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Multi-layer multi-pass friction rolling additive manufacturing of Al alloy:Toward complex large-scale high-performance components

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 425-438页

作者： Haibin Liu Run Hou Chenghao Wu Ruishan Xie Shujun Chen College of Mechanical&Energy engineering Beijing University of TechnologyBeijing 100124China chongqing research Institute of Beijing University of technology Chongqing 401121China

At present,the emerging solid-phase friction-based additive manufacturing technology,including friction rolling additive man-ufacturing(FRAM),can only manufacture simple single-pass *** this study,multi-layer multi-pass FRAM-deposited alumin-um alloy samples were successfully prepared using a non-shoulder tool *** material flow behavior and microstructure of the over-lapped zone between adjacent layers and passes during multi-layer multi-pass FRAM deposition were studied using the hybrid 6061 and 5052 aluminum *** results showed that a mechanical interlocking structure was formed between the adjacent layers and the adja-cent passes in the overlapped center *** friction and rolling of the tool head led to different degrees of lateral flow and plastic deformation of the materials in the overlapped zone,which made the recrystallization degree in the left and right edge zones of the over-lapped zone the highest,followed by the overlapped center zone and the non-overlapped *** tensile strength of the overlapped zone exceeded 90%of that of the single-pass deposition *** is proved that although there are uneven grooves on the surface of the over-lapping area during multi-layer and multi-pass deposition,they can be filled by the flow of materials during the deposition of the next lay-er,thus ensuring the dense microstructure and excellent mechanical properties of the overlapping *** multi-layer multi-pass FRAM deposition overcomes the limitation of deposition width and lays the foundation for the future deposition of large-scale high-performance components.

关键词： aluminum alloy additive manufacturing solid-state friction stir welding multi-layer multi-pass

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High-temperature-tolerant flexible supercapacitors: Gel polymer electrolytes and electrode materials

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Journal of Energy Chemistry 2025年第1期100卷 426-457页

作者： Chong Peng Xinyi Huang Mingwei Zhao Shuling Liao Quanhong Yang Nianjun Yang Siyu Yu School of Chemistry & Chemical engineering Southwest University Nanoyang Group Tianjin Key Laboratory of Advanced Carbon and Electrochemical Energy Storage School of Chemical Engineering and Technology and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin University Department of Chemistry & IMO-IMOMEC Hasselt University

The development of flexible supercapacitors(FSCs) capable of operating at high temperatures is crucial for expanding the application areas and operating conditions of supercapacitors. Gel polymer electrolytes and electrode materials stand as two key components that significantly impact the efficacy of hightemperature-tolerant FSCs(HT-FSCs). They should not only exhibit high electrochemical performance and excellent flexibility, but also withstand intense thermal stress. Considerable efforts have been devoted to enhancing their thermal stability while maintaining high electrochemical and mechanical performance. In this review, the fundamentals of HT-FSCs are outlined. A comprehensive overview of state-of-the-art progress and achievements in HT-FSCs, with a focus on thermally stable gel polymer electrolytes and electrode materials is provided. Finally, challenges and future perspectives regarding HT-FSCs are discussed, alongside strategies for elevating operational temperatures and *** review offers both theoretical foundations and practical guidelines for designing and manufacturing HT-FSCs, further promoting their widespread adoption across diverse fields.

关键词： Flexible supercapacitors High-temperature tolerance Gel polymer electrolytes Electrode materials

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Corrosion Behavior of 5A05 Aluminum Alloy in NaCl Solution

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Acta Metallurgica Sinica(English Letters) 2013年第5期26卷 581-587页

作者： Bin WANG Lunwu ZHANG Yan SU Yong XIAO Jie LIU Southwest technology and engineering research Institute Chongqing Engineering Research Center for Environmental Corrosion and Protection

The corrosion behavior of 5A05 aluminum alloy in 3.5 wt.% NaCl solution was investigated by scanning electron microscopy（SEM）, X-ray photoelectron spectroscopy（XPS）, Fourier transform-infrared（FT-IR） spectroscopy and electrochemical impedance spectroscopy（EIS） test, and the corrosion mechanism was also discussed. The results showed that the corrosion rates of the 5A05 alloy were low and decreased with the increase in immersion time. Under the conditions of exposure studied, this alloy sufered from pitting corrosion that took place from or around the intermetallic particles existing in the alloy. The number and size of the hemispherical corrosion pits on the sample surfaces increased with the increase of the test time. The dark-grey layer of corrosion products formed on 5A05 aluminum alloy in 3.5% NaCl solution contained many microcracks. Furthermore, XPS and FT-IR analysis proved that the corrosion products were mainly composed of Al2 O3, Al（OH）3 and AlCl3.

关键词： Aluminum alloy Pitting corrosion Intermetallics Electrochemical impedance spectroscopy X-ray photoelectron spectroscopy

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Effects of yttrium addition on microstructure and mechanical properties of as-extruded AZ31 magnesium alloys

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中国有色金属学会会刊：英文版 2008年第A01期18卷 1-6页

作者：潘复生陈美宝王敬丰彭建汤爱涛 National engineering research center for Magnesium Alloys Chongqing University School of Safety engineering Chongqing University of Science and Technology

The effects of yttrium addition on microstructure and mechanical properties of as-extruded AZ31 magnesium alloys were investigated by OM,XRD and *** results show that the addition of yttrium results in the formation of a new phase,Al_2Y. When the addition of yttrium is higher than 1.48%-2.91%(mass fraction),another new phase,Al_3Y_5Mn_7,forms,and the amount ofβ-Mg_(17)Al_(12) phase in the AZ31 alloy decreases *** tensile test at room temperature indicates that the yield strength of as-extruded AZ31 alloys improves with the addition of yttrium,but the elongation decreases,which is possibly related to the formation of coarse blocky compounds containing yttrium and the grain coarsening in the alloys.

关键词：镁合金稀有金属微观结构调查研究

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Mechanical properties and energy absorption of extruded Mg–2.0Zn–0.3Zr alloy with Y addition

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Rare Metals 2015年第5期34卷 314-323页

作者： Bin-Jiang Lv Jian Peng Yi Peng Ai-Tao Tang Fu-Sheng Pan College of Materials Science and engineering Chongqing University chongqing Advanced Materials research center Chongqing Academy of Science and Technology

The effects of the rare earth element Y addition on mechanical properties and energy absorption of a low Zn content Mg-Zn-Zr system alloy and the deformation temperature of optimized alloy were investigated by room tensile test, optical microscopy （OM）, X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and transmission electron microscope （TEM）. The results show that, after homogenization at 420℃ for 12 h for the as-cast alloys, MgZn phase forms, which decreases the strength of Mg-2.0Zn-0.3Zr alloy with Y content of 0.9 wt%. The tensile strength and elongation of the alloy with a Y addition of 5.8 wt% reach the max value （281 ±2） MPa and （30.1 ± 0.7） %, respectively; the strength and elongation of Mg-2.0Zn-0.3Zr-0.9Y alloy at the optimized extrusion temperature of 330 ℃ reach （321 ± 1） MPa and （21.9 ± 0.7） %, respectively. The energy absorption increases with the increase of Y content, the max value reached 0.79 MJ·m^-3 with Y content of 5.8 wt%, and the energy absorption of Mg-2.0Zn-0.3Zr-0.9Y alloy at the optimized extrusion temperature of 330 ℃ reaches 0.75 MJ·m^-3.

关键词： Yttrium Microstructure Mechanical properties Energy absorption

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Effects of calcium addition on as-cast microstructure and mechanical properties of Mg-5Zn-5Sn alloy

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Transactions of Nonferrous Metals Society of China 2010年第5期20卷 769-775页

作者：杨明波程亮潘复生 Materials Science and engineering College Chongqing University of Technology National engineering research center for Magnesium Alloys Chongqing University

The effects of Ca addition on the as-cast microstructure and mechanical properties of the Mg-5Zn-5Sn (mass fraction,%) alloy were *** results indicate that an addition of 0.5%-1.5% (mass fraction) Ca to the Mg-5Zn-5Sn alloy not only refines the as-cast microstructure of the alloy but also causes the formation of the primary and/or eutectic CaMgSn phases with high thermal stability;an increase in Ca amount from 0.5% to 1.5% (mass fraction) increases the amount and size of the CaMgSn *** addition,Ca addition to the Mg-5Zn-5Sn alloy improves not only the tensile properties at room temperature and 150 ℃ but also the creep *** the Ca-containing Mg-5Zn-5Sn alloys,the one added 0.5% (mass fraction) Ca obtains the optimum ultimate tensile strength and elongation at room temperature and 150 ℃,however,the alloy added 1.5% (mass fraction) Ca exhibits the optimum yield strength and creep properties.

关键词： magnesium alloy Mg-5Zn-5Sn alloy microstructure and properties Ca addition

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Comparison of as-cast microstructure,tensile and creep properties for Mg-3Sn-1Ca and Mg-3Sn-2Ca magnesium alloys

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Transactions of Nonferrous Metals Society of China 2010年第4期20卷 584-589页

作者：杨明波程亮潘复生 Materials Science and engineering College Chongqing University of Technology National engineering research center for Magnesium Alloys Chongqing University

The as-cast microstructure,tensile and creep properties of Mg-3Sn-1Ca and Mg-3Sn-2Ca magnesium alloys were investigated and compared by using optical microscopy and scanning electron microscopy,X-ray diffraction analysis and tensile tests. The results indicate that the as-cast microstructures of Mg-3Sn-1Ca and Mg-3Sn-2Ca alloys are *** former is mainly composed ofα-Mg,eutectic CaMgSn and solid state precipitation of Mg 2 Sn,whereas the latter is mainly composed ofα-Mg, primary CaMgSn,eutectic CaMgSn and Mg2Ca *** a result,the two alloys obtain different tensile and creep properties. Mg-3Sn-1Ca alloy shows relatively higher ultimate tensile strength and elongation at room temperature and 150℃than Mg-3Sn-2Ca alloy,however,the yield strengths of Mg-3Sn-1Ca alloy at room temperature and 150℃are relatively *** addition,the creep properties of Mg-3Sn-1Ca alloy at 150℃and 70 MPa for 100 h are obviously lower than those of the Mg-3Sn-2Ca alloy.

关键词： magnesium alloy CaMgSn phase Sn Ca mechanical properties

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A High-Ductility Mg–Zn–Ca Magnesium Alloy

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Acta Metallurgica Sinica(English Letters) 2019年第1期32卷 23-30页

作者： Teng Tu Xian-Hua Chen Jiao Chen Chao-Yue Zhao Fu-Sheng Pan College of Materials Science and engineering Chongqing University National engineering research center for Magnesium Alloys Chongqing University chongqing Academy of Science and technology

A new kind of Mg–2 Zn–0.6 Ca(wt%) alloy was fabricated by casting and hot extrusion as a high-ductility structural material. The extruded alloy exhibits a superior elongation of ～30%, yield strength of 130 MPa and ultimate tensile strength of 280 MPa along the extrusion direction at room temperature. Microstructure, texture and tensile properties of the extruded alloy were investigated in details. The remarkable improvement of ductility is ascribed to the weakened basal texture, refined grains and a small number of second phase in the alloy.

关键词： Magnesium alloy Mg–Zn–Ca High ductility Extrusion Texture

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Enhanced Electromagnetic Interference Shielding of Mg–Zn–Zr Alloy by Ce Addition

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Acta Metallurgica Sinica(English Letters) 2015年第4期28卷 492-498页

作者： Xian-Hua Chen Li-Zi Liu Juan Liu Fu-Sheng Pan College of Materials Science and engineering Chongqing University National engineering research center for Magnesium Alloys Chongqing University chongqing Academy of Science and technology

The effects of Ce addition on microstructure and electromagnetic interference （EMI） shielding response of Mg- 6Zn-0.5Zr （ZK60） alloy have been investigated. Ce addition resulted in grain refinement and higher density of Mg-Zn-Ce and MgZn2 intermetallic particles in the alloy. In particular, this was substantially remarkable as the addition of Ce was up to 1.0 wt%. It is interesting to note that as-extruded ZK60 alloy with 1.0 wt% Ce addition exhibited an EMI shielding effectiveness （SE） exceeding 70 dB at the frequency range of 30-1,500 MHz, which was significantly higher than that of ZK60 alloy without Ce addition and reached the requirement of high protection. The superior SE was probably related to the increased reflection and multiple reflection of electromagnetic radiation induced by Ce addition. Direct artificial aging at 150 ℃ for 25 or 50 h led to a further increase of 7-10 dB in the SE of the alloy with 1.0 wt% Ce addition. The advantages of excellent shielding capacity and favorable mechanical strength make the Mg-Zn-Zr-Ce alloy an attractive shielding candidate material for a variety of technological applications.

关键词： Magnesium alloys Ce Shielding effectiveness Electromagnetic interference Intermetallicparticles

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A review on electromagnetic shielding magnesium alloys

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Journal of Magnesium and Alloys 2021年第6期9卷 1906-1921页

作者： Lizi Liu Xianhua Chen Fusheng Pan chongqing Light Alloy Materials and Processing engineering technology research center Chongqing Three Gorges UniversityChongqing404130China College of Materials Science and engineering Chongqing UniversityChongqing 400045China National engineering research center for Magnesium Alloys Chongqing UniversityChongqing 400045China

Electromagnetic waves generated by electronic equipment are widely present in all living and working spaces because of the rapid development of electronic products and frequent use of digital *** shielding is an effective method of protection against these ***,the demand for materials with high electromagnetic shielding properties has remarkably ***(Mg)alloys,as potential electromagnetic shielding materials,have sparked great interest *** review highlights the effects of grain size,texture,alloying elements and second phase on the shielding properties of Mg *** progress on the shielding properties of Mg–Zn,Mg–Al,Mg–RE and other new shielding Mg alloys is then summarised,and the successful design of Mg alloys with superior electromagnetic shielding properties,such as Mg–Zn–Y–Ce–Zr,Mg–Sn–Zn–Ca–Ce,Mg–Gd–Y–Zn–Zr and Mg-based composite materials,is ***,this review provides insights into the future development and applications of Mg alloys with superior shielding properties.

关键词： Magnesium alloys Electromagnetic shielding Mechanical properties Microstructure Influencing factors

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