Formation and properties of lamellar structural weld of aluminum alloy under ultrasonic impact

被引：1

作者：

Chen Q.-H. ^{[1
,2
]}

Wang C.-C. ^{[1
]}

Xie Z.-Y. ^{[1
]}

Mao X.-Y. ^{[1
]}

Lin S.-B. ^{[2
]}

机构：

[1] School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang

[2] State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2023年 / 33卷 / 08期

基金：

中国国家自然科学基金;

关键词：

7A04 aluminium alloy; arc; lamellar structure; strengthening and toughening; ultrasonic impact assisted welding;

D O I：

10.11817/j.ysxb.1004.0609.2022-43536

中图分类号：

学科分类号：

摘要：

In this paper, 7A04 high-strength aluminum alloy was taken as the welding object, ultrasonic horn was used to carry out ultrasonic impact on the base metal on both sides of the weld during the process of tungsten inert gas welding. A kind of lamellar structure weld with alternating distribution of columnar crystal and equiaxed crystal was constructed, and the change of weld formation, microstructure and properties was investigated. The results show that low frequency mechanical impact has adverse effects on welding. The weld width and weld depth are reduced, and the weld grain is coarsened. The second phase shows local uneven distribution along the impact direction, and the joint strength and plasticity decrease. After coupling periodic ultrasound on the basis of low-frequency mechanical impact, the elongation increases from 2.57 % to 4.18 %, and the tensile strength increases from 259.65 MPa to 351.51 MPa. The weld width and weld depth are increased. The weld grain is significantly refined when the ultrasonic amplitude is 22.8 μm. The second phase is fine and dispersively distributed. However, the effect of periodic ultrasound increases the fusion ratio of the weld, resulting in the deterioration of the corrosion resistance of the weld. © 2023 Central South University of Technology. All rights reserved.

引用

页码：2441 / 2455

页数：14

共 22 条

[1] WANG Y F, WANG M S, YIN K, Et al., Yielding and fracture behaviors of coarse-grain/ultrafine-grain heterogeneous-structured copper with transitional interface[J], Transactions of Nonferrous Metals Society of China, 29, 3, (2019)
[2] WU X L, YANG M X, YUAN F P, Et al., Heterogeneous lamella structure unites ultrafine-grain strength with coarse-grain ductility[J], Proceedings of the National Academy of Sciences of the United States of America, 112, 47, (2015)
[3] MA X L, HUANG C X, XU W Z, Et al., Strain hardening and ductility in a coarse-grain/nanostructure laminate material[J], Scripta Materialia, 103, (2015)
[4] YUAN R, BEYERLEIN I J, ZHOUC Z., Homogenization of plastic deformation in heterogeneous lamella structures[J], Materials Research Letters, 5, 4, (2017)
[5] ZHU Q, LEI Y C, WANG Y L, Et al., Effects of arc-ultrasonic on pores distribution and tensile property in TIG welding joints of MGH956 alloy, Fusion Engineering and Design, 89, 12, (2014)
[6] WANG D Q, HUA C, LU H., Numerical analysis of ultrasonic waves in the gas tungsten arc welding (GTAW) with ultrasonic excitation of current, International Journal of Heat and Mass Transfer, 158, (2020)
[7] ZHU Ping, YU Chun, Microstructure analysis of 316L weld under different ultrasonic frequency arc, Hot Working Technology, 52, 7, (2023)
[8] CHEN C, FAN C L, CAI X Y, Et al., Ultrasonic irradiation induced the microstructure refinement and texture evolution of Ti-6Al-4V TIG weld seam[J], Science and Technology of Welding and Joining, 25, 1, (2020)
[9] WANG J F, SUN Q J, TENG J B, Et al., Enhanced arc-acoustic interaction by stepped-plate radiator in ultrasonic wave-assisted GTAW[J], Journal of Materials Processing Technology, 262, (2018)
[10] YANG F Z, LIU B., Microstructure evolution and strengthening mechanism of galvanized steel/Mg alloy joint obtained by ultrasonic vibration-assisted welding process, Materials, 14, 7, (2021)

← 1 2 3 →