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Application of energy,electronic and interface bonding properties in highly reliable brazing joints between dissimilar materials

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Journal of Iron and Steel Research International 2024年第10期31卷 2344-2364页

作者： Xing-xing Wang Yuan-long Jiang Jia-shuo Chang Zhi-peng Yuan Jian-jun Shi Zi-cheng Ling Jun-yi Jiang Hong-gang Dong Fei Gao Jinhua Shuanghuan Brazing Alloys Co. Ltd.Jinhua321000ZhejiangChina School of materials Science and Engineering Dalian University of TechnologyDalian116024LiaoningChina Henan International Joint Laboratory of High-Efficiency Special Green Welding North China University of Water Resources and Electric PowerZhengzhou450045HenanChina Luoyang Bearing Research Institute Co. Ltd.Luoyang471000HenanChina

Brazing,an important welding and joining technology,can achieve precision joining of materials in advanced *** the first principle calculation is a new material simulation method in high-throughput *** can calculate the interfacial structure,band structure,electronic structure,and other properties between dissimilar materials,predicting various *** plays an important role in assisting practical research and guiding experimental designs by predicting material *** can largely improve the quality of welded components and joining *** relevant theoretical foundation is reviewed,including the first principle and density functional ***-correlation functional and pseudopotential plane wave approach was also ***,the latest research progress of the first principle in brazing was also *** application of first principle calculation mainly includes formation energy,adsorption energy,surface energy,adhesion work,interfacial energy,interfacial contact angle,charge density differences,density of states,and mulliken *** energy,mechanical,and electronic properties were ***,the limitations and shortcomings of the research in the first principle calculation of brazed interface were pointed *** developmental directions were presented to provide reference and theoretical basis for realizing high-throughput calculations of brazed joint interfaces.

关键词： Brazing First principle Joining interface Density functional theory Bonding property dissimilar material

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An atomic insight into effect of grain boundary on diffusion behavior of Cu/Al dissimilar materials undergoing ultrasonic welding

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Journal of Iron and Steel Research International 2024年第10期31卷 2555-2567页

作者： Jing-wei Yang Chu-hao Xie Jie Zhang Zong-ye Ding Jian Qiao School of Mechatronic Engineering and Automation Foshan UniversityFoshan528225GuangdongChina School of Mechanical Engineering University of Science and Technology BeijingBeijing100083China Shanghai Key Laboratory of materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China State Key Laboratory of Advanced Brazing Filler Metals&Technology Zhengzhou Research Institute of Mechanical Engineering Co.Ltd.Zhengzhou450001HenanChina

The diffusion processes in bicrystalline Cu/Al joints,characterized by typical high-angle grain boundaries(GBs),were investigated using molecular dynamics *** was found that GBs facilitated the diffusion of both Cu and Al atoms,predominantly enhancing the migration of Cu atoms into Al *** to mean squared displacement results,the movement of Al atoms within Al matrix was more vigorous than that of Cu *** mechanisms of atomic rearrangement,dislocation movement,stacking fault formation,and dynamic recrystallization were *** the compression and initial welding stages,the mismatch in lattice constants and the twisting of grains initiated a squeeze-induced rearrangement of Al atoms at the interface,leading to the formation of dislocations and *** the advanced stages of welding,the plastic deformation primarily occurred within Al matrix,marked by the emergence of dislocations,stacking faults,and GB ***,the shearing effect during the ultrasonic welding process,combined with GB sliding,collectively induced grain recrystallization at the ***,the diffusion between Cu/Al joints could be enhanced by increasing the vibration frequency,due to a significant rise in the number of amorphous regions.

关键词： Grain boundary Molecular dynamics Diffusion behavior Ultrasonic welding dissimilar material

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SEMI-WEIGHT FUNCTION METHOD ON COMPUTATION OF STRESS INTENSITY FACTORS IN dissimilar materialS

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Applied Mathematics and Mechanics(English Edition) 2004年第11期25卷 1241-1248页

作者：马开平柳春图 Institute of Mechanics Chinese Academy of Sciences Beijing 100080 P.R.China

Semi_weight function method is developed to solve the plane problem of two bonded dissimilar materials containing a crack along the bond. From equilibrium equation, stress and strain relationship, conditions of continuity across interface and free crack surface, the stress and displacement fields were obtained. The eigenvalue of these fields is lambda. Semi_weight functions were obtained as virtual displacement and stress fields with eigenvalue?_lambda. Integral expression of fracture parameters, K Ⅰ and K Ⅱ, were obtained from reciprocal work theorem with semi_weight functions and approximate displacement and stress values on any integral path around crack tip. The calculation results of applications show that the semi_weight function method is a simple, convenient and high precision calculation method.

关键词： dissimilar material interface crack stress intensity factor semi-weight function method plane fracture problem

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A CRACK EMANATING FROM THE TIP OF BONDED dissimilar materialS

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Applied Mathematics and Mechanics(English Edition) 1998年第5期19卷 463-478页

作者：钱俊长谷部宣男 Nanjing University of Science and Technology Nanjing P. R. China Nagoya Institute of Technology Japan

A crack is assumed to emanate from the tip of bonded dissimilar materials with the crack on the bisector of one of the bonded wedges. The problem is firstly divided into symmetric and anti-symmetric modes according to the characteristics of the local geometry. By eigenexpansion method, the eigenequations for the two modes are derived, respectively, and the corresponding eigenvalues are obtained with different ratios of dissimilar material constants and angles of the wedges. The singularity of the crack is then analyzed by the eigenvalues that are less than one. The fields of displacement and stress in the vicinity of the tip of the crack are finally derived in an explicit form.

关键词： dissimilar material singularity fields of displacement and stress

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Microstructure and mechanical properties of dissimilar Al-Cu joints by friction stir welding

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Transactions of Nonferrous Metals Society of China 2015年第6期25卷 1779-1786页

作者：张秋征宫文彪刘威长春工业大学先进结构材料教育部重点实验室长春130012

dissimilar friction stir welding between 1060 aluminum alloy and annealed pure copper sheet with a thickness of 3 mm was investigated. Sound weld was obtained at a rotational speed of 1050 r/min and a welding speed of 30 mm/min. Intercalation structure formed at the crown and Cu/weld nugget （WN） area promotes interracial diffusion and metallurgical bonding of aluminum and copper. However, corrosion morphology reveals the weak bonding mechanism of internal interface, which causes the joint failing across the interface with a brittle-ductile mixed fracture mode. The tensile strength of the joint is 148 MPa, which is higher than that of the aluminum matrix. Crystal defects and grain refinement by severely plastic deformation during friction stir welding facilitate short circuit diffusion and thus accelerate the formation of A14Cu9 and A12Cu intermetallic compounds （IMCs）. XRD results show that A14Cu9 is mainly in Cu/WN transition zone. The high dislocation density and formation of dislocation loops are the major reasons of hardness increase in the WN.

关键词： aluminum alloy copper friction stir welding dissimilar material microstructure mechanical properties

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Interface Microstructure of Al-Fe Tubes Joint by Magnetic Pulse Welding

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Journal of Iron and Steel Research International 2012年第S1期19卷 442-445页

作者： XU Zhi-dan YU Hai-ping LI Chun-feng HAN Yu-jie National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology The Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology

Magnetic Pulse Welding(MPW)is a very high speed process which produces solid-state *** this work, Welding interface microstructure of Al/Fe tubes by MPW and its influence factors were *** equipment with a capacitor of 100 μF was used under different voltages range from 8 kV to 15 *** and TEM observation were carried out to investigate microstructure of the welding *** results show that the dissimilar tubes(Al/Fe)could be welded with the optimum tapered angle of about 4 *** welding interface in Al/Fe joints exhibits a characteristic wavy morphology with wavelength of about I00 μm.A new layer exists between base tubes consisting of AI and Fe *** grained microstructure is founded near the welding *** results obtain in this work provide the fundamentals for the investigation of MPW mechanism of dissimilar tubes.

关键词： magnetic pulse welding dissimilar material ultrafine grained microstructure

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