检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Xu, Feng Zhu, Can Wang, Jian Luo, Feng Zhu, Xinqiang Xu, Jiahui Chen, Shuquan Ma, Guoliang Chen, Fenghua Kuang, Yafei He, Jun Sun, Zhigang School of Materials Science and Engineering Taiyuan University of Science and Technology Taiyuan030024 China State Key Laboratory of Advanced Materials Composite Technology Wuhan University of Technology Wuhan430070 China Central Iron and Steel Research Institute Beijing100081 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing China

Improving elastocaloric effect (eCE) and mechanical properties is the key to developing high-performance eCE cooling materials. In this paper, the metamagnetic shape memory alloys Ni35.5Co13.5Mn35Ti15-x Gdx was successfully prepared by arc melting method, and the effects of Gd substitution for Ti on the martensitic transformation (MT) temperature, phase composition, microstructure, eCE and mechanical properties of the alloys were systematically investigated. With the introduction of Gd elements, transformation temperature shifts to low temperature, and the mechanical properties of the alloy are also enhanced. The maximum compressive strength increased from 980MPa (x=0) to 1142MPa (x=0.9). At room temperature, a large adiabatic temperature change of +13.5/-12.7 K is obtained after loading/unloading, and a constant temperature change of +5.6K/-5.5K is obtained without apparent degradation under the compressive stress of 400 MPa during 61 cycles for Ni36.5Co13.5Mn35Ti14.9Gd0.1 alloy. The underlying mechanism of the enhanced eCE and mechanical properties is also discussed. © 2023, The Authors. All rights reserved.

关键词： Titanium alloys

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A numerical method for predicting bursting strength of composite rocket motor case considering filament winding process-induced stress

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Chinese Journal of Aeronautics 2025年第2期 509-522页

作者： Jiqiu LIANG Fei ZHAO Dan WU Anxin DING Hubei Key Laboratory of Advanced Aerospace Propulsion Technology System Design Institute of Hubei Aerospace Technology Academy School of Materials Science and Engineering Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

A numerical method to predict the bursting strength of filament wound composite rocket motor case is proposed here. This method can evaluate the longitudinal stress evolution of each composite layer as impregnated filaments with fiber tension are wound layer by layer, and consider the effects of accumulated stress and deformation during filament winding on the bursting strength of composite case. Taking ?520 mm composite cases as a case study, the filament-winding-processinduced stress and deformation as well as progressive damage behavior are numerically predicted,followed by a comparison with experimental results. The numerical results show that the predicted bursting pressures for composite cases manufactured on the mandrels with and without a flexible component are 14.20 MPa and 21.40 MPa, respectively. These values exhibit slight deviation from the measured pressures of 13.50 MPa and 21.57 MPa. Moreover, the predicted damage locations,situated respectively in the dome and cylinder, agree well with the experimental observation. These observations indicate that use of flexible component reduces the load-bearing capacity of the ***, it validates the reliability and accuracy of the proposed numerical method in predicting the bursting strength of composite cases.

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Simultaneously healing cracks and strengthening additively manufactured Co_(34)Cr_(32)Ni_(27)Al_(4)Ti_(3) high-entropy alloy by utilizing Fe-based metallic glasses as a glue

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Journal of materials Science & technology 2024年第12期179卷 125-137页

作者： Hao Kang Kaikai Song Leilei Li Xiaoming Liu Yandong Jia Gang Wang Yaocen Wang Si Lan Xin Lin Lai-Chang Zhang Chongde Cao School of Physical Science and Technology Northwestern Polytechnical UniversityXian 710072China School of Mechanical Electrical&Information EngineeringShandong UniversityWeihai 264209China Institute of Materials Shanghai UniversityShanghai 200444China Herbert Gleiter Institute of Nanoscience School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXian 710072China Centre for Advanced Materials and Manufacturing School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWestern Australia 6027Australia Research and Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China

Solidification cracking issues during additive manufacturing(AM)severely prevent the rapid development and broad application of this *** this work,a representative Co_(34)Cr_(32)Ni_(27)Al_(4)Ti_(3) high-entropy al-loy(HEA)susceptible to crack formation was fabricated by selective laser melting(SLM).As expected,many macroscopic cracks *** crack issues were successfully solved after introducing a certain amount of Fe-based metallic glass(MG)powder as a glue during *** effect of MG addition on the formation and distribution of defects in the SLM-processed HEA was quantitatively *** an increasing mass fraction of the MG,the dominant defects transformed from cracks to lack of fusion(LOF)defects and finally ***,the MG preferred to be segregated to the boundaries of the molten ***,the coarse columnar crystals gradually transformed into equiaxed crystals in the molten pool and fine-equiaxed crystals at the edge of the molten pool,inhibiting the initiation of cracks and providing extra grain boundary ***,multiple precipitates are formed at the boundaries of cellular structures,which contribute significantly to *** to the brit-tle SLM-processed Co_(34)Cr_(32)Ni_(27)Al_(4)Ti_(3) HEA,the SLM-processed HEA composite exhibited a high ultimate tensile strength greater than 1.4 Ga and enhanced *** work demonstrates that adding Fe-based MG powders as glues into SLM-processed HEAs may be an attractive method to heal cracks and simultaneously enhance the mechanical properties of additively manufactured products.

关键词： Selective laser melting High-entropy alloys Crack healing Metallic glasses Mechanical properties

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Numerical simulation and experimental study of laminated incremental forming process 9

Numerical simulation and experimental study of laminated inc...

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2024 9th International Conference on Mechanical Structures and Smart materials, ICMSSM 2024

作者： Xinhai, Zhao Xuemei, Liu Zhiyuan, Si Chao, Zheng Yongchao, Tan State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Shandong Jinan250061 China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Shandong Jinan250061 China Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Wollongong2522 Australia Engineer Training Center Shandong University Jinan2500002 China

In order to improve the surface quality of incremental forming parts, this paper is studied. Through numerical simulation, the influence rules of different overlapping materials and overlapping thickness on the forming quality of target parts are obtained, and the optimal forming process parameters are given. Compared with the experimental results, the better forming results were obtained. © Published under licence by IOP Publishing Ltd.

关键词： Digital elevation model

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Recent advances and perspectives of metal/covalent-organic frameworks in metal-air batteries

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Journal of Energy Chemistry 2021年第12期30卷 113-129,I0003页

作者： Ming Zhong Ming Liu Na Li Xian-He Bu School of Materials Science and Engineering Tianjin Key Laboratory of Metal and Molecule-Based Material ChemistryNankai UniversityTianjin 300350China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050GansuChina College of Chemistry Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education)Nankai UniversityTianjin 300071China

Metal-air batteries(MABs)have attracted considerable attention as a novel energy technology that can alleviate the severe energy crisis and environmental *** primary processes,including oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)occur on the air cathode and dominate the battery performance during battery charging and ***,metal-organic frameworks(MOFs)and covalent-organic frameworks(COFs)emerge as promising cathode catalysts due to their structure and composition *** unique characteristics of MOFs and COFs contribute to improved *** review mainly summarizes the recent applications of MOFs and COFs in a series of MABs,mainly including lithium-and zinc-air ***,some critical issues are emphasized regarding MOFs and COFs used in other MABs limited progress,their fabrication and alternatives to potential problems.

关键词： Metal-organic frameworks Covalent-organic frameworks Li-air batteries Zn-air batteries Active sites

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Benzobisthiazole Polymer with Resonance-assisted Hydrogen Bonds for High-performance Transistor and Solar Cell Applications

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Chinese Journal of Polymer Science 2022年第2期40卷 147-156页

作者： Bing-Yong Liu Cong Xie Cong-Wu Ge Meng-Meng Cui Wei Yang Zai-Fei Ma Xi-Ke Gao Yin-Hua Zhou Qing Zhang Shanghai Key Laboratory of Electrical Insulation and Thermal Aging School of Chemistry and Chemical EngineeringShanghai Jiaotong UniversityShanghai 200240China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Center for Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Center for Advanced Low-dimension MaterialsDonghua UniversityShanghai 201620China

Benzobisthiazole polymer with resonance-assisted hydrogen bonds(RAHBs)has been synthesized for both organic field-effect transistor and polymer solar cell *** properties of the hydrogen bonded polymer are compared with the reference polymer without ***-crystal X-ray diffraction analyses of the building block reveal that the RAHB interactions are formed between the carbamate hydrogen and imine nitrogen of the *** hydrogen donor and acceptor are connected byπ-conjugated molecular framework and the hydrogen-bridged quasi aromatic rings lock the conformation of the building *** building block adopted a layered sandwich packing in crystal instead of slipped herringbone stacking which was often found in the crystal of benzobisthiazole *** polymer PCBTZ-TT with RAHBs showed deeper HOMO/LUMO energy level(about 0.2 eV)than reference *** PCBTZ-TT demonstrated the hole mobility of0.96 cm^(2)·V^(-1)·s^(-1) in field-effect transistor devices and achieved power conversion efficiency of 13.6%in solar cell devices with Y6 as acceptor without any additive.

关键词： Resonance-assisted hydrogen bonding Benzobisthiazole Thiazole OFET OPV

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镍基高温合金的连续动态再结晶形核机制和退火孪晶演变与晶粒生长的关系

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Journal of Central South University 2023年第1期30卷 49-60页

作者：汪彦江贾智高泽玺刘德学 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals(Lanzhou University of Technology) Lanzhou 730050China School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China School of Materials Science and Engineering Central South UniversityChangsha 410083China

采用电子背散射衍射(EBSD)和透射电子显微镜(TEM)技术对镍基高温合金热压缩变形行为进行了表征。所研究的高温合金在热压缩变形后的主要组织特征是亚晶粒、动态再结晶(DRX)核、DRX晶粒生长和退火孪晶的发展。考虑到变形晶粒之间的近似... 详细信息

采用电子背散射衍射(EBSD)和透射电子显微镜(TEM)技术对镍基高温合金热压缩变形行为进行了表征。所研究的高温合金在热压缩变形后的主要组织特征是亚晶粒、动态再结晶(DRX)核、DRX晶粒生长和退火孪晶的发展。考虑到变形晶粒之间的近似取向和动态再结晶结果,在低温和高应变率下,除了孪晶辅助再结晶形核外,以亚晶粒结合和旋转为特征的连续动态再结晶(CDRX)形核机制也起着主要作用。MC和γ′析出相在低温(900和1000℃)时促进了DRX的形核,但阻碍了再结晶的生长。高变形温度下的晶粒生长依赖于大角度晶界迁移引起的晶粒相互吞并,这消耗了部分退火孪晶,只有少数退火孪晶在取向偏转后保持稳定。

关键词：镍基高温合金高应变速率连续动态再结晶退火孪晶析出相

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Atomic defects,functional groups and properties in MXenes

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Chinese Chemical Letters 2021年第1期32卷 339-344页

作者： Wenjun Cui Zhi-Yi Hu Raymond RUnocic Gustaaf Van Tendeloo Xiahan Sang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China NRC(Nanostructure Research Centre) Wuhan University of TechnologyWuhan 430070China Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTN 37831United States EMAT(Electron Microscopy for Materials Science) University of AntwerpAntwerpB-2020Belgium

MXenes,a new family of functional two-dimensional(2 D) materials,have shown great potential for an extensive variety of applications within the last *** defects and functional groups in MXenes are known to have a tremendous influence on the functional *** this review,we focus on recent progress in the characterization of atomic defects and functional group chemistry in MXenes,and how to control them to directly influence various properties(e.g.,electron transport,Li^(+) adsorption,hydrogen evolution reaction(HER) activity,and magnetism) of 2 D MXenes *** structural transformations such as oxidation and growth induced by atomic defects in MXenes are also *** review thus provides perspectives on property optimization through atomic defect engineering,and bottom-up synthesis methods based on defect-assisted homoepitaxial growth of MXenes.

关键词： MXenes Atomic defects Surface functional groups Electron microscopy Functional properties

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原位渗硼激光熔覆FeCoCrNiMn涂层的摩擦学性能研究及其在齿轮修复中的应用

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表面工程与再制造 2024年第3期24卷 65-67页

作者： Dongya Zhang[a] Xiaoyu Suo[a] JinYuan Liu[a] Zhongwei Li[a] Yanchao Zhang[a] Hongxing Wu[b] [a]Key Laboratory of Manufacturing Equipment of the Shaanxi Province School of Mechanical and Precision Instrument Engineering Xi’an University of Technology Xi’an PR China [b]State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical University 710072 Xi’an China

高速重载的机械作业中,齿轮易发生点蚀、粘着和磨损,从而导致轮齿断裂和磨损失效。本文通过激光熔覆与渗硼集成的方式对失效齿轮进行修复实验,并对其摩擦学性能和修复后振动特性进行了系统研究。与母材相比,硼化物表面的平均硬度提高了8... 详细信息

高速重载的机械作业中,齿轮易发生点蚀、粘着和磨损,从而导致轮齿断裂和磨损失效。本文通过激光熔覆与渗硼集成的方式对失效齿轮进行修复实验,并对其摩擦学性能和修复后振动特性进行了系统研究。与母材相比,硼化物表面的平均硬度提高了8.37倍,耐磨性提高了15.60倍。

关键词：激光熔覆平均硬度渗硼硼化物机械作业摩擦学性能磨损失效高速重载

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Influences of different Zr/Sc ratios on microstructure and mechanical properties of Al-2Si alloy

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Journal of Rare Earths 2021年第1期39卷 105-112,I0004页

作者： Qinglin Li Xiaodong Ma Binqiang Li Jiqiang Ma Xiangyu Feng Ruijie Pei Jianjun Liu School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

The influences of different Zr/Sc ratios on the microstructural evolution and mechanical performances of Al-2 Si alloy were investigated in this *** as-cast samples were characterized and analyzed by the scanning electron microscope(SEM)with an energy dispersive spectrometer(EDS)to indicate the refining effect of the different Zr/Sc ratios on theα-Al and Si phases in Al-2 Si *** results indicate that theα-Al phases are refined from coarse dendritic structure to relatively fine equiaxed grains when the Zr/Sc ratio is equal to 1:***,the eutectic Si phase in Al-2 Si-0.2 Zr-0.2 Sc alloy is modified from the coarse plate and needle to fine fiber and partial granular structure,and the average roundness of eutectic Si is decreased by 75%from 16 to *** the refinement ofα-Al phases and the modification of eutectic Si structure,the ultimate tensile strength(UTS)is improved by 53%and the elongation(EL)is increased by 64%when the Zr/Sc ratio is equal to 1:*** addition,the UTS decreases and EL is enhanced with the increase of tensile ***,the fracture model of Al-2 Si-0.2 Zr-0.2 Sc alloy in250℃changes into the ductile fracture.

关键词： Al-Si alloy Zr/Sc ratio α-Al phases Eutectic Si Mechanical properties Rare earths

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