsystematically.Herein,weanalyzedthesurfacecharacteristicsof3D-PTi6AI4Vimplantsandevaluatedthebiologicalresponsesofbonemarrowderivedmesenchymalstromalcells(BMSCs)tothe3D-Psurfaceinvitro.Moreover,afterimplantationintotheratfemoralcondylefor3and6weeks,theosseointegrationperformaneewasevaluated.Theresultsshowedthe3D-PTi6Al4Vimplantpresenteddistinctfluctuantmacroscaleroughsurfaceandrelativelybetterhydrophilicitywhichenhancedtheadhesion,proliferation,osteogenicdifferentiationandangiogeneticfactorexpressionofBMSCs.Moreover,theinvivoosseointegrationperformancewasalsobetterthanthatofthecontrolgroupattheearlystage.Thepresentstudysuggestedthe3D-Ptitaniumalloyisapromisingcandidatetobeusedasimplantmaterial.
简介:来临三维(3-D)打印了技术在设定的多孔的钛(Ti)的制造提供大可能性植入。然而,打印Ti的bioinert性质提出一个突出的问题。混合微弧的氧化并且热水(MAO-HT)多孔的金属上的处理能生产multi-scaled层次矫形植入,为3-D的表面修正的出现大潜力打印了植入。在这研究,有毛孔的圆柱的多孔的Ti6Al4V(Ti64)脚手架640缩放吗??
简介:微单VⅠ是面向年轻人的一款极致完美、智能操控、张扬个性、便于存放的绿色交通工具,希望能解决城市年轻人出行的痛点,在城市里年轻人希望拥有一款轻便方便折叠又不占空间的代步工具。更加符合人体工程学的车架角度设计,专为长时间骑行而改进的舒适转把,更加符合电动车刹车力矩的刹把,简单快捷的折叠结构,高度整合的电池托架结构,以及为夜间安全出行缜密设计的灯光系统,