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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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Improved distortion prediction in additive manufacturing using an experimental-based stress relaxation model

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Journal of Materials Science & Technology 2020年第24期59卷 83-91页

作者： ruishan xie Qingyu Shi Gaoqiang Chen State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Key Laboratory for Advanced Material Processing Technology Ministry of EducationBeijing 100084China

In additive manufacturing(AM),numerous thermal cycles make stress relaxation a significant factor in affecting the material mechanical ***,the traditional material constitutive model cannot describe repeated annealing ***,we propose an improved constitutive model based on a serial of stress relaxation experiments,which can descript the temperature and time-dependent stress relaxation behavior during *** using the proposed relaxation model,the prediction accuracy is significantly improved due to the recovery of inelastic strain during multilayer *** results are validated by both in-situ and final distortion *** influence mechanism of the relaxation behavior on material mechanical response is explained by the three-bar model in thermo-elastic-plastic *** relaxation behavior during the whole AM process is *** stress behavior is found to have a limited effect when merely depositing several layers;nevertheless,it becomes a prominent impact when depositing multiple *** proposed model can enhance modeling accuracy both in AM and in multilayer welding.

关键词： Additive manufacturing Welding Thermo-mechanical modeling Distortion prediction Stress relaxation

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Interfacial Structure and Formation Mechanism of Ultrasonic-assisted Brazed Joint of SiC Ceramics with Al—12Si Filler Metals in Air

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Journal of Materials Science & Technology 2017年第5期33卷 492-498页

作者： Xiaoguang Chen ruishan xie Zhiwei Lai Lei Liu Jiuchun Yan Guisheng Zou State Key Laboratory of Advanced Welding and Joining School of Materials Science and Engineering Harbin Institute of Technology Department of Mechanical Engineering Key Laboratory for Advanced Manufacturing by Materials Processing Technology Tsinghua University College of Material Science and Engineering Taiyuan University of Technology

Ultrasonic-assisted brazing of SiC ceramics was performed by filling with an Al-12Si alloy at a low tem- perature of 620 ℃ in air. The interracial characteristics and formation mechanism were investigated. The joint shear strength reached 84-94 MPa using the ultrasonic time of 2-16 s. The fracture morphology showed that the fracture path initiated and propagated in the joint alloy. The thin film of amorphous SiO2 that formed on the SiC surface was non-uniformly decomposed and diffused into the liquid Al-12Si alloy under the cavitation erosion effect of ultrasound. Abnormal isolated blocks of A12SiO5 compounds formed at the interface between Al-12Si and a thicker SiO2 layer formed during the thermal oxidation treatment of the SiC ceramic. The SiO2 layer on the SiC ceramic did not hinder or impair the wetting and bonding process, and a stronger bond could form between Al-12Si and SiO2 or SiC in ultrasonic- assisted brazing.

关键词： Ultrasonic Brazing Ceramic Interface Cavitation erosion

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Ultrasound-Assisted Transient Liquid Phase Bonding of Magnesium Alloy Using Brass Interlayer in Air

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Journal of Materials Science & Technology 2017年第6期33卷 567-572页

作者： Zhiwei Lai ruishan xie Chuan Pan Xiaoguang Chen Lei Liu Wenxian Wang Guisheng Zou School of Materials Science and Engineering Tsinghua University Department of Mechanical Engineering Key Laboratory for Advanced Manufacturing by Materials Processing Technology Tsinghua University China Iron & Steel Research Institute Group R&D Department Yongtai Electric (Dong Guan) Co. Ltd College of Materials Science and Engineering Shanxi Key Laboratory of Advanced Magnesium-based Materials Taiyuan University of Technology

The microstructure evolution and oxide film behavior in ultrasound-assisted transient liquid phase（U-TLP） bonding of Mg alloy were investigated by applying different ultrasonic time at 460？C with brass interlayer in air. The results indicated that with increasing ultrasonic time, brass interlayer disappeared gradually and the Mg-Cu-Zn eutectic compounds were formed. The eutectic compounds in the joint decreased as the ultrasonic time increased further. The oxide removal process was divided into four steps. Continuous oxide film at the interface was partially fractured by ultrasonic vibration,and then suspended into liquid by undermining eutectic reaction. After that, the suspended oxide film was broken into small oxide fragments by ultrasonic cavitation effect, which was finally squeezed out of the joint by ultrasonic squeeze action. In addition, the mechanical properties of the joints were investigated. The maximum shear strength of the joint reached 105 MPa, which was 100% of base metal.

关键词： Magnesium alloy Bonding Ultrasound Oxide film Microstructure

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MATLAB软件在铰链四杆机构运动分析中的应用探索

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黄河科技学院学报 2024年第11期26卷 43-48页

作者：陈颖谢瑞山北京工业大学机械与能源工程学院北京100124

铰链四杆机构可实现多种运动的变换,在仿生机械、智能装备等领域具有广阔的应用前景。针对当前铰链四杆机构可视化分析平台侧重运动线图绘制的局限,探索MATLAB软件图形用户界面App Designer功能在铰链四杆机构运动分析中的应用。通过开... 详细信息

铰链四杆机构可实现多种运动的变换,在仿生机械、智能装备等领域具有广阔的应用前景。针对当前铰链四杆机构可视化分析平台侧重运动线图绘制的局限,探索MATLAB软件图形用户界面App Designer功能在铰链四杆机构运动分析中的应用。通过开发一套多功能铰链四杆机构运动分析平台,研究交互式参数设计与机构运动动态演示的实现方法,实现了四杆机构轨迹特性、急回特性等多项运动性能的定量与定性分析。多项运动性能的分析结果以图形或动画的形式展现,包括连杆曲线的生成过程、极位构型、运动线图等。该平台有助于建立机构设计参数与多项运动特性的关系,明确行程速度变化系数、极位夹角等指标对急回程度的影响,为复杂机械结构的创新设计奠定基础。

关键词：运动特性铰链四杆机构 MATLAB 图形用户界面

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Mg/Al合金爆炸焊连接及其界面接合机制

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机械工程学报 2016年第12期52卷 52-58页

作者：张婷婷王文先袁晓丹刘瑞峰谢瑞山太原理工大学材料科学与工程学院太原030024 太原理工大学先进镁基材料山西省重点实验室太原030024

采用爆炸焊接技术制备以AZ31B镁合金为基板,以6061铝合金为覆板的AZ31B/6061合金的层状复合板。对复合板界面的宏观形貌、微观组织、界面元素扩散行为及界面接合性能进行测试、分析。结果表明:AZ31B/6061合金爆炸复合板接合界面呈波状接... 详细信息

采用爆炸焊接技术制备以AZ31B镁合金为基板,以6061铝合金为覆板的AZ31B/6061合金的层状复合板。对复合板界面的宏观形貌、微观组织、界面元素扩散行为及界面接合性能进行测试、分析。结果表明:AZ31B/6061合金爆炸复合板接合界面呈波状接合;靠近接合界面处的塑性变形程度最大,以孪晶和再结晶形式为主;在AZ31B一侧靠近界面处出现与界面呈45°的绝热剪切带组织,带内为动态再结晶形成的细晶粒组织;接合界面两侧的显微硬度分布为:随着距离接合界面的增大,AZ31B和6061侧的显微硬度值递减趋势;复合板的拉-剪试验结果表明,界面接合强度达193.3 MPa;复合板界面接合机制为压力焊、扩散焊及局部熔化焊综合作用的结果。

关键词： Mg/Al合金爆炸焊接界面接合机制

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航空航天领域轻合金缺陷修复研究现状及发展趋势

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航天制造技术 2023年第2期 1-9页

作者：刘海滨徐添乐谢瑞山北京工业大学北京100124

修复与再制造是经先进技术修复后使废旧产品质量达到甚至超过新品的操作。本文总结了熔化类修复方法(激光、电弧、电子束增材修复方法等)和基于搅拌摩擦的固相修复方法的研究进展。对比分析了各种修复方法的可修复缺陷形式、是否可连续... 详细信息

修复与再制造是经先进技术修复后使废旧产品质量达到甚至超过新品的操作。本文总结了熔化类修复方法(激光、电弧、电子束增材修复方法等)和基于搅拌摩擦的固相修复方法的研究进展。对比分析了各种修复方法的可修复缺陷形式、是否可连续送料、修复后样件强度及是否产生新缺陷等问题。以轴向送料的搅拌摩擦沉积技术及侧向送料的摩擦辊压增材制造技术为代表的可连续送料固相修复技术克服了金属构件在熔化类修复过程中易造成组织粗化,产生孔隙、裂纹的技术难题,是航空航天、轨道交通等领域的高强高韧铝合金、轻质镁合金等轻质合金构件修复领域的发展趋势。最后指出可连续送料固相修复技术的研究仍处于起步阶段,开展固相缺陷修复技术的理论研究、开展不同材料的缺陷修复工艺研究及工程化应用、加快相关修复装备的建立是未来亟需研究的重点工作。

关键词：金属缺陷修复熔化类修复方法固相修复方法接头强度伸长率

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云雾苔草与蜈蚣草联合修复重金属污染土壤初探

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有色金属（矿山部分） 2017年第4期69卷 1-4页

作者：王瑞山谢容生杨艺行王少龙云南驰宏锌锗股份有限公司云南曲靖655011 昆明冶金研究院昆明650031 云南农业大学昆明650021

由采矿、冶炼、加工及废弃物处置等造成的重金属污染土壤问题日益严重,环境污染影响越显突出。围绕云雾苔草与蜈蚣草超富集植物间种对重金属污染土壤联合修复的运用与实践进行试验探索。结果表明,分别采用云雾苔草、蜈蚣草和两者间种联... 详细信息

由采矿、冶炼、加工及废弃物处置等造成的重金属污染土壤问题日益严重,环境污染影响越显突出。围绕云雾苔草与蜈蚣草超富集植物间种对重金属污染土壤联合修复的运用与实践进行试验探索。结果表明,分别采用云雾苔草、蜈蚣草和两者间种联合修复重金属污染土壤,铅、锌、铜、镉、砷等重金属含量均呈逐年下降趋势,间种方式的修复效果明显优于单独种植的效果。采用云雾苔草和蜈蚣草间种方式联合修复重金属土壤,对污染土壤的重金属修复效果持续有效,土壤中铅、锌、铜、镉、砷的浓度可降低至12.54mg/kg、40.21mg/kg、11.23mg/kg、0.06mg/kg和0.32mg/kg。

关键词：云雾苔草重金属联合修复超富集

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Biocatalytic access to diverse prenylflavonoids by combining a regiospecific C-prenyltransferase and a stereospecific chalcone isomerase

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Acta Pharmaceutica Sinica B 2018年第4期8卷 678-686页

作者： Jianhua Li Ridao Chen ruishan Wang Xiao Liu Kebo xie Dawei Chen Jungui Dai State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia MedicaPeking Union Medical College and Chinese Academy of Medical Sciences Key Laboratory of Biosynthesis of Natural Products of National Health and Family Planning Commission Institute of Materia MedicaPeking Union Medical College and Chinese Academy of Medical Sciences

Prenylflavonoids are valuable natural products that have diverse biological properties, and are usually generated biologically by multiple metabolic enzymes in nature. In this study, structurally diverse prenylflavonoids were conveniently synthesized by enzymatic catalysis by combining GuILDT, a regiospecific chalcone prenyltransferase, and Gu CHI, a stereospecific chalcone isomerase that has promiscuous activity for both chalcones and prenylchalcones as substrates. Our findings provided a new approach for the synthesis of natural/unnatural bioactive prenylflavonoids, including prenylchalcones and optical prenylflavanones with chalcone origins.

关键词： Biocatalysis Prenyltransferase Chalcone isomerase Licorice Prenylflavonoids

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Unclear but present danger:An asymptomatic SARS-CoV-2 carrier

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Genes & Diseases 2020年第4期7卷 558-566页

作者： Xuejing Yu Dongchuan Ran Jinhui Wang Yuan Qin ruishan Liu Xueli Shi Yiping Wang Chang xie Jia Jiang Jianzhong Zhou University of Utah School of Medicine Cardiothoracic Surgery Department15 N.Medical Drive Room 552084112-5650Salt Lake CityUTUSA Chongqing University Three Gorges Hospital #165 Xincheng RoadWanzhou DistrictChongqing404000China The First Affiliated Hospital of Chongqing Medical University #1 Yuanjiagang Youyi RoadYuzhong DistrictChongqing400016China

Superspreaders are critical infectious resources in multiple infectious *** can be asymptomatic or present mild symptoms but can transmit pathogens to susceptible populations,leading to severe symptoms,and even *** identification of this population is extremely important to inhibit the spread of infectious *** now,the whole global world is suffering from a devastating infectious disease caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2).In this article,a superspreader cluster event in coronavirus disease 2019(COVID-19)was identified by tracking contacting histories of infected *** cluster was found to be originated from an asymptomatic SARS-CoV-2 carrier,which resulted in 13 secondary cases getting *** the secondary patients presented with non-typical symptoms of COVID-19,such as fever,dry cough,and myalgia,one of which died of respiratory failure at the *** this cluster,we learn that people with older ages,low immunity,multiple underlying diseases,especially pulmonary diseases,can contribute to a poor ***,asymptomatic superspreaders of COVID-19 can be extremely dangerous and must be handled time-efficiently.

关键词： Asymptomatic Coronavirus COVID-19 SARS-CoV-2 Superspreader

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