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Interaction of {11■2} twin variants in hexagonal close-packed titanium

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Journal of Materials Science & Technology 2019年第4期35卷 660-666页

作者： Xiaocui Li Jingwei Li Bo Zhou Mingchao Yu Manling Sui Institute of Microstructure and Property of Advanced Materials Beijing University of Technology

As multiple{11■2}twin variants are often formed during deformation in hexagonal close-packed(hcp)titanium,the twin-twin interaction structure has a profound influence on mechanical *** this paper,the twin-twin interaction structures of the{11■2}contraction twin in cold-rolled commercial purity titanium were studied by using electron backscatter diffraction(EBSD)and transmission electron microscopy(TEM).Formation of the{11■2}twin variants was found to deviate the rank of Schmid factor,and the non-Schmid behavior was explained by the high-angle grain boundary nucleation *** the observed twin-twin pairs manifested a quilted-looking structure,which consists of the incoming twins being arrested by the obstacle ***,the quilted-looking{11■2}twin-twin boundary was revealed by TEM and high resolution TEM ***-twinning,lattice rotation and curved twin boundary were observed in the obstacle twin due to the twin-twin reaction with the impinging twin.A twin-twin interaction mechanism for the{11■2}twin variants was proposed in terms of the dislocation dissociation,which will enrich the understanding for the propagation of twins and twinning-induced hardening in hcp metals and alloys.

关键词： HCP titanium {11■2} twin-twin interaction EBSD analysis TEM observation

Uniaxial Strain-Induced Grain Boundary Migration in titanium

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Acta Metallurgica Sinica(English Letters) 2021年第12期34卷 1715-1720页

作者： Tao Sun Aidong Tu Hao Wang Shu-Jun Li Hui Peng Jian-Ping Li State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China National Key Laboratory of Shock Wave and Detonation Physics Institute of Fluid PhysicsMianyang 621900China

The mechanical response of a bi-crystal model with a 90°grain boundary under external compressive and tensile loading parallel to the boundary plane normal was investigated with molecular dynamics *** grain boundary was found to migrate along two opposite directions upon compressive and tensile straining,with the formation of inter-connected coherent twin boundary and basal/prismatic *** atomic details of such grain boundary migration were unraveled,which indicated the role of interface *** temperature effect was also discussed.

关键词： Grain boundary titanium Migration Dislocation Twinning

Polyetheretherketone and titanium surface treatments to modify roughness and wettability–Improvement of bioactivity and antibacterial properties

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Journal of Materials Science & Technology 2021年第36期95卷 213-224页

作者： Davide Porrelli Mario Mardirossian Nicola Crapisi Marco Urban Nicola Andrea Ulian Lorenzo Bevilacqua Gianluca Turco Michele Maglione Department of Medical Surgical and Health SciencesUniversity of TriestePiazza dell'Ospitale 134129TriesteItaly

Among the materials available for implant production,titanium is the most used while polyetheretherketone(PEEK)is emerging thanks to its stability and to the mechanical properties similar to the ones of the bone *** surface properties like roughness and wettability play a paramount role in cell adhesion,cell proliferation,osteointegration and implant ***,the bacterial adhesion to the biomaterial and the biofilm formation depend on surface smoothness and *** this work,two different treatments,sandblasting and air plasma,were used to increase respectively roughness and wettability of two materials:titanium and *** effects were analyzed with profilometry and contact angle *** biological properties of the material surfaces were also investigated in terms of cell adhesion and proliferation of NIH-3T3 cells,MG63 cells and human Dental Pulp Stem ***,the ability of Staphylococcus aureus to adhere and form a viable biofilm on the samples was *** biological properties of both treatments and both materials were compared with samples of Synthegra;titanium,which underwent laser ablation to obtain a porous micropatterning,characterized by a smooth surface to discourage bacterial *** cell types used were able to adhere and proliferate on samples of the tested *** adhesion was higher on sandblasted PEEK samples for both MG63 and NIH-3T3 cell lines,on the contrary,the highest proliferation rate was observed on sandblasted titanium and was only slightly dependent on wettability;h DPSCs were able to proliferate similarly on sandblasted samples of both tested *** highest osteoblast differentiation was observed on laser micropatterned titanium samples,but similar effects,even if limited,were also observed on both sandblasted materials and air plasma treated *** lowest bacterial adhesion and biofilm formation was observed on micropatterned titanium samples whereas,the

关键词： PEEK titanium Micropatterning Roughness Wettability Differentiation

Au@Ag@Pt core–shell nanorods regulating Ag release behavior endow titanium antibacterial activity and biocompatibility

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Rare Metals 2022年第2期41卷 630-638页

作者： Jia-Jun Qiu Ting-Ting Yang Yi-Fan Li Wen-Hao Qian Xuan-Yong Liu School of Chemistry and Materials Science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of Sciences School of Materials Science and Engineering Jiamusi University Smart Materials and Surfaces Laboratory Faculty of Engineering and EnvironmentNorthumbria University Shanghai Xuhui District Dental Center

Although titanium and its alloys are extensively used in orthopedics and dentistry fields,implant failures still happen because of implant-associated ***,Au@Ag@Pt core–shell nanorods with noble metal combination were fabricated and assembled on medical titanium surface and the antibacterial activity and biocompatibility were *** results showed that antibacterial rates of Ti–Au@Ag@Pt against *** and *** were 89.7%and 92.7%,***,Ti–Au@Ag@Pt showed no obvious cell toxicity with MC3 T3-E1 cells grew well on the sample *** was discovered that the Pt shell layer on Ti–Au@Ag@Pt slowed down the Ag ion release rate which endowed medical titanium surface with both antibacterial activity and good biocompatibility.

关键词： titanium Silver Nanorod Antibacterial Biocompatibility

Gelcasting of titanium hydride to fabricate low-cost titanium

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Rare Metals 2015年第5期34卷 351-356页

作者： Qing Ye Zhi-Meng Guo Jian-Ling Bai Bo-Xin Lu Jun-Pin Lin Jun-Jie Hao Ji Luo Hui-Ping Shao Institute for Advanced Materials and Technology University of Science and Technology Beijing State Key Laboratory of Advanced Metals and Materials University of Science and Technology Beijing

In this work, low-cost titanium was fabricated by gelcasting of titanium hydride powder. The effects of morphology and grain composition of powder raw material and solid loading on the rheological behavior of gelcasting slurry were studied. The degreasing, dehydriding and sintering behaviors of gelcasted green body were investigated by differential thermal analysis （DTA） and dilatometer. The results show that the solid loading of titanium hydride slurry reaches 50 vol%. Combination of dehydriding and sintering in one process accelerates the densification, and the relative sintered density of the final part achieves 96.5 %. In order to test the ability of gelcasting process for fabricating structural materials, a resin handle produced by 3D printing technology was used as a model and a titanium handle was successfully fabricated. Higher solid loading and better sinterability of titanium hydride powder promote manufacture of bulk titanium with high relative density, complex shape and well-defined microstructure.

关键词： Gelcasting titanium hydride Powder metallurgy Sintering titanium

Deformation behavior and microstructure evolution of titanium alloys with lamellar microstructure in hot working process: A review

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Journal of Materials Science & Technology 2020年第4期39卷 56-73页

作者： Pengfei Gao Mingwang Fu Mei Zhan Zhenni Lei Yanxi Li State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of High-Performance Precision Forming Technology and EquipmentSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityP.O.Box 542Xi’an710072China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

titanium alloys have been widely used in many industrial clusters such as automotive, aerospace and biomedical industries due to their excellent comprehensive properties. In order to obtain fine microstructures and favorable properties, a well-designed multi-step thermomechanical processing(TMP) is critically needed in manufacturing of titanium components. In making of titanium components,subtransus processing is a critical step to breakdown lamellar microstructure to fine-structure in hot working process and thus plays a key role in tailoring the final microstructure and properties. To realize this goal, huge efforts have been made to investigate the mechanisms of microstructure evolution and flow behavior during the subtransus processing. This paper reviews the recent experimental and modelling progresses, which aim to provide some guidelines for the process design and microstructure tailoring for titanium alloy research community. The characteristics of the initial lamellar microstructure are presented, followed by the discussion on microstructure evolution during subtransus processing. The globularization of lamellar α is analyzed in detail from three aspects, i.e., globularization mechanism, heterogeneity and kinetics. The typical features of flow behaviors and the explanations of significant flow softening are then summarized. The recent advances in modelling of microstructure evolution and flow behaviors in the subtransus processing are also articulated. The current tantalized issues and challenges in understanding of the microstructure evolution and flow behaviors of the titanium alloys with lamellar microstructure are presented and specified in future exploration of them.

关键词： titanium alloys Lamellar microstructure Deformation behavior Microstructure evolution

Two-stage cyclic ammonium sulfate roasting and leaching of extracting vanadium and titanium from vanadium slag

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Chinese Journal of Chemical Engineering 2022年第7期35卷 39-47页

作者： Qing Lin Guoquan Zhang Kun Wang Dongmei Luo Siyang Tang Hairong Yue School of Chemical Engineering Sichuan UniversityChengdu 610065China

Compared with traditional sodium or calcification roasting process for vanadium extraction from raw vanadium slag(V-slag),ammonium sulfate(AS)roasting could reduce about 470℃ roasting temperature and avoid Cl_(2),HCl,sodium-containing waste-water and waste gypsum *** reduce the amount of AS added in vanadium extraction process,an efficient AS two-stage cyclic roasting and acid leaching process was *** result of TG analysis indicates V-slag could be decomposed in 275-380℃ using AS roasting *** 2.03:1 total mass ratio of AS to V-slag,90.86%V and 80.54%Ti could be extracted after 380℃ roasting for 30 min and 8%initial concentration of H_(2)SO_(4) leaching at 70℃ for 100 *** analysis indicates V-containing spinel phase in the 1st stage leaching residue would be efficiently decomposed by the cyclic two-stage roasting and leaching ***,the valence of V(Ⅲ)in raw V-slag was not changed after the 1st AS roasting stage,but a part of V(Ⅲ)in the 1st leaching residue was oxidized to V(V)after 2nd roasting process.

关键词： Vanadium titanium Roasting Leaching

Effects of laser phase transformation hardening parameters on heat input and hardened-bead profile quality of unalloyed titanium

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Transactions of Nonferrous Metals Society of China 2010年第6期20卷 1078-1091页

作者： D.S.BADKAR K.S.PANDEY G.BUVANASHEKARAN Maulana Azad National Institute of Technology Welding Research Institute Bharat Heavy Electricals Limited

Laser transformation hardening(LTH)of unalloyed titanium of 1.6 mm-thick sheet,nearer to ASTM Grade 3 of chemical composition was investigated using 2 kW CW Nd:YAG *** effects of laser power(750-1 250 W),scanning speed(1 000-3 000 mm/min)and focal point position(from-10 to-30 mm)on the heat input,and hardened-bead geometry(*** bead width(HBW),hardened depth(HD)and angle of entry of hardened bead profile with the surface(AEHB))were investigated using response surface methodology(RSM).The experimental plan is based on Box-Behnken design matrix *** and quadratic polynomial equations for predicting the heat input and the hardened bead geometry were *** results indicate that the proposed models predict the responses adequately within the limits of hardening parameters being *** is suggested that regression equations can be used to find optimum hardening conditions for desired criteria.

关键词： laser transformation hardening response surface methodology(RSM) unalloyed titanium titanium hardened-bead profile

Antibacterial ability and biocompatibility of fluorinated titanium by plasma-based surface modification

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Rare Metals 2022年第2期41卷 689-699页

作者： Mian Chen Xiao-Qiao Wang Er-Lin Zhang Yi-Zao Wan Jian Hu Jiangxi Key Laboratory of Nanobiomaterials Institute of Advanced MaterialsEast China Jiaotong UniversityNanchang 330013China Key Laboratory for Anisotropy and Texture of Materials(ATM) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China

Biomaterial surfaces with satisfied antibacterial activity and appropriate cytocompatibility are a pressing clinical need for orthopedic and dental *** biomaterials have been demonstrated to obtain antibacterial activity and osteogenic property,while the effect of fluorine chemical compositions on antibacterial property and cytocompatibility is rarely *** this end,the coatings with different fluorine chemical compositions on titanium surface were prepared by plasma treatment to verify the antibacterial ability and cytocompatibility of fluorinated *** antibacterial ability was evaluated by using Staphylococcus aureus,and the cell compatibility was investigated with MC3T3-E1 cells in *** results show that both fluorocarbon coating and metal fluorides coating exhibited a hydrophilic and nano-scaled *** than the fluorocarbon coating,the coating composed of metal fluorides presented satisfied bactericide effect and excellent *** antibacterial mechanism is associated with the metal fluorides and released fluoride *** work would provide novel sight in optimizing the surface modification method of fluorinated biomaterials for biomedical applications.

关键词： titanium Plasma-based technology Fluorine Antibacterial property Cytocompatibility