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

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外文摘要：The diffusion processes in bicrystalline Cu/Al joints,characterized by typical high-angle grain boundaries(GBs),were investigated using molecular dynamics simulations.It was found that GBs facilitated the diffusion of both Cu and Al atoms,predominantly enhancing the migration of Cu atoms into Al matrix.According to mean squared displacement results,the movement of Al atoms within Al matrix was more vigorous than that of Cu atoms.The mechanisms of atomic rearrangement,dislocation movement,stacking fault formation,and dynamic recrystallization were analyzed.During 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 vacancies.During the advanced stages of welding,the plastic deformation primarily occurred within Al matrix,marked by the emergence of dislocations,stacking faults,and GB sliding.Particularly,the shearing effect during the ultrasonic welding process,combined with GB sliding,collectively induced grain recrystallization at the interface.Furthermore,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.

外文关键词：

Grain boundaryMolecular dynamicsDiffusion behaviorUltrasonic weldingDissimilar material

作者：

Jing-wei Yang、Chu-hao Xie、Jie Zhang、Zong-ye Ding、Jian Qiao

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作者单位：

School of Mechatronic Engineering and Automation,Foshan University,Foshan 528225,Guangdong,China

School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China

Shanghai Key Laboratory of Materials Laser Processing and Modification,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

State Key Laboratory of Advanced Brazing Filler Metals&Technology,Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd.,Zhengzhou 450001,Henan,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaGuangdong Basic and Applied Basic Research FoundationGuangdong Basic and Applied Basic Research FoundationFundamental Research Funds for the Central Universities

项目编号：

51805084519041872023B15151200862023A151514012400007706

出版年：

2024

DOI：

10.1007/s42243-024-01349-5

钢铁研究学报(英文版)

钢铁研究总院

钢铁研究学报(英文版)

CSTPCD

影响因子：0.584

ISSN：1006-706X

年,卷(期)：2024.31(10)