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Mechanical behaviors and energy absorption properties of Y/Cr and Ce/Cr coated open-cell nickel-based alloy foams

Rare Metals 2018年第8期37卷 650-661页

作者： Zhi-Li Hu Qiu Pang Guo-Qiang Ji gao-hui wu State Key Laboratory of Advanced Welding and Joining HarbinInstitute of TechnologyHarbin 150001China Hubei Key Laboratory of Advanced Technology of Automobile Components Wuhan University of TechnologyWuhan 430070China School of Mechanical and Electrical Engineering Wuhan Donghu UniversityWuhan 430212China Materials Test Department China National Analytical CenterGuangzhou 510070China

In this study, Y-and Ce-modified Cr coatings applied by pack cementation method were prepared on the surface of open-cell nickel-based alloy foam. The morphologies and microstructures of Y- and Ce-modified Cr coatings with various Y and Ce contents were investigated in detail. Then, the effects of Y and Ce addition on the mechanical properties of open-cell nickel-based alloy foams were analyzed and compared. Simultaneously, the energy absorption capacity and energy absorption efficiency of the Y- and Ce-modified Cr coated alloy foams were discussed and compared at the room and high temperatures. The results show that Cr coatings containing minor amounts of rare earth element （Y and Ce） are well adhered to the nickel-based foam struts. Especially, the microstructure of the 2 wt% Ce-modified Cr coating is denser and uniform. In addition, the compressive strength and plateau stress of Y- and Ce-modified Cr coated alloy foams firstly increase and then decrease by increasing the Y and Ce contents at room and high temperatures. The energy absorption capacity of Y/Cr and Ce/Cr coated alloy foams increases linearly with the strains increasing. The Ce/Cr coated alloy foams can absorb more energy than Y/Cr coated alloy foams in the plateau and densification regions at room temperature. Compared to those at room temperature, the Y- and Ce-modified Cr coated alloy foams show higher energy absorption efficiency when deforma- tion within 10%-30% at high temperature.

关键词： Open-cell nickel-based alloy foam Y-modified Cr coating Ce-modified Cr coating Pack cementation Mechanical properties

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Mechanical Property of M40J_f/5A06Al Composite at Elevated Temperatures

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Acta Metallurgica Sinica(English Letters) 2015年第9期28卷 1175-1182页

作者： Da-Guang Li Guo-Qin Chen Long-Tao Jiang Xiu Lin gao-hui wu School of Materials Science and Engineering Harbin Institute of Technology State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Heilongjiang Academy of Industrial Technology

In this work, aluminum alloy with a high concentration of magnesium （5A06） was reinforced with 55 vol% unidirectional ultra-high modulus and highly graphitized carbon fiber （M40J） using pressure infiltration method. The effect of temperature on the bending strength of the Cf/A1 composites was investigated from room temperature to 500 ℃. The experimental results showed that the strength of M40Jf/5A06A1 composites was not affected by temperature from room temperature to 200 ℃. The bending strength of the composite at 300 ℃ was decreased by 30% compared with that at room temperature. In order to evaluate the extent of interface weakening, the length of fiber pullout was measured. The results showed that the pullout length reached the maximum at 300 and 500 ℃, which indicated weak interface at the corre- sponding temperature. The DSC curve presented obvious heat absorption peak at around 300 ℃, which may be attributed to the dissolution of the interfacial product （A13Mg2） phases at the C/A1 interface. The bending fracture surfaces of the composites after three-point bending tests were observed by SEM, plastic-viscous flow of the matrix were observed at the samples tested at 500 ℃. The predominant mechanisms for high-temperature damage of M40Jf/5A06A1 composites are matrix softening caused by dislocation recovery and interface weakening caused by the dissolution of interfacial products.

关键词： Carbon fiber Aluminum Metal matrix composites High-temperature properties Fiberpullout length

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Electrical Discharge Machining of Al2024-65 vol%SiC Composites

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Acta Metallurgica Sinica(English Letters) 2017年第5期30卷 447-455页

作者： Wen-Shu Yang Guo-Qin Chen Ping wu Murid Hussain Jia-Bing Song Rong-Hua Dong gao-hui wu Department of Materials Science and Engineering HarbinInstitute of TechnologyHarbin 150001China Northwest Institute of Nuclear Technology Xi'an 710024China Department of Chemical Engineering COMSATS Instituteof Information TechnologyM.A.Jinnah BuildingDefenceRoadOff Raiwind RoadLahore 54000Pakistan Beijing Institute of Aerospace Control Devices Beijing 100039China

In the present work, the wire electrical discharge machining（WEDM） process of the 65 vol% SiCp/2024 Al composite prepared by pressure infiltration methods has been investigated. The microstructure of the machined composite was characterized by scanning electron microscope, the average surface roughness（Ra）, X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy（TEM） techniques. Three zones from the surface to the interior（melting zone, heat affected zone and un-affected zone） were found in the machined composites, while the face of SiC particles on the surface toward the outside was ‘‘cut＇＇ to be flat. Increase in Al and Si but decrease in C and O were observed in the core areas of the removed particles. Si phase, which was generated due to the decomposition of SiC, was detected after the WEDM process. The irregular and spherical particles were further observed by TEM. Based on the microstructure observation, it is suggested that the machining mechanism of 65 vol% SiCp/2024 Al composite was the combination of the melting of Al matrix and the decomposition of SiC particles.

关键词： Metal matrix composites SiCp/Al composite Metal infiltration Wire electrical discharge machining(WEDM) SiC decomposition Machining mechanism

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Microstructural evolution and thermal conductivity of diamond/Al composites during thermal cycling

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International Journal of Minerals,Metallurgy and Materials 2021年第11期28卷 1821-1827页

作者： Ping-ping Wang Guo-qin Chen Wen-jun Li hui Li Bo-yu Ju Murid Hussain Wen-shu Yang gao-hui wu School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Qiqihar Xiangke New Material Co. Ltd.Qiqihar 161005China Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology School of Material Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Beijing Institute of Spacecraft System Engineering Beijing 100094China Department of Chemical Engineering COMSATS University IslamabadLahore CampusDefence RoadOff Raiwind RoadLahore 54000Pakistan

The microstructural evolution and performance of diamond/Al composites during thermal cycling has rarely been *** the present work,the thermal stability of diamond/Al composites during thermal cycling for up to 200 cycles was ***,the thermal conductivity(λ)of the composites was measured and scanning electron microscopy of specific areas in the same samples was carried out to achieve quasi-in situ *** interface between the(100)plane of diamond and the Al matrix was well bonded with a zigzag morphology and abundant needle-like Al4C3 *** contrast,the interface between the(111)plane of diamond and the Al matrix showed weak bonding and debonded during thermal *** debonding length increased rapidly over the first 100 thermal cycles and then increased slowly in the following 100 ***λof the diamond/Al composites decreased abruptly over the initial 20 cycles,increased afterward,and then decreased monotonously once more with increasing number of thermal *** in theλof the Al matrix and the corresponding stress concentration at the diamond/Al interface caused by thermal mismatch,rather than interfacial debonding,may be the main factors influencing the decrease inλof the diamond/Al composites,especially in the initial stages of thermal cycling.

关键词： metal-matrix composites diamond stability thermal mismatch stress

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Research progress on the characterization and repair of graphene defects

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International Journal of Minerals,Metallurgy and Materials 2020年第9期27卷 1179-1190页

作者： Bo-yu Ju Wen-shu Yang Qiang Zhang Murid Hussain Zi-yang Xiu Jing Qiao gao-hui wu School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China Department of Chemical Engineering COMSATS University IslamabadLahore CampusDefence RoadOff Raiwind RoadLahore 54000Pakistan State Key Laboratory of Advanced Welding and Jointing Harbin Institute of TechnologyHarbin 150001China

Graphene has excellent theoretical properties and a wide range of applications in metal-based composites. However, because of defects on the graphene surface, the actual performance of the material is far below theoretical expectations. In addition, graphene containing defects could easily react with a matrix alloy, such as Al, to generate brittle and hydrolyzed phases that could further reduce the performance of the resulting composite. Therefore, defect repair is an important area of graphene research. The repair methods reported in the present paper include chemical vapor deposition, doping, liquid-phase repair, external energy graphitization, and alloying. Detailed analyses and comparisons of these methods are carried out, and the characterization methods of graphene are introduced. The mechanism, research value, and future outlook of graphene repair are also discussed at length. Graphene defect repair mainly relies on the spontaneous movement of C atoms or heteroatoms to the pore defects under the condition of applied energy. The repair degree and mechanism of graphene repair are also different according to different preparations. The current research on graphene defect repair is still in its infancy, and it is believed that the problem of defect evolution will be explained in more depth in the future.

关键词： graphene metal matrix composites defect repair characterization repair mechanism

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Deformation treatment and microstructure of graphene-reinforced metal matrix nanocomposites: A review of graphene post-dispersion

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International Journal of Minerals,Metallurgy and Materials 2020年第7期27卷 888-899页

作者： Yong Mei Pu-zhen Shao Ming Sun Guo-qin Chen Murid Hussain Feng-lei Huang Qiang Zhang Xiao-sa gao Yin-yin Pei Su-juan Zhong gao-hui wu State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Institute of Defense Engineering AMSPLABeijing 100036China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Department of Chemical Engineering COMSATS University IslamabadLahore CampusLahore 54000Pakistan State Key Laboratory of Advanced Brazing Filler Materials&Technology Zhengzhou Research Institute of Mechanical Engineering Co.Ltd.Zhengzhou 450001China

Graphene/aluminum(Gr/Al)composites have attracted the attention of researchers all over the world due to their excellent ***,graphene agglomerates easily because of the van der Waals force between graphite sheets,thereby affecting the performance of the *** the agglomeration of graphene and dispersing it uniformly in the Al matrix is a key *** the preparation process,predispersion treatment and deformation treatment can play important roles in graphene *** have conducted a series of research and literature reviews of the graphene predispersion and consolidation of ***,they paid less attention to post-deformation *** review summarizes different deformation treatments involved in the preparation process of Gr/Al composites and the evolution of the microstructure during the *** on deformation parameters is expected to further improve the properties of Gr/Al composites and would provide a deep understanding of the strengthening effect of graphene.

关键词： graphene/aluminum composites deformation treatment dispersion microstructure

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抢占中国农村物流市场新高地

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特区经济 2009年第11期 297-299页

作者：高辉吴旻重庆交通大学管理学院重庆400074

激烈的市场竞争,金融风暴的持续冲击,面对业务量严重下滑的物流企业正在开辟新的市场、寻找新的利润增长点。中国农村物流市场具有巨大的发展前景,谁要是能先行一步抢占这个重要的物流市场新高地,很有可能会在空前激烈的物流市场竞争中... 详细信息

激烈的市场竞争,金融风暴的持续冲击,面对业务量严重下滑的物流企业正在开辟新的市场、寻找新的利润增长点。中国农村物流市场具有巨大的发展前景,谁要是能先行一步抢占这个重要的物流市场新高地,很有可能会在空前激烈的物流市场竞争中大大提升自己的核心竞争力,并获得长远的发展。

关键词：市场新高地机遇农村物流市场

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Damping properties and mechanism of aluminum matrix composites reinforced with glass cenospheres

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Transactions of Nonferrous Metals Society of China 2024年第9期34卷 2743-2755页

作者： Kai SUN Lin WANG Hang SU Jia-yi GENG Qiang ZHANG Bo MENG Zeng-yan WEI gao-hui wu School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials Xi’an 710000China Shandong Quality Inspection and Testing Center of Construction Engineering Shandong Academy of Building Research Co.Ltd.Jinan 250031China

The damping properties were improved by preparing Al matrix composites reinforced with glass cenospheres through the pressure infiltration *** electron microscopy and scanning electron microscopy were employed to characterize the microstructure of the *** low-frequency damping properties were examined by using a dynamic mechanical thermal analyzer,aiming at exploring the changing trend of damping capacity with strain,temperature,and *** findings demonstrated that the damping value rose as temperature and strain increased,with a maximum value of ***,the damping value decreased when the frequency *** damping under strain and interfacial damping under temperature served as the two primary damping *** increase in the density of dislocation strong pinning points following heat treatment reduced the damping value,which was attributed to the heat treatment enhancement of the interfacial bonding force of the composites.

关键词： glass cenospheres Al matrix composites microstructure low-frequency damping properties

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Review of precipitation strengthening in ultrahigh-strength martensitic steel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 256-269页

作者： Zhihao Tian Chunlei Shang Chaolei Zhang Xiaoye Zhou Honghui wu Shuize Wang Guilin wu Junheng gao Jiaming Zhu Xinping Mao Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Institute of Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110004China Department of Materials Science and Engineering Shenzhen MSU-BIT UniversityShenzhen 518172China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China School of Civil Engineering Shandong UniversityJinan 250061China

Martensite is an important microstructure in ultrahigh-strength steels,and enhancing the strength of martensitic steels often involves the introduction of precipitated phases within the martensitic *** considerable research efforts devoted to this area,a systematic summary of these advancements is *** review focuses on the precipitates prevalent in ultrahigh-strength martensitic steel,primarily carbides(e.g.,MC,M_(2)C,and M_(3)C)and intermetallic compounds(e.g.,Ni Al,Ni_(3)X,and Fe_(2)Mo).The precipitation-strengthening effect of these precipitates on ultrahigh-strength martensitic steel is discussed from the aspects of heat treatment processes,microstructure of precipitate-strengthened martensite matrix,and mechanical ***,a perspective on the development of precipitation-strengthened martensitic steel is presented to contribute to the advancement of ultrahigh-strength martensitic *** review highlights significant findings,ongoing challenges,and opportunities in the development of ultrahigh-strength martensitic steel.

关键词： ultrahigh-strength martensitic steel precipitation strengthening mechanical property carbide intermetallic compound

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闪热解对烟煤焦结构及活化过程孔隙生成的影响

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煤炭学报 2016年第11期41卷 2867-2875页

作者：刘冬冬高继慧吴少华秦裕琨哈尔滨工业大学能源科学与工程学院黑龙江哈尔滨150001

采用闪热解方式在不同温度(500,800和1 000℃)和停留时间(10和40 min)条件下制备分级孔活性炭。使用SEM分析煤焦表面形貌,N_2吸附获得孔结构参数、XRD和Raman分别获得芳香层片尺寸和不同杂化炭结构参数。通过活化过程与慢速热解焦结构... 详细信息

采用闪热解方式在不同温度(500,800和1 000℃)和停留时间(10和40 min)条件下制备分级孔活性炭。使用SEM分析煤焦表面形貌,N_2吸附获得孔结构参数、XRD和Raman分别获得芳香层片尺寸和不同杂化炭结构参数。通过活化过程与慢速热解焦结构参数的变化进行对比,探究不同煤焦的碳损失与孔隙形成机制。研究结果表明,闪热解终温是控制中孔生成的主要因素,停留时间影响微晶形态及其空间结构的变化。慢速热解焦(M800-10)烧失率为53.6%时,其比表面积为663.19 m^2/g,微孔孔容为0.246 m^3/g,颗粒表面已被严重刻蚀。闪热解焦(K800-40)烧失率为25.2%时,比表面积为859.14 m^2/g,微孔孔容为0.34 m^3/g,具有明显分级孔结构特征,外部无明显刻蚀。在最佳的闪热解工况下制备前驱体煤焦,可有效消除活化气体和活化产物的内扩散阻力,使颗粒内部和表面同时发生烧失生成大量微孔,有效抑制了颗粒表面烧失并降低活性炭制备成本。

关键词：闪热解煤焦结构分级孔碳损失

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