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Interconnected microstructure and flexural behavior of Ti_(2)C-Ti composites with superior Young’s modulus

International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 2088-2101页

作者： Fengbo Sun Rui Zhang Fanchao Meng Shuai Wang 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 Precision Welding&Joining of Materials and Structures Harbin Institute of TechnologyHarbin 150001China

To enhance the Young’s modulus(E)and strength of titanium alloys,we designed titanium matrix composites with intercon-nected microstructure based on the Hashin-Shtrikman *** to the results,the in-situ reaction yielded an interconnected microstructure composed of Ti_(2)C particles when the Ti_(2)C content reached 50vol%.With widths of 10 and 230 nm,the intraparticle Ti lamellae in the prepared composite exhibited a bimodal size distribution due to precipitation and the unreacted Ti phase within the grown Ti_(2)C *** composites with interconnected microstructure attained superior properties,including E of 174.3 GPa and ultimate flexural strength of 1014 *** with that of pure Ti,the E of the composite was increased by 55% due to the high Ti_(2)C content and interconnected *** outstanding strength resulted from the strong interfacial bonding,load-bearing capacity of interconnected Ti_(2)C particles,and bimodal intraparticle Ti lamellae,which minimized the average crack driving *** flexural tests revealed preferential crack initiation along the{001}cleavage plane and grain boundary of Ti_(2)C in the region with the highest tensile *** addition,the propagation can be efficiently inhibited by interparticle Ti grains,which prevented the brittle fracture of the composites.

关键词： titanium matrix composites titanium carbide interface Young’s modulus flexural behavior

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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

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Hot deformation behavior and microstructure evolution of GH3536-TiB_(2) composites fabricated by powder metallurgy

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Science China(Technological Sciences) 2024年第7期67卷 2107-2124页

作者： ZHOU ShiPeng WANG Shuai huang lujun ZHANG Rui CHEN Xin MENG FanChao CHEN Run SUN FengBo WANG CunYu GENG Lin 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

The hot deformation behavior and microstructure evolution of GH3536-TiB2composites fabricated by powder metallurgy(PM)were examined in the temperature range of 950–1150℃ and strain rate range of 0.001–1 s^(-1). The hot compression stress-strain curves and the constitutive equation were obtained. In addition, the hot processing map was drawn, which indicated that the appropriate hot working window was 950–1050℃/0.001–0.1 s^(-1)and 1050–1100℃/0.001–0.01 s^(-1). The microstructure analysis showed that the splitting and spheroidization of M3B2led to a decrease in size and volume fraction at 950–1100℃. At 1150℃,the eutectic microstructure of M_(3)B_(2)+ γ was formed due to the dissolution of M_(3)B_(2), which caused macroscopic cracking of the deformed sample. Additionally, the deformation temperature and the strain rate had little effect on the size and volume fraction of M_(3)B_(2). Besides, discontinuous dynamic recrystallization(DDRX) and continuous dynamic recrystallization(CDRX) were found in the deformed microstructure, while the former was dominant. Within the test range of this work, the dynamic recrystallization(DRX) fraction of the deformed composites was high due to the bulging nucleation of numerous interfaces. The DRX grain size increased with increasing deformation temperature or decreasing strain rate. Texture analysis showed that the deformation texture of //compression direction RD existed in the matrix when the deformation temperature was below 1100℃, and the texture type became //RD at 1100℃. Additionally, it was also found that the //RD texture was formed in M3B2under the strain rates of 0.1 and 0.01 s^(-1).

关键词： GH3536 alloy matrix composites powder metallurgy hot deformation behavior microstructure evolution

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Atomistic origin of high grain boundary resistance in solid electrolyte lanthanum lithium titanate

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Journal of Materiomics 2024年第6期10卷 1214-1221页

作者： Shang Peng Yongjin Chen Xuefeng Zhou Mingxue Tang Jianbo Wang Hua Wang Lin Guo lujun huang Wenge Yang Xiang Gao Center for High Pressure Science and Technology Advanced Research(HPSTAR) Beijing100094China School of Physics and Technology Center for Electron MicroscopyMOE Key Laboratory of Artificial Micro-and Nano-structuresand Institute for Advanced StudiesWuhan UniversityWuhan430072China School of Chemistry Beijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing100191China School of Materials Science and Engineering Harbin Institute of TechnologyP.O.Box 433Harbin150001China

Lanthanum lithium titanate is one of the promising electrolytes for solid-state lithium-ion batteries due to its high bulk ionic conductivity up to∼10^(−3) S/***,the practical application of this material has been bottlenecked by high grain boundary(GB)resistance,while the underlying mechanism is still under *** we report a comprehensive study with direct evidence to reveal the origin of high GB resistance in La_(2/3)–xLi_(3x)TiO_(3)(LLTO).Atomic-scale observations via advanced scanning transmission electron microscopy show that the GBs are uniformly subject to subsurface segregation of La atoms to compensate for the excess surface *** La segregation leads to an abrupt decrease of charge carrier concentration neighboring GBs and hence is supposed to have deleterious effect on GB *** findings suggest a novel mechanism of space-charge-induced cation segregation,which shed lights on the intrinsic origin of low GB ionic conductivity in LLTO.

关键词： Space-charge layer Cation segregation Intergranullar glassy film Solid-state electrolyte Ionic conductivity

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High Temperature Properties of Discontinuously Reinforced Titanium Matrix Composites:A Review

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Acta Metallurgica Sinica(English Letters) 2014年第5期27卷 787-797页

作者： Lin Geng lujun huang School of Materials Science and Engineering Harbin Institute of Technology

Further improvement on high temperature durability is one of the most important aims except for high specific strength, high specific stiffness, and excellent wear resistance, to design and fabricate discontinuously reinforced titanium matrix composites （DRTMCs）. Their superior properties render them extensive application potential in aerospace and military industries due to the urgent demand for the materials with characteristics of lightweight, high strength, high stiffness and high temperature durability. With development on fabrication methods and room temperature properties, testing, characterizing, evaluating and further increasing high temperature properties of DRTMCs are becoming more and more important to promote their applications. This review provides insights and comprehensions on the high temperature tensile properties, superplastic tensile properties, creep behaviors, and high temperature oxidation behaviors of DRTMCs,

关键词： Titanium matrix composites High temperature tensile properties Creep behaviors Oxidation behaviors Superplasticity

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超声冲击对增材制造组织改善及强化机理影响的研究进展

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金属学报 2024年第3期60卷 273-286页

作者：孙徕博黄陆军黄瑞生徐锴武鹏博龙伟民姜风春方乃文中国机械总院集团哈尔滨焊接研究所有限公司哈尔滨150028 哈尔滨工业大学材料科学与工程学院哈尔滨150001 郑州机械研究所有限公司新型钎焊材料与技术国家重点实验室郑州450001 哈尔滨工程大学烟台研究院烟台264000

增材制造作为一种快速发展的先进技术已在制造业领域得到广泛应用,但在金属制件增材制造过程中存在的晶粒粗大、组织方向性明显等问题制约了该技术的发展。超声冲击处理作为一种强化手段,因其能够有效改善增材制造金属制件应力状态、细... 详细信息

增材制造作为一种快速发展的先进技术已在制造业领域得到广泛应用,但在金属制件增材制造过程中存在的晶粒粗大、组织方向性明显等问题制约了该技术的发展。超声冲击处理作为一种强化手段,因其能够有效改善增材制造金属制件应力状态、细化组织并提高其综合性能等特点而得到认可。本文从超声冲击在金属增材制造过程中对组织的作用机制和强化机理出发,总结了基于表面塑性变形实现增材制造强化的理论观点及局限性,阐述了超声冲击和增材制造复合作用下的组织细化机理和柱状晶向等轴晶转变机制,最后提出了超声冲击辅助金属增材制造强化理论建立过程中仍需进行深入研究的问题及建议。

关键词：超声冲击处理增材制造强化机制组织转变机理

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Synthesis and Characterization of In Situ(Al_2O_3–Si)/Al Composites by Reaction Hot Pressing

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Acta Metallurgica Sinica(English Letters) 2014年第5期27卷 930-936页

作者： El Oualid Mokhnache Guisong Wang Lin Geng Balasubramaniam Kaveendran lujun huang School of Materials Science and Engineering Harbin Institute of Technology

In situ （Al2O3-Si）/Al composites with a reinforcement volume fraction of 10% were synthesized from the Al-SiO2 system using low energy ball milling and reaction hot pressing. Differential thermal analysis was used to investigate the reaction mechanisms between SiO2 and Al. X-ray diffraction results revealed that the reaction between Al and SiO2 took place completely at 900 ℃ with a holding time of 2 h, thereby forming Al2O3 and Si. Scanning electron microscopic, energy dispersive X-ray spectroscopic, and transmission electron microscopic （TEM） results showed that the in situ synthesized A1203 and Si particles, whose sizes are less than 2 μm, were polygonal in shape and dispersed uniformly in the matrix. Moreover, Al2O3 particle size showed a tendency to increase from - 2 to - 6 μm when the synthesis temperature was increased. Furthermore, TEM observation showed that the interface between the reinforcements and Al matrix is clean. The yield strength, ultimate tensile strength, and Brinell hardness of the in situ （Al2O3-Si）/Al composite was significantly higher than the aluminum matrix. Mechanisms governing the tensile fracture process are discussed.

关键词： Al composites Microstructure Al2O3 Silicon

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选区激光熔化成形2%TiB_(w)/TA15复合材料的显微组织与性能

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中国有色金属学报 2024年第4期34卷 1164-1178页

作者：贾畅颖安琦王存玉张芮崔丽华陈润孙枫泊黄陆军耿林哈尔滨工业大学材料科学与工程学院哈尔滨150000

本文通过选区激光熔化成形技术(Selective laser melting,SLM)制备原位自生2%(体积分数)TiB_(w)/TA15钛基复合材料,探究激光功率和扫描速率对该复合材料的显微组织和室温/高温力学性能的影响规律,并揭示其强化机理。结果表明:SLM-2%TiB_... 详细信息

本文通过选区激光熔化成形技术(Selective laser melting,SLM)制备原位自生2%(体积分数)TiB_(w)/TA15钛基复合材料,探究激光功率和扫描速率对该复合材料的显微组织和室温/高温力学性能的影响规律,并揭示其强化机理。结果表明:SLM-2%TiB_(w)/TA15复合材料中存在孔隙缺陷,其数量随激光功率的降低和扫描速率的增大而增加。该复合材料基体由一定生长方向的原始柱状β晶和细小层片状α相组成,TiB晶须呈弥散分布;其抗拉强度随激光功率的增大而减小,随扫描速率的增大而增大,最高室温抗拉强度为1337.8 MPa,与SLM-TA15合金相比提高了15.1%;600℃抗拉强度最高值为651.1 MPa,与SLM-TA15合金相比提高了10.1%。复合材料的维氏硬度最高为403.21HV,显著高于SLM-TA15合金(345.3HV)。该复合材料强度提升的主要强化机制为载荷传递强化、热错配强化和细晶强化。

关键词： TiB_(w)/TA15复合材料选区激光熔化显微组织力学性能强化机理

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Interfacial reaction mechanism of TiBw/Ti6Al4V composites and Inconel 718 alloys by GTAW heat transmission

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Science China(Technological Sciences) 2019年第12期62卷 2293-2301页

作者： GAO YaNan huang lujun SUN Yuan AN Qi ZHANG Jie GENG Lin State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Institute of Metal Research Chinese Academy of SciencesSheryang 110016China

A good joint of Ti Bw/Ti6Al4V composites and Inconel 718 alloys was obtained by Gas Tungsten Arc Welding(GTAW) heat transmission. The interfacial reaction mechanism of joint was investigated and analyzed in details. Owing to the heat input applied on the surface of Ti Bw/Ti6Al4V composites, a solid-state reaction layer appeared at the interface of Ti Bw/Ti6Al4 V composites to Inconel 718 alloys. The thickness of the reaction layer was obviously increased with increasing heat *** of reaction layer mainly depended on the diffusion of elements of Ti and Ni through the interface during welding to form solid solutions and intermetallic compounds(IMCs). The reaction layer can be divided into Ti-rich zone(layer 2) and Nirich zone(layer 1). In Ni-rich zone, relatively coarse dendrites were the predominant, however, more brittle IMCs like Ti2Ni were found in the Ti-rich zone. Micro hardness of reaction layer was much higher than that of base metal. While a slight decrease of hardness was found between Ti-rich zone and Ni-rich zone due to the formation of TiNi.

关键词： TiBw/Ti6Al4V composites Inconel 718 alloys interfacial reaction heat transmission microstructures

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Microstructure evolution and improved properties of laminated titanium matrix composites with gradient equiaxed grains

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Science China(Technological Sciences) 2020年第12期63卷 2687-2697页

作者： WANG Shuai huang lujun JIANG Shan ZHANG Rui AN Qi SUN Yuan GENG Lin School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

With the purpose of improving both the strength and ductility,gradient equiaxed grains were successfully achieved in the matrix of the laminated TiB/Ti-TiB/Ti-6.58Al-1.76Zr-1.04V-0.89Mo composite via water quenching(WQ) and thermal compressing deformation. Gradient equiaxed grains varied from approximately 1.0 μm in TiB/Ti-6.58Al-1.76Zr-1.04V-0.89Mo layer to 5.5 μm in TiB/Ti layer. The formation of the gradient structure was related to the alloying elements diffusion during the initial sintering process,and the equiaxed shape was constructed by dynamic recrystallization during thermal compressing. WQ treatment before thermal compressing was adopted to obtain fine lamellar structure,which promoted the segmentation of αlamellae,and accelerated the dynamic recrystallization process. Raising the quenching temperature can increase the proportion of equiaxed grains in the composite,which improved both the bending strength and ductility. Compared with the as-sintered specimen,the specimen with gradient equiaxed grains exhibited nearly 30% enhancement in flexural strength(from 1719 to 2218 MPa),and the ultimate bending fracture strain was increased from 7.0% to 17.2%. This significant improvement should be attributed to the coordination deformation by interface gradient grains,the grain refinement strengthening and the good balance between strength and ductility of the recrystallized equiaxed grains.

关键词： titanium matrix composites laminated structure gradient equiaxed grains microstructure evolution dynamic recrystallization bending properties

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