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Microstructural Evolution of Infrared Brazed cp-ti Using ti-Cu-Ni Brazes

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Journal of Materials Science & Technology 2011年第2期27卷 131-138页

作者： C.T.Chang T.Y.Yeh R.K.Shiue C.S.Chang Department of Mechanical Engineering National Hualien Industrial Vocational Senior High SchoolHualien 970TaiwanChina Department of Materials Science and Engineering National Taiwan UniversityTaipei 106TaiwanChina Engineered Materials Solutions 39 Perry AvenueMS 4-1AttleboroMA 02703-2410USA

Microstructural evolution of infrared vacuum brazed cp-ti using two ti-based braze alloys,ti-15Cu-15Ni and ti-15Cu-25Ni,has been *** infrared brazed joint consisted of eutectic ti 2 Cu/ti 2 Ni intermetallic compounds and ti-rich *** eutectic ti 2 Cu/ti 2 Ni intermetallic compounds disappeared from the joint after being annealed at 900 C for 1 *** contrast,the depletion rate of both Cu and Ni from the braze alloy into cp-ti substrate at 750 C annealing was greatly decreased as compared with that annealed at 900 *** ti 2 Cu/ti 2 Ni phases were observed even if the specimen was annealed at 750 C for 15 *** the Ni content of the ti-15Cu-25Ni braze alloy is much higher than that of the ti-15Cu-15Ni alloy,the amount of eutectic ti 2 Cu/ti 2 Ni phases in ti-15Cu-25Ni brazed joint is more than that in ti-15Ci-15Ni brazed ***,similar microstructural evolution can be obtained from the infrared brazed joint annealed at various temperatures and/or time for both filler metals.

关键词： Infrared Brazing cp-ti ti-Cu-Ni fillers Microstructure

Design and performance evaluation of additively manufactured composite lattice structures of commercially pure ti(cp-ti)

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Bioactive Materials 2021年第5期6卷 1215-1222页

作者： Wei Xu Aihua Yu Xin Lu Maryam Tamaddon Mengdi Wang Jiazhen Zhang Jianliang Zhang Xuanhui Qu Chaozong Liu Bo Su Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyState Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing100083China Institute of Orthopaedic&Musculoskeletal Science University College LondonRoyal National Orthopaedic HospitalStanmore HA74LPUK Bristol Dental School University of BristolBristol BS12LYUK School of Physiology Pharmacology and NeuroscienceUniversity of BristolBristolBS81TDUK School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China

ti alloys with lattice structures are garnering more and more attention in the field of bone repair or regeneration due to their superior structural,mechanical,and biological *** this study,six types of composite lattice structures with different strut radius that consist of simple cubic(structure A),body-centered cubic(structure B),and edge-centered cubic(structure C)unit cells are *** designed structures are firstly simulated and analysed by the finite element(FE)*** pure ti(cp-ti)lattice structures with optimized unit cells and strut radius are then fabricated by selective laser melting(SLM),and the dimensions,microtopography,and mechanical properties are *** results show that among the six types of composite lattice structures,combined BA,CA,and CB structures exhibit smaller maximum von-Mises stress,indicating that these structures have higher *** on the fitting curves of stress/specific surface area versus strut radius,the optimized strut radius of BA,CA,and CB structures is 0.28,0.23,and 0.30 mm *** corresponding compressive yield strength and compressive modulus are 42.28,30.11,and 176.96 MPa,and 4.13,2.16,and 7.84 GPa,*** cp-ti with CB unit structure presents a similar strength and compressive modulus to the cortical bone,which makes it a potential candidate for subchondral bone restorations.

关键词： Composite lattice structure Finite element modelling Selective laser melting(SLM) cp-ti

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cp-ti高温流变软化行为及机理研究

CP-Ti高温流变软化行为及机理研究

作者：马建宇燕山大学

学位级别：硕士

cp-ti凭借优异耐腐蚀性以及良好的生物相容性等优点,在航空航天、化学工业、船舶以及医学等领域所使用比例越来越大。由于大部分cp-ti零部件需经热加工的方式来生产,因此研究cp-ti热变形行为及动态组织演变就显得及其重要。本文研究了cp... 详细信息

cp-ti凭借优异耐腐蚀性以及良好的生物相容性等优点,在航空航天、化学工业、船舶以及医学等领域所使用比例越来越大。由于大部分cp-ti零部件需经热加工的方式来生产,因此研究cp-ti热变形行为及动态组织演变就显得及其重要。本文研究了cp-ti高温变形中发生的特殊软化行为以及动态组织演变规律,并探讨其产生机理及影响因素。研究表明:cp-ti高温流变软化行为是由动态回复、动态再结晶和动态相变共同引起的。其中动态相变的产生与位错活动密切相关,具体表现为:位错在晶界产生并且由晶界处向α相晶粒内部扩展,位错扫过的部分形成高温β相,并将α相晶粒切割成α+β板条组织;α相晶界处聚集的大量位错使晶界处发生α→β动态相变,随着变形量的增大,动态相变区域向晶粒内部扩展,最终整个α相晶粒变成β相晶粒;热变形时位错在α相内部产生,并使部分α相变成β相。cp-ti在较高应变速率下热变形时,动态相变的发生先于动态再结晶;在较低应变速率进行变形时,动态相变和动态再结晶几乎同时发生。初始晶体学取向对动态相变行为有显著的影响。有预变形试样中因动态相变导致的板条组织比没有施加预变形的试样明显增多,并且流变曲线的峰值应力也降低了。这说明预变形调整了cp-ti中初始α相的取向,该取向更有利于α相发生动态相变。进一步研究发现,cp-ti中的初始α相主要为T织构的取向,而施加预变形后cp-ti中的α相主要为R织构的取向。同时通过施密特因子分析证实,R织构的取向比T织构的取向更有利于动态相变的发生,热变形开始后位错更容易在棱锥面上滑移导致动态相变的发生。

关键词： cp-ti 热变形组织演变织构取向动态相变动态再结晶

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cp-ti激光焊接接头组织与性能研究

电焊机 2018年第12期48卷 13-16页

作者：黄忠宝王鹏飞尚立宝陈永亮刘登邦上海板换机械设备有限公司上海201508 江西应用科技学院江西南昌330004

采用光学显微镜等观察和测试cp-ti激光焊接头组织和硬度,对比接头在酸性、中性和碱性环境中的耐腐蚀性能。结果表明:接头各区域组织均为α相,其中焊缝中的α晶呈针状、锯齿状和板条状3种形貌,在热影响区则为锯齿状。硬度测试表明,焊缝... 详细信息

采用光学显微镜等观察和测试cp-ti激光焊接头组织和硬度,对比接头在酸性、中性和碱性环境中的耐腐蚀性能。结果表明:接头各区域组织均为α相,其中焊缝中的α晶呈针状、锯齿状和板条状3种形貌,在热影响区则为锯齿状。硬度测试表明,焊缝为接头硬度值最高区域,显微硬度达到210 HV,热影响区次之,约为165 HV。接头在酸性环境中的耐蚀性最差,表现为其电流密度、腐蚀速率均高于碱性和中性环境中的。

关键词： cp-ti 晶粒显微硬度电流密度耐蚀性

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cp-ti棒材加热拉压不对称变形研究

内燃机与配件 2019年第9期 104-105页

作者：张晓丽严思梁安徽建筑大学城市建设学院合肥230000 合肥工业大学合肥230000

近年来,随着国民经济的发展和国防工业建设的突飞猛进,高性能、轻量化高端精密构件的技术性需求日益增加。cp-ti是一种新型结构材料,具有密度小、比强度高、抗蚀抗疲劳等优异的综合性能,能够满足新型飞机研制对机身减重、提高飞行机动... 详细信息

近年来,随着国民经济的发展和国防工业建设的突飞猛进,高性能、轻量化高端精密构件的技术性需求日益增加。cp-ti是一种新型结构材料,具有密度小、比强度高、抗蚀抗疲劳等优异的综合性能,能够满足新型飞机研制对机身减重、提高飞行机动性等方面的需求,在航空、航天、汽车、造船等行业获得日益广泛的应用,其中钛产量中约70%用于航空宇航工业。然而cp-ti在室温下塑性变形过程中存在变形抗力大、延伸率很低、材料流动性差以及成形质量差等问题,如何提高cp-ti的塑性成形能力成为其塑性变形过程研究中亟待解决的问题。本文选取cp-ti棒材,通过对棒材试样进行不同温度、速率的单向拉压试验,获得其真应力-真应变曲线,并分析其在拉压加载下的硬化关系。

关键词： cp-ti 塑形变形加工硬化

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体外浸泡纯钛的表面腐蚀和ECAP的影响

稀有金属材料与工程 2015年第1期44卷 204-208页

作者：周清程刚良徐军南京航空航天大学江苏南京210016

采用在Ringer模拟体液静态体外浸泡的方法,研究工业纯钛试片经过一定时间的浸泡后的失重和表面形貌的变化。采用等通道径角挤压(ECAP)方法处理工业纯钛并与粗晶纯钛进行对比,对ECAP处理的TA9和粗晶TA9也做了对比。结果表明:纯钛在400℃E... 详细信息

采用在Ringer模拟体液静态体外浸泡的方法,研究工业纯钛试片经过一定时间的浸泡后的失重和表面形貌的变化。采用等通道径角挤压(ECAP)方法处理工业纯钛并与粗晶纯钛进行对比,对ECAP处理的TA9和粗晶TA9也做了对比。结果表明:纯钛在400℃ECAP处理后的微观组织形成具有明显方向性的板条状组织,ECAP纯钛表面沉积的Na Cl晶体数量大于粗晶ti,TA9也表现出相似结果。纯钛的腐蚀机制是一种受到电偶腐蚀控制的均匀腐蚀,细晶组织导致电偶的数量增加。

关键词：生物医用材料表面电化学势 cp-ti ECAP

Electrochemical behaviour of ti alloys containing Mo and Ta as β-stabilizer elements for dental application

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Transactions of Nonferrous Metals Society of China 2013年第12期23卷 3829-3836页

作者： Daniel MARECI Romeu CHELARIU Georgiana BOLAT Adrian CAILEAN Viorel GRANCEA Daniel SUtiMAN Faculty of Chemical Engineering and Environmental Protection "Gheorghe Asachi" Technical University of Iasi Faculty of Materials Science and Engineering "Gheorghe Asachi" Technical University of Iasi

Corrosion behaviour of the studied ti12Mo and ti60Ta alloys with the same Mo equivalent values （12%, mass fraction） together with the currently used metallic biomaterials cp-ti were investigated for dental applications. The electrochemical properties of the samples were examined using electrochemical techniques： such as open-circuit potential, potentiodynamic polarization curves and electrochemical impedance spectroscopy （EIS）, in two electrochemical media of artificial saliva and fluoridated artificial saliva （0.1%fluoride ions, F-） at 37 °C. Fluoride is commonly included in toothpastes, odontological gels and dental rinses to prevent dental caries and relieve dental sensitivity. The passive behaviour for all the titanium samples is observed for both solutions. The ti60Ta alloy appears to possess superior corrosion resistance than the ti12Mo and cp-ti in both electrochemical media.

关键词： ti12Mo ti60Ta cp-ti open-circuit potential potentiodynamic polarization electrochemical impedance spectroscopy

Influence of different rolling routes on mechanical anisotropy and formability of commercially pure titanium sheet

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Transactions of Nonferrous Metals Society of China 2017年第6期27卷 1306-1312页

作者： Ding-kai LIU Guang-sheng HUANG Gui-lin GONG Guan-gang WANG Fu-sheng PAN State Key Laboratory of Mechanical Transmission College of Materials Science and EngineeringChongqing University Chongqing 400044 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400044 China Chongqing Research Center for Advanced Materials Chongqing Academy of Science & Technology Chongqing 401123 China

Influence of three different rolling routes on mechanical anisotropy and formability of commercially pure titanium sheetwas *** A and Route B are unidirectional rolling(UR)where the rolling direction is along initial rolling direction(RD)and transverse direction(TD),*** C is cross rolling(CR)where the rolling direction is changed by90°aftereach rolling *** microstructure and texture,tensile mechanical properties including strength and elongation,and also theanisotropy of the UR and CR sheets were investigated at room *** XRD results indicate that the texture intensity ofrolled samples gradually weakens from Route A to Route *** with Route A and Route B rolled samples,the Route C rolledsamples show a smaller planar *** deep drawing tests reveal that cross rolling can avoid the occurrence of *** tests indicate that rolling routes have an effect on stretch formability of pure titanium sheet.

关键词： cp-ti cross rolling anisotropy texture deep drawing

Effect of surface nanocrystallization and PPEC time on complex nanocrystalline hard layer fabricated by plasma electrolysis

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Transactions of Nonferrous Metals Society of China 2010年第3期20卷 425-431页

作者： M.ALIOFKHAZRAEI SH.AHANGAR ANI A.SABOUR ROUHAGHDAM Department of Materials Engineering Faculty of EngineeringTarbiat Modares University Department of Advanced Materials and Renewable Energies Iranian Research Organization for Science and Technology(IROST)

Size distribution of nano-carbides produced by duplex treatments of surface nanocrystallization(by surface severe plastic deformation) and plasma electrolytic carburizing on cp-ti was *** and kurtosis of Gussian shape distribution curves were studied and the effect of time was *** usage of longer time is more suitable for achieving less size of complex *** roughness of treated samples was *** is observed that there is an optimum level for time on surface roughness increasing(difference between two measured data).

关键词： surface nanocrystallization hard layer roughness cp-ti