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Acta Metallurgica Sinica(English Letters) 2022年第3期35卷 397-410页

作者： Shuaishuai Wei Bo Song Yuanjie Zhang Lei Zhang Yusheng Shi State key laboratory of Materials Processing and die&mould technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

It is of significance but remains a pivotal challenge to simultaneously enhance the strength and lightweight levels of porous *** provide an innovative strategy to improve the strength of porous structures with unchanged lightweight levels by applied composite *** laser melting(SLM)is convenient for integral forming of materials and ***,in this study,the research about the mechanical response of triply periodic minimal surfaces(TPMS)porous structures with 316 L and composites fabricated by SLM was *** compression test and finite element method(FEM)were used to characterize mechanical *** composite structures exhibit enhanced elastic modulus,yield strength,unvaried lightweight level and refined grain microstructure,which are difficult to realize for porous structures made by pure 316 L *** elastic modulus,yield strength,plateau stress and energy absorption of composites were 3187.50,67.73,15.24 and 17.09 MJ/m^(3),respectively.

关键词： Triply periodic minimal surfaces Mechanical property Fe-based amorphous alloy High specific strength

Microstructure evolution,mechanical properties and fracture behavior of Al-xSi/AZ91D bimetallic composites prepared by a compound casting

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Journal of Magnesium and Alloys 2024年第5期12卷 1944-1964页

作者： Guangyu Li Wenming Jiang Feng Guan Junwen Zhu Yang Yu Zitian Fan State key laboratory of Materials Processing and die&mould technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

In this paper,the effect of the Si content on microstructure evolution,mechanical properties,and fracture behavior of the Al-xSi/AZ91D bimetallic composites prepared by compound casting was investigated *** obtained results showed that all the Al-xSi/AZ91D bimetallic composites had a metallurgical reaction layer(MRL),whose thickness increased with increasing Si content for the hypoeutectic Al-Si/AZ91D composites,while the hypereutectic Al-Si/AZ91D composites were *** MRL included eutectic layer(E layer),intermetallic compound layer(IMC layer)and transition region layer(T layer).In the IMC layer,the hypereutectic Al-Si/AZ91D composites contained some Si solid solution and flocculent Mg_(2)Si+Al-Mg IMCs phases not presented in the hypoeutectic Al-Si/AZ91D ***,increasing Si content,the thickness proportion of the T layer increased,forming an inconsistent preferred orientation of the *** shear strengths of the Al-xSi/AZ91D bimetallic composites enhanced with increasing Si content,and the Al-15Si/AZ91D composite obtained a maximum shear strength of 58.6 MPa,which was 73.4% higher than the Al-6Si/AZ91D *** fractures of the Al-xSi/AZ91D bimetallic composites transformed from the T layer into the E layer with the increase of the Si *** improvement of the shear strength of the Al-xSi/AZ91D bimetallic composites was attributed to the synergistic action of the Mg_(2)Si particle reinforcement,the reduction of oxidizing inclusions and the ratio of Al-Mg IMCs as well as the orientation change of the MRL.

关键词： Al/Mg bimetallic composites Si content Mg_(2)Si reinforcement Microstructure Mechanical properties Fracture behavior

Enthalpy induced phase partition toward hierarchical,nanostructured high-entropy alloys

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Nano Research 2022年第6期15卷 4893-4901页

作者： Rong Guo Lanlan Yu Zhenyu Liu Jie Pan Yonggang Yao Lin Liu State key laboratory of Materials Processing and die&mould technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Heterogeneous nanostructured metals are emerging strategies for achieving both high strength and ductility,which are particularly attractive for high entropy alloys(HEAs)to combine the synergistic enhancements from multielement composition,grain boundaries,and heterogeneity ***,the construction of heterogeneous nanostructured HEAs remains elusive and can involve delicate processes that are not practically *** we report using composition design(i.e.,enthalpy engineering)to create hierarchical,nanostructured HEAs as demonstrated by adding Ni into FeCrCoAlTi_(0.5)*** strong enthalpic interaction between(Ni,Co)and(Al,Ti)pairs in FeCrCoAlTi_(0.5)Nix(x=0.5–1.5)induced phase partitions into B2(ordered phase,hard)matrix and A2(disordered phase,soft)precipitates,resulting in a hierarchical structure of B2 grains and sub-grains of near-coherent A2 nanodomains(~12.5 nm)divided by A2 interdendritic *** a result,the FeCrCoAlTi_(0.5)Ni_(0.5)HEA with this unique hierarchical nanostructure exhibits the best combination of strength and plasticity,i.e.,a 2-fold increase in compressive strength(2.60 GPa)and significant enhancement of plastic strain(15.8%)as compared with the original FeCrCoAlTi_(0.5)*** analysis and simulation study reveal the phase partition process during cooling induced by an enthalpy-driven order-disorder transition while the order parameters illustrate the strong ordering in(Ni,Co)(Al,Ti)-rich B2 phase and high entropy mixing in less interactive FeCrCo-rich A2 *** work therefore provides a strategy for hierarchical nanostructured HEA formation by composition design considering enthalpy and entropy interplay.

关键词： nanocrystalline high-entropy alloys enthalpy hierarchical structures coherent precipitates

Geometry dependent photoconductivity of In2S3 kinks synthesized by kinetically controlled thermal deposition

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Nano Research 2016年第12期9卷 3848-3857页

作者： Xing Xiong QiZhang Lin Gan Xing Zhou Xiaonan Xing Huiqiao Li Tianyou Zhai State key laboratory of Material Processing and die & mould technology School of Materials Science and Engineering Huazhong University of Science and Technology (HUST) Wuhan 430074 China

High quality In2S3 kinks were synthesized via a kinetically controlled thermal deposition process and their optoelectronic characteristics were systematically explored. The growth mechanism was attributed to the combination of kinetic dynamic, crystal fadal energy, and surface roughness. Two trap induced emission bands were evidenced via a low temperature cathodoluminescence （CL） study. Furthermore, the nanowire junctions demonstrated a degenerative photodetection performance, as compared to the straight arms, attributed to a stress-induced extra series resistance measured from the kinked area. The well-controllable shape of the inorganic nanostructures and the detailed exploration of their optoelectronic properties are particularly valuable for their further practical applications.

关键词： geometry dependence photodetection In2S3 kinks thermal deposition

Fullerenes and derivatives as electrocatalysts: Promises and challenges

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Green Energy & Environment 2024年第1期9卷 7-27页

作者： Kun Guo Ning Li Lipiao Bao Xing Lu State key laboratory of Materials Processing and die&mould technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China

Carbon-based metal-free nanomaterials are promising alternatives to precious metals as electrocatalysts of key energy storage and conversion *** paramount signiﬁcance are the establishment of design principles by understanding the catalytic mechanisms and identifying the active *** from sp2-conjugated graphene and carbon nanotube,fullerene possesses unique characteristics that are growingly being discovered and exploited by the electrocatalysis *** instance,the well-deﬁned atomic and molecular structures,the good electron afﬁnity to tune the electronic structures of other substances,the intermolecular self-assembly into superlattices,and the on-demand chemical modiﬁcation have endowed fullerene with incomparable advantages as electrocatalysts that are otherwise not applicable to other carbon *** increasing studies are being reported on this intriguing topic,it is necessary to provide a state-of-the-art overview of the recent *** review takes such an initiative by summarizing the promises and challenges in the electrocatalytic applications of fullerene and its *** content is structured according to the composition and structure of fullerene,including intact fullerene(e.g.,fullerene composite and superlattices)and fullerene derivatives(e.g.,doped,endohedral,and disintegrated fullerene).The synthesis,characterization,catalytic mechanisms,and deﬁciencies of these fullerene-based materials are explicitly *** conclude it by sharing our perspectives on the key aspects that future efforts shall consider.

关键词： Fullerene Fullerene derivative Metal-free catalyst Structural defect Electrocatalyst

Effects of mechanical vibration on filling and solidification behavior, microstructure and performance of Al/Mg bimetal by lost foam compound casting

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China Foundry 2023年第6期20卷 469-479页

作者： Guang-yu Li Feng Guan Wen-ming Jiang Yuan-cai Xu Zheng Zhang Zi-tian Fan State key laboratory of Materials Processing and die&mould technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Al/Mg bimetal was prepared by lost foam solid-liquid compound casting,and the effects of mechanical vibration on the filling and solidification behavior,microstructure and performance of the bimetal were *** show that the mechanical vibration has a remarkable influence on the filling and solidification *** is found that after mechanical vibration,the filling rate increases and the filling rate at different times is more uniform than that without *** addition,the mechanical vibration also increases the wettability between liquid AZ91D and A356 *** mechanical vibration reduces the horizontal and vertical temperature gradient of the casting and makes the temperature distribution of the whole casting more *** to the Al/Mg bimetal without vibration,the shear strength is improved by 39.76%after the mechanical vibration is applied,due to the decrease of the inclusions and Al_(12)Mg_(17) dendrites,and the refinement and uniform distribution of the Mg_(2)Si particles in the interface of the Al/Mg bimetal.

关键词： lost foam casting filling and solidification processes Al/Mg bimetal mechanical vibration microstructure mechanical properties

Review of resistive switching mechanisms for memristive neuromorphic devices

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Chinese Physics B 2020年第9期29卷 1-14页

作者： Rui Yang State key laboratory of Material Processing and die&mould technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Memristive devices have attracted intensive attention in developing hardware neuromorphic computing systems with high energy efficiency due to their simple structure,low power consumption,and rich switching dynamics resembling biological synapses and neurons in the last *** demonstrations have been achieved in memristive synapses neurons and neural networks in the last few *** dynamics are involved in the data processing and storage in biological neurons and synapses,which ask for carefully tuning the switching dynamics of the memristive *** that switching dynamics of the memristive devices are closely related to switching ***,from the perspective of switching dynamics modulations,the mainstream switching mechanisms including redox reaction with ion migration and electronic effect have been systemically *** approaches to tune the switching dynamics in the devices with different mechanisms have been ***,some other mechanisms involved in neuromorphic computing are briefly introduced.

关键词： memristive devices resistive switching mechanisms neuromorphic computing

An Approach to Collaborative Design Based on Distributed Constraint-Net

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Wuhan University Journal of Natural Sciences 2002年第1期7卷 82-86页

作者： He De-lin Wang Geng-yun Li Zhi-gang State key laboratory of die and mould Huazhong University of Science and Technology Wuhan Hubei China

We focuse on design process in concurrent engineering and propose an, approach to collaborative design based on distributed constraint-net. The approach adopts agent technology to express kinds of distributed constraints. And through the cooperation among agents, the consistency of constraint is maintained and the constraint conflict is detected and eliminated. The constraints are satisfied concurrently and distributively. Based on the proposed approach, the collaborative design process in concurrent engineering can be well supported.

关键词： design process collaborative design distributed constraint-net agent concurrent engineering

New method of improving parts accuracy by adding heat balance support in selective laser sintering

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第3期10卷 361-369页

作者： Bing LIU Li-chao ZHANG Jian-hua MO Bo QIAN State key laboratory of Plastic Forming Simulation and die and mould technology School of Material Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China

In order to improve parts accuracy, a method of adding heat balance support （HBS） was proposed, and the detailed algorithm for generating HBS was developed. A number of experiments and a comparison between similar softwares, showed that the algorithm is efficient and feasible. Moreover, different features of riBS were studied for different kinds of materials, such as PS and nylon. The research findings indicate that automatically adding HBS can significantly improve the accuracy of the parts, and that the algorithm for generating HBS is efficient and precise.

关键词： Selective laser sintering (SLS) Accuracy Heat balance support (HBS) Triangular facet 3D rings

In-situ TEM Study on Microstructural Evolution of Nanostructured TiO_2

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Journal of Wuhan University of technology(Materials Science) 2007年第2期22卷 209-213页

作者：邵艳群唐电 State key laboratory of die&mould technology Huazhong University of Science and Technology Institute for Materials Research Fuzhou University

The effect of electron beam on the microstructures and phase transformation of nanostructured TiO2 heat treated at various temperatures for different time was studied by in-situ TEM and SAED. Anatase ex-situ heated at 250℃ and 360℃ transformed to rutile while irradiated by the electron beam. With the increasing sizes and distribution of the powders on the amorphous carbon, the process of phase transformation by the electron beam was encumbered. These evolutions may be due to the changes of vacuum atmosphere and the properties of powders.

关键词： electron beam sol-gel technique TiO2 phase transformation microstructure