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Science China(Technological Sciences) 2018年第9期61卷 1340-1345页

作者： WANG Bo ZHANG HaoBiao HUANG LuJun HE JianLi ZHANG YouFeng WANG Wei School of Materials Engineering Shanghai University of Engineering Science Shanghai 201620 China Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology Shanghai 201620 China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

The Ti Bw reinforced near-α titanium matrix composite（Ti-5.8 Al-3.4 Zr-4.0 Sn-0.4 Mo-0.4 Nb-0.4 Si-0.06 C） was successfully synthesized by powder metallurgy and hot extrusion route. The effects of solution and aging temperature on the microstructure and high temperature tensile properties of the composite were investigated. The results revealed that the fine transformed β phase can be obtained by the solution treatment at β phase region and aging treatment, no other precipitates were observed. The α2 phase（Ti3 Al） can be acquired when the solution treated at α＋β phase region followed by aging treatment. With increasing the aging temperature from 500 to 700℃ for 5 h, the size of α2 precipitates increases from about 5 to about 30 nm. The Ti Bw are stable without any interfacial reaction during the heat treatments. The high temperature tensile properties show that the composite performed by solution and aging treatment exhibits good strengthening effects. With increasing the aging temperature from 500 to 700℃, the strength of the composite increases at the expense of elongation due to the increment of α2 *** strength of the composite at 600℃ increases by 17% to 986 MPa after 1000℃/2 h/AC and 700℃/5 h/AC heat treatment.

关键词： titanium matrix composite solution aging precipitate microstrueture high temperature tensile property

Microstructure and dry sliding wear behavior of as-cast TiCp/Ti-1100-0.5Nb titanium matrix composite at elevated temperatures

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China Foundry 2020年第6期17卷 455-463页

作者： Chao-zhi Li Bin-guo Fu Tian-shun Dong Jin-hai Liu Ying-jun Song Xue-bo Zhao Guo-lu Li School of Materials Science and Engineering Hebei University of TechnologyTianjin 300130China Tianjin Astronautics Hydraulic Equipment Co. Ltd.Tianjin 300462China

The microstructure and dry sliding wear performance of as-cast TiCp/Ti-1100-0.5Nb composite at 25℃,500℃ and 600℃ were systematically *** show that the solidification matrix microstructure is the typical Widmanst?tten *** eutectic TiC particles are uniformly distributed in the matrix in the form of feathery,long rod and strip-like ***,the interface between TiC and titanium matrix is clear and without any *** wear rate of TiCp/Ti-1100-0.5Nb at 600℃ and 500℃ is reduced by 95.8%and 79.9%,respectively,compared with that of the value of 51.8×10^-6 mm^3·mm^-1 at 25℃.The friction coefficient of the steady-state period at 25℃,500℃,600℃ is 0.48,0.8,1.2,respectively,and the variation extent of the friction coefficient at elevated temperatures is greater than at 25℃.The wear mechanism is changed from the mixture of adhesive wear and abrasive wear to mild oxidation wear with rising *** can also be concluded that the composite possesses excellent high temperature wear *** high-wear resistance of the composite is attributed to the Fe2O3 and *** presence of Fe2O3 and TiO2 reduces the wear rate,increases the friction coefficient,and also improves the range-ability of the friction coefficient.

关键词： titanium matrix composite as-cast microstructure wear behavior wear mechanism

Effect of multilayer graphene/nano-Fe2O3 composite additions on dry sliding wear behavior of titanium matrix composites

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Journal of Iron and Steel Research International 2020年第9期27卷 1117-1126页

作者： Huang Xie Yun-xue Jin Mu-ye Niu Ji-heng Wang School of Material Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003JiangsuChina National Demonstration Center for Experimental Materials Science and Engineering Education(Jiangsu University of Science and Technology) Zhenjiang 212003JiangsuChina

The wear tests of titanium matrix composites(TMCs)at the loads of 50,100,120,and 150 N were carried out with an MMW-1 vertical universal friction and wear tester to study the addition of multilayer graphene(MLG)/nano-Fe2O3 composites(0,0.1,0.2,0.3,0.4,and 0.5 g)on the dry sliding wear behavior of *** presented a marked variation in wear loss as a function of the amount of MLG/Fe2O3 addition,and a significant decrease in the friction coefficient was obtained,reducing this parameter up to 50%.With the rise and fall of wear loss,TMCs underwent a transition from severe wear to mild *** phenomena were attributed to the existence of a protective lubricating film,which prevented the surface from coming in direct contact,and the lubricating film was 15-20μm thick and made up of MLG/Fe2O3(1:2)*** structure was speculated to be similar to a rolling wood.

关键词： titanium matrix composite Graphene Nanomaterial Lubricating film Wear behavior

Mechanical properties and thermal deformation behavior of low-cost titanium matrix composites prepared by a structure-optimized Y_(2)O_(3) crucible

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Journal of Iron and Steel Research International 2024年第3期31卷 738-751页

作者： Qian Dang Gang Huang Ye Wang Chi Zhang Guo-huai Liu Zhao-dong Wang The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150004HeilongjiangChina School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina

A porous yttrium oxide crucible with both thermal shock resistance and erosion resistance was developed by structural *** structure-optimized yttrium oxide crucible was proved to be suitable for melting highly reactive titanium ***-cost(TiB+Y2O_(3))-reinforced titanium matrix composites were prepared by vacuum induction melting using the prepared *** thermal deformation behavior and microstructure evolution of(TiB+Y2O_(3))-reinforced tita-nium matrix composites were investigated at deformation temperatures of 900-1100℃with strain rates of 0.001-1 *** results showed that the prepared yttrium oxide crucible had both thermal shock and erosion resistance,the low-cost titanium matrix composites could be prepared by the developed yttrium oxide crucibles which were homogeneous in composition and highly sensitive to strain rate and deformation temperature,and the peak and theological stresses decreased with increasing deformation temperature or decreasing strain *** addition,the average thermal deformation activation energy of the composites was calculated to be 574.6 kJ/mol by establishing the Arrhenius constitutive equation in consideration of the strain variables,and the fitting goodness between the predicted stress value and the measured value was 97.624%.The calculated analysis of the hot processing map showed that the best stable thermal deformation zone was located in the deformation temperature range of 1000-1100℃and strain rate range of 0.001-0.01 s^(-1),where the peak dissipation coefficient wasη=71%.In this zone,the deformation of the reinforcement and matrix was harmonious,the reinforcement was less likely to fracture,dynamic recrystallization occurred more fully and the alloy exhibited near steady rheological characteristics.

关键词： Yttrium oxide crucible titanium matrix composite Thermal deformation behavior Constitutive equation Hot processing map Microstructure evolution

Fatigue Crack Initiation and Propagation Dominated by Crystallographic Factors in TiB/near α-Ti composite

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Acta Metallurgica Sinica(English Letters) 2024年第5期37卷 763-776页

作者： Fanchao Meng Rui Zhang Shuai Wang Fengbo Sun Run Chen Lujun Huang Lin Geng School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Waikato Centre for Advanced Materials and Manufacturing School of EngineeringUniversity of WaikatoHamilton 3240New Zealand State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

Discontinuously reinforced titanium matrix composites(DRTMCs)with a network structure have been extensively researched due to their superior combination of strength and ***,their fatigue performance has remained *** order to elucidate the fatigue behavior of DRTMCs,a tension-tension fatigue test was performed on a TiB/nearα-Ti composite with network *** results showed that the variability of fatigue lifetime increased as the stress level *** analysis indicated that fatigue crack initiation was associated with facet formation,while the subsequent propagation was hindered by the network structure comprising TiB whiskers and *** characterization further revealed that facets formed due to a combination of shear and normal *** reduction in fatigue lifetime was attributed to an increase in the effective slip length,which was influenced by the orientation of grains near the crack-initiation sites toward basal slip in the life-limiting *** in situ observation suggested that the crack initiation was facilitated by both basal and prismatic slip ofα-Ti as well as fracture of *** propagation was found to be associated with basal and prismatic slip systems with high Schmid factors,regardless of whether the crack was intergranular or intragranular.

关键词： titanium matrix composite TiBw Fatigue lifetime variability Crack initiation Crack propagation

Tool wear during high speed turning in situ TiC_p/TiB_w hybrid reinforced Ti-6Al-4V matrix composite

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Chinese Journal of Aeronautics 2016年第5期29卷 1425-1435页

作者： Ge Yingfei Xu Jiuhua Huan Haixiang School of Mechanical Engineering Nanjing Institute of Technology College of Mechanical & Electrical Engineering Nanjing University of Aeronautics & Astronautics

Chipping, adhesive wear, abrasive wear and crater wear are prevalent for both the polycrystalline diamond （PCD） and the carbide tools during high speed turning of TiCp/TiBw hybrid reinforced Ti-6Al-4V （TC4） matrix composite （TMCs）. The combined effects of abrasive wear and diffusion wear caused the big crater on PCD and carbide tool rake face. Compared to the PCD, bigger size of crater was found on the carbide tool due to much higher cutting temperature and the violent chemical reaction between the Ti element in the workpiece and the WC in the tool. However, the marks of the abrasive wear looked much slighter or even could not be observed on the carbide tool especially when low levels of cutting parameters were used, which attributes to much lower hardness and smaller size of WC combined with more significant chemical degradation of carbide. When cutting TC4 using PCD tool, notch wear was the most significant wear pattern which was not found when cutting the TMCs. However, chipping, adhesive wear and crater wear were much milder when compared to the cutting of titanium matrix composite. Due to the absence of abrasive wear when cutting TC4, the generated titanium carbide on the PCD protected the tool from fast wear, which caused that the tool life for TC4 was 6-10 times longer than that for TMCs.

关键词： Carbide tool High speed cutting PCD tool titanium matrix composite Tool wear Turning

Mechanical and tribological properties of graphene nanoplatelets-reinforced titanium composites fabricated by powder metallurgy

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Journal of Iron and Steel Research International 2020年第11期27卷 1357-1362页

作者： Zhen Cao Jiong-li Li Hai-ping Zhang Wen-bo Li Xu-dong Wang AECC Beijing Institute of Aeronautical Materials Beijing 100095China Beijing Institute of Graphene Technology Beijing 100094China Beijing Engineering Research Centre of Graphene Application Beijing 100095China

titanium matrix composite reinforced by graphene nanoplatelets(GNPs)was fabricated via powder metallurgy *** isostatic pressing and hot extrusion were used to consolidate the mixed powder of GNPs and TC4 titanium(Ti)*** microstructures,mechanical properties and sliding wear performance of Ti/GNPs composite had been researched to evaluate the rein forcing effect of GNPs on tita nium *** observation indicates that GNPs could restrain grai n growth slightly in titanium *** matrix and graphene exhibit a clean and firm interface formed by means of metallurgical bonding on atomic *** with the monolithic titanium alloy,the composite with 1.2 vol.%GNPs exhibits significantly improved elastic modulus and *** sliding wear test shows that there is an obvious enhancement in the tribological performance of Ti/GNPs composite with 1.2 vol.%*** results of this work indicate that GNP is an efficient reinforcenient material in titanium *** strengthening mechanism including precipitates strengthening,load transfer and grain refinement mechanism of GNPs in titanium matrix was discussed.A modified shear-lag model was used to analyze the reinforcement contribution of the stress transfer *** calculation shows that the stress load mechanism constitutes the main strengthening mechanism in Ti/GNPs composite.

关键词： titanium matrix composite Graphene Mechanical testing Tribological property Powder metallurgy

Effect of C/Mo Duplex-coating on Thermal Residual Stresses in SiCf/Ti2AlNb composites

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Journal of Wuhan University of Technology(Materials Science) 2021年第4期36卷 526-532页

作者： ZHU Tangkui WANG Degui LUO Xian School of Electromechanical and Information Technology Yiwu Industrial and Commercial CollegeYiwu 322000China School of Materials Science Northwestern Polytechnical UniversityXi'an 710072China

Three-dimensional finite element physical models considering the layered distribution of materials at the interface were developed to study the effect of the coating system on distributions of thermal residual stresses in SiCf/Ti2AlNb *** coating systems were comparatively studied,namely C coating and C/Mo *** thermal residual stresses after 1 080 ℃/1 h solution treatment and 800 ℃/20 h ageing treatment in the composites were also *** experimental results show that Mo coating can decrease thermal residual stress magnitude in the ***,it would increase the thermal residual stresses in the interfacial reaction layer of *** change of radial thermal residual stress in TiC layer is inconspicuous after solid solution and ageing treatment,but the hoop and axial thermal residual stresses increase ***,the heat treatment can obviously reduce hoop and axial thermal residual stresses of the matrix,which is benefit to restrain the initiation and propagation of cracks in the matrix.

关键词： finite element simulation titanium matrix composite SiC fiber thermal residual stress

Microstructure and interface thermal stability of C/Mo double-coated SiC fiber reinforced γ-TiAl matrix composites

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Transactions of Nonferrous Metals Society of China 2016年第5期26卷 1317-1325页

作者：罗贤李超杨延清许海嫚李晓宇刘帅李鹏涛西北工业大学凝固技术国家重点实验室西安710072

C/Mo duplex coating interfacially modified SiC fiber-reinforced γ-TiAl matrix composite （SiCf/C/Mo/γ-TiA1） was prepared by foil-fiber-foil method to investigate its interfacial modification effect. SiCf/C/TiAl composites were also prepared under the same processing condition for comparision. Both kinds of the composites were thermally exposed in vacuum at 800 and 900℃ for different durations in order to study thermal stability of the interfacial zone. With the aids of scanning electron microscope （SEM） and energy dispersive spectrometer （EDS）, the interracial microstructures of the composites were investigated. The results reveal that, although adding the Mo coating, the interfacial reaction product of the SiCf/C/Mo/TiAl composite is the same with that of the SiCf/C/TiA1 composite, which is TiC/Ti2AlC between the coating and the matrix. However, C/Mo duplex coating is more efficient in hindering interfacial reaction than C single coating at 900 ℃ and below. In addition, a new layer of interfacial reaction product was found between Ti2AlC and the matrix after 900 ℃, 200 h thermal exposure, which is rich in V and close to the chemical composition of B2 phase.

关键词： Mo coating TiAl alloy SiC fiber titanium matrix composite interracial reaction thermal stability

Effect of solid carburization on surface microstructure and hardness of Ti-6Al-4V alloy and(TiB+La_2O_3)/Ti-6Al-4V composite

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Transactions of Nonferrous Metals Society of China 2016年第7期26卷 1871-1877页

作者：段宏强韩远飞吕维洁毛建伟王立强张荻上海交通大学金属基复合材料国家重点实验室上海200240

Solid carburization was employed to improve the hardness of Ti-6Al-4V alloy and （TiB＋La2O3）/Ti composite. The samples wrapped in graphite powder were placed in sealed quartz tubes, followed by solid carburization at 1227 K for 24 h. Microstructure and phase analysis indicated that TiC reinforcements and Ti-C solid solutions were introduced after solid carburization. Moreover, the volume fraction of equiaxedα-Ti phase in diffusion layer decreased obviously with increasing sample depth. Hardness testing results indicated that both the carburized surfaces performed significant improvement of about 100% in micro-hardness compared with untreated materials. The variation of carbon contents with increasing sample depth resulted in a hardened layer of 300 μm in the carburized samples. Meanwhile, slight influence on the internal microstructure and hardness indicated that solid carburization was an effective method in strengthening the surface of titanium alloy and titanium matrix composite.

关键词： titanium alloy titanium matrix composite solid carburization microstructure micro-hardness