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Fabrication of Graphene Nanoplates Modified with Nickel Nanoparticles for Reinforcing Copper Matrix Composites

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Acta Metallurgica Sinica(English Letters) 2020年第5期33卷 643-648页

作者： Tielong Han Jiajun Li naiqin zhao chunnian he School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials Tianjin UniversityTianjin 300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin UniversityTianjin 300072China

In order to improve the interface wettability as well as the interfacial bonding between graphene and copper matrix,in this work,graphene nanoplates modified with nickel nanoparticles(Ni-GNPs)were synthesized using a one-step method based on spray-drying and chemical vapor ***,0.33 wt%Ni-GNPs were introduced into copper matrix composite by the molecular-level mixing method,leading to further enhancement of 90%in yield *** is attributed to the presence of Ni-GNPs,which provided high resistance to matrix against *** addition,with the modification of nickel at the interface,the wettability and interfacial bonding between graphene nanoplates and copper matrix were improved,which enhanced the load transfer ***,the microstructures and strengthening mechanisms were investigated and discus sed meanwhile.

关键词： Carbon materials Composite materials Chemical vapor deposition Nanocomposites

Copper-Coated Graphene Nanoplatelets-Reinforced Al–Si Alloy Matrix Composites Fabricated by Stir Casting Method

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Acta Metallurgica Sinica(English Letters) 2021年第1期34卷 111-124页

作者： Xiaoqi Han Lizhuang Yang naiqin zhao chunnian he School of Materials Science and Engineering and Tianjin Key Laboratory of Composite and Functional Materials Tianjin UniversityTianjin 300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin UniversityTianjin 300072China

In this study,Cu nanoparticles-coated graphene nanoplatelets(Cu-NPs@GNPs)were synthesized by a simple in situ method with the assistance of Na Cl templates and used for reinforcing Al–10 Si composites through stir casting *** experimental results showed that the coating of Cu-NPs on the GNPs could compromise the density mismatch between GNPs and metal matrix and eff ectively hinder the float of GNPs during *** reaction of Cu-NPs and Al matrix could protect the structural integrity of GNPs as well as improve the interfacial wettability between GNPs and the matrix,thus promoting the uniform dispersion of GNPs in the *** a result,the as-prepared 0.5 wt%Cu-NPs@GNPs/Al–10 Si composite exhibited a tensile strength of 251 MPa(45%higher than the Al–10 Si)with a total elongation of 15%.The strengthening eff ects were mainly attributed to the following three reasons:Firstly,the Cu-NPs coating improved the interfacial bonding between GNPs and Al matrix which promoted the load transfer from the matrix to the ***,the nanoscale Al 2 Cu formed by the reaction of Cu-NPs and Al matrix played a role in precipitation ***,GNPs refined the silicon phases and improved the monolithic performances of the composites.

关键词： Al–Si alloy Graphene Stir casting Wettability Si phase refinement

Effect of GNPs on microstructures and mechanical properties of GNPs/Al-Cu composites with different heat treatment status

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Journal of Materials Science & Technology 2021年第33期92卷 1-10页

作者： Tielong Han Fucheng Wang Jiajun Li chunnian he.naiqin zhao School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials Tianjin UniversityTianjin 300072China Faculty of Materials and Manufacturing Key Laboratory of Advanced Functional MaterialsMinistry of Education of ChinaBeijing University of TechnologyBeijing 100124China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin UniversityTianjin 300072China

Microstructural and mechanical behavior of heat treatable Al-4.6Cu binary alloy reinforced with graphene nanoplates(GNPs) in different heat treatment status were investigated in this *** addition of GNPs significantly enhanced the yield strength and tensile strength of Al-Cu alloy regardless of the heattreatment *** was also found that GNPs accelerated the formation of precipitates,leading to a greatly shortened aging time for GNPs/Al-4.6Cu composite to reach the peak ***,aging treatment enhanced the strength of GNPs/Al-Cu composite very little,which could be explained by the interaction between GNPs,precipitates and *** work inspires us that the heat treatment process of aluminum alloy matrix composites should be designed independently with the matrix in quest of an optimum performance.

关键词： Metal matrix composites Al-Cu alloy Graphene nanoplates heat treatment

A bottom-up strategy toward metal nano-particles modified graphene nanoplates for fabricating aluminum matrix composites and interface study

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Journal of Materials Science & Technology 2020年第11期42卷 21-32页

作者： Tielong Han Enzuo Liu Jiajun Li naiqin zhao chunnian he School of Materials Science and Engineering Tianjin Key Laboratory of Composites and Functional MaterialsTianjin UniversityTianjin 300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin UniversityTianjin 300072China

To synthesize graphene economically and efficiently,as well as to improve the interface bonding between graphene and metal and to recede the aggregation issue of graphene,in this work,an easy and scalable bottom-up strategy for the mass production of metal nanoparticles modified graphene nanoplates(GNPs)was *** nanoparticles modified GNPs(Cu-GNPs)and Ni nanoparticles modified GNPs(Ni-GNPs)were fabricated through this method,and then compounded with Al via ball milling *** asobtained Ni-GNPs/Al composite showed simultaneously improved strength and toughness compared with unreinforced Al,while the Cu-GNPs/Al composite presented a greater strengthening *** microstructure and interface of the two composites were carefully characterized and investigated to reveal the *** principle study was also adopted to explore the binding energy of different interface *** study could provide new insights into the fabrication of GNPs and the control of interface in GNPs/Al composites.

关键词： Graphene nanoplates(GNPs) Nanocomposites Metal-matrix composites(MMCs) Interface

Self-anchored catalysts for substrate-free synthesis of metal-encapsulated carbon nano-onions and study of their magnetic properties

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Nano Research 2016年第4期9卷 1159-1172页

作者： Chenguang Zhang Jiajun Li Chunsheng Shi chunnian he Enzuo Liu naiqin zhao School of Materials Science and Engineering Tianjin University Tianjin 300072 China Collaborative Innovation Center of Chemical Science and Engineering Tianjin University Tianjin 300072 China

We demonstrate the synthesis of a novel self-anchored catalyst structure containing a Fe-Ni alloy nanosheet generated by phase separation for the substrate-free synthesis of carbon nanostructures. Fast Fourier transform analysis was carried out in order to investigate both the phase and structural evolution of the alloy nanosheet during reduction and chemical vapor deposition （CVD） growth. y-Fe-Ni （Feo.64Nio.36） and a-Fe-Ni （kamacite） phases were formed and separated on the NiFe204 nanosheet catalyst precursor during H2 reduction, forming selfanchored mono-dispersed y-Fe-Ni nanocrystals on a a-Fe-Ni matrix. The Fe-Ni alloy nanosheet serves both as a catalyst for growing metal-encapsulated carbon nano-onions （CNOs）, and as a support for anchoring these preformed nano- particles, yielding mono-dispersed catalyst nanoparticles with no requirement of additional substrates for the CVD growth. This synthesis is capable of mitigating the coalescence and Ostwald ripening without the assistance of an additional substrate. This structure allows for the growth of uniform-sized CNOs despite the aggregation, crumbling, and stacking of the alloy sheet. This study provides a promising design for novel catalyst structures by phase separation towards the substrate-free synthesis of carbon nanostructures in large scale. Finally, the ferromagnetic Feo.64Ni0.36@#CNOs particles demonstrate their application in both magnetic storage and water purification, as a non-toxic water treatment material.

关键词： carbon nano-onion self-anchored catalyst phase separation y-Fe-Ni a-Fe-Ni chemical vapor deposition

Constructing the coherent transition interface structure for enhancing strength and ductility of hexagonal boron nitride nanosheets/Al composites

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Journal of Materials Science & Technology 2023年第14期145卷 235-248页

作者： Lishi Ma Xiang Zhang Yonghua Duan Siyuan Guo Dongdong zhao chunnian he.naiqin zhao School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin 300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China School of Material Science and Engineering Kunming University of Science and TechnologyKunming 650093China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin UniversityTianjin 300072China

The deformation incompatibility of components is a bottleneck restricting the exaltation of the strength and ductility of ***,the coherent transition interface was designed and produced in hexagonal boron nitride nanosheets(BNNSs)/Al composites by reaction sintering route,expecting to re-lieve the deformation incompatibility between BNNSs and *** is demonstrated that with the sintering temperature for composites raising from 600℃ to 650℃,700℃ and 750℃,different interface bonding characteristics,which involve nucleation and growth of AlN continuous nanolayer,were ***-thermore,first-principles calculations show that the generation of the coherent transition interface im-proved the interfacial bonding strength of BNNSs/Al composites through covalent *** composites with coherent transition interface exhibit excellent strength-toughness combination in tensile and impact *** finite element simulation and in-situ approach under tensile tests were applied to investigate the influence of transition interface structure on deformation behavior of BNNSs/Al *** is found that the generation of the transition interface can not only weaken the stress partitioning behavior in the elastic stage,but also constrain the crack initiation and propagation behavior in the elastic-plastic stage and plastic stage,thereby improving the deformation compatibility between BNNSs and *** present work provides a novel view into the breakthrough for the trade-offrelationship of strength and ductility by coherent transition interface design in nanocomposites.

关键词： Nanocomposites Al-BNNSs system In-situ interface reaction Coherent transition interface Strength and ductility

Manipulating mechanical properties of graphene/Al composites by an in-situ synthesized hybrid reinforcement strategy

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Journal of Materials Science & Technology 2022年第28期123卷 13-25页

作者： Lizhuang Yang Bowen Pu Xiang Zhang Junwei Sha chunnian he.naiqin zhao School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin 300072China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin UniversityTianjin 300072China

The structural deterioration caused by the relatively weak out-of-plane bending stiffness and the chemically-active edge area of graphene limits its outperformance in strengthening for Al matrix composites(AMCs).Introducing one-dimensional(1D)carbon nanotubes(CNTs)to graphene/metal system is one of the promised strategies to complement the weakness of 2D graphene and make full use of the outstanding intrinsic properties of the both *** date,such synergistic strengthening and toughening mechanisms are largely *** this study,AMCs reinforced by a novel hybrid reinforcement,i.e.,graphene nanosheets decorated with Cu nanoparticles and CNTs(Cu@GNS-CNTs),are fabricated by an in-situ synthesis *** combined contrast experiments validated that the organically integrated reinforcing structure promotes the intrinsic load bearing capacity of GNS and the strain hardening capability of the Al matrix *** a result,the composites achieved excellent tensile strength and uniform elongation with almost no *** strengthening mechanism originated primarily from the hybrid reinforcement exhibits superior load-transfer,fracture inhibition and dislocation storage capability by controlling the interface reaction to construct an effective interface structure without damaging the *** work identifies a promising structural modification strategy for 2D materials and provides mechanistic insights into the synergistic strengthening effect of graphene/CNTs hybrid reinforcement.

关键词： Metal-matrix composites(MMCs) Mechanical properties Graphene Synergistic strengthening Interface

高导电高耐热铜合金及铜基复合材料的研究现状与展望

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铸造技术 2024年第1期45卷 1-26页

作者：王佳睿张翔何春年赵乃勤天津大学材料科学与工程学院天津300350

高导耐热铜基材料作为现代高新技术用关键材料之一,已被广泛应用于轨道交通、电子通信和航空航天等领域。本文从铜合金和铜基复合材料两大领域入手,介绍了常见高导耐热铜材料的设计思路、制备方法、微观组织结构、力学性能和物理性能,... 详细信息

高导耐热铜基材料作为现代高新技术用关键材料之一,已被广泛应用于轨道交通、电子通信和航空航天等领域。本文从铜合金和铜基复合材料两大领域入手,介绍了常见高导耐热铜材料的设计思路、制备方法、微观组织结构、力学性能和物理性能,并对其导电机制和高温强化机理进行了归纳和阐释,最后对高导耐热铜基材料的研究现状和未来发展进行了总结与展望。

关键词：高电导率高耐热性铜合金铜基复合材料导电机制高温强化机理

Combined Effects of Pre-deformation and Preaging on the Mechanical Properties of Al-Cu-Mg Alloy with Sc and Zr Addition

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Journal of Wuhan University of Technology(Materials Science) 2018年第3期33卷 680-687页

作者：郭宇航 zhao naiqin SHI Chunsheng he chunnian LI Jiajun 刘恩佐 Key Laboratory of Composite and Functional Materials School of Materials Science and Engineering Tianjin University Collaborative Innovation Center of Chemical Science and Engineering Tianjin University

The combined effects of pre-deformation and pre-aging on the mechanical properties of AlCu-Mg alloy with Sc and Zr addition were investigated. It is revealed that the introduction of pre-deformation can enhance the peak-aging strength, as well as tensile and yield strength, effectively due to the formation of finer and more dispersive precipitation. Pre-aging process before pre-deformation can increase the elongation while maintaining higher strength with a discontinuous distribution of precipitates at grain boundary. The precipitates of bean-like Al3（Sc, Zr） particles further strengthen the alloy via pinning the dislocations which are formed during pre-deformation process and hindering the dislocation motion. Furthermore, pre-deformation and pre-aging accelerate the kinetics of precipitation due to preferential sites provided by the dislocation and the increase of GPB zones＇ size and distribution. The synergism of pre-deformation and pre-aging achieves a combination of better mechanical properties and shorter peak-aging time.

关键词： pre-deformation pre-aging mechanical properties Al-Cu-Mg-Sc-Zr alloy