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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

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

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

‘Food and medicine continuum’ in the East and West: Old tradition and current regulation

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Chinese herbal Medicines 2023年第1期15卷 6-14页

作者： Ruyu Yao chunnian he Peigen Xiao Institute of Medicinal Plant Development Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100193China

Food-medicine products are important materials for daily health management and are increasingly popular in the global healthy food ***,because of the biocultural difference,food-medicine knowledge may differ among regions,which hinders the global sharing of such health *** at bridging the food-medicine knowledge in the East and West,this study traced the historical roots of food and medicine continuum of the East and West,which was followed by a cross-cultural assessment on the importance of food-medicine products of China,thereafter,the current legislative terms for foodmedicine products were studied using an international *** results show that the food and medicine continuum in the East and West have their historical roots in the traditional medicines since antiquity,and the food-medicine knowledge in the East and West differs substantially;although the foodmedicine products have common properties,their legislative terms are diverse globally;with proofs of traditional uses and scientific evidence,food-medicine products are possible for cross-cultural ***,we recommend facilitating the cross-cultural communication of the food-medicine knowledge in the East and West,thus to make the best use of the traditional health wisdom in the globe.

关键词： cross-cultural communication food and medicine continuum food-medicine products regulation tradition

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

Sabatier principle guiding the design of cathode catalysts for Li-CO_(2) batteries

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Journal of Energy Chemistry 2024年第10期97卷 585-592,I0012页

作者： Haonan Xie Yimin Zhang Biao Chen chunnian he Chunsheng Shi Enzuo Liu Naiqin Zhao School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsKey Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education)Tianjin UniversityTianjin 300350China National Industry-Education Platform of Energy Storage Tianjin UniversityTianjin 300350China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207FujianChina

The Sabatier principle has been widely used for designing electrocatalysts for energy conversion applications,but it is rarely mentioned in the research of cathode catalyst of Li-CO_(2) *** our work,the"volcanic"relationship between the catalytic activity and the adsorption energy of the catalyst to the intermediates is first demonstrated based on the first-principles calculation,which meets the Sabatier principle and can be used to design the cathode *** increases in the number of nitrogenvacancy in WN shift the d-band center and increase the interaction with the *** catalytic activity increases first and then decreases with the increase of adsorption energy,which was proved in the *** optimal catalyst for moderate adsorption of intermediate makes the thin LiaCO_(3) distribute *** exhibits a median voltage difference of 0.68 V and an energy efficiency of 84.33%at20μA cm^(-2)with a limited capacity of 200μA h cm^(-2).

关键词： Sabatier principle Bidirectional catalyst Transition metal nitrides Nitrogen-vacancy Li-CO_(2) batteries

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