超声功率对UVeFSW铝-镁合金异质接头组织与性能的影响

doi:10.3901/JME.2020.06.024

机械工程学报 ›› 2020, Vol. 56 ›› Issue (6): 24-32.doi: 10.3901/JME.2020.06.024

• 铝与镁/铜合金的焊接 • 上一篇下一篇

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超声功率对UVeFSW铝-镁合金异质接头组织与性能的影响

赵俊杰, 宿浩, 石磊, 武传松

山东大学材料液固结构演变与加工教育部重点实验室济南 250061

收稿日期:2019-09-27 修回日期:2019-12-10 出版日期:2020-03-20 发布日期:2020-05-12
作者简介:赵俊杰,男,1993年出生,博士研究生。主要研究方向为异种材料搅拌摩擦焊接。E-mail:1169731638@qq.com;
武传松(通信作者),男,1959年出生,博士,教授,博士研究生导师。主要研究方向为焊接物理、高效焊接工艺过程的数值模拟与测试控制。E-mail:wucs@sdu.edu.cn
基金资助:
国家自然科学基金资助项目（51842507）。

Effect of Exterted Ultrasonic Power on Microstructure and Properties of Dissimilar Al/Mg Alloys UVeFSW Joints

ZHAO Junjie, SU Hao, SHI Lei, WU Chuansong

Key Laboratory for Liquid-Solid Structure Evolution and Materials Processing(Ministry of Education), Shandong University, Jinan 250061

Received:2019-09-27 Revised:2019-12-10 Online:2020-03-20 Published:2020-05-12

摘要/Abstract

摘要： 将超声振动辅助搅拌摩擦焊接（Ultrasonic vibration enhanced friction stir welding-UVeFSW）新工艺用于铝-镁异质合金的连接。选取低（75 W）、中（220 W）、高（550 W）三档超声功率，比较和分析了超声功率变化对焊接载荷、焊缝宏观金相、金属间化合物层及接头拉伸性能的影响。结果表明，当外加超声功率适当时，超声作用与搅拌摩擦焊接过程本身的热-力-流耦合机制产生最佳的协同效应。超声振动在搅拌摩擦焊接过程中的作用效果并不是随着超声功率的提高而一直增强；只有在超声功率适中时，焊接过程和接头组织与性能的改善效果最大。从超声的声软化效应、减摩效应、促进位错湮灭等方面，对试验结果给予了初步解释。

关键词: 搅拌摩擦焊接, 超声功率, 铝合金, 镁合金, 接头组织与性能

Abstract: The ultrasonic vibration enhanced friction stir welding(UVeFSW) process is employed to join dissimilar aluminum-magnesium alloys. Three levels of ultrasonic power, i.e., low (75 W), medium (220 W) and high (550 W), are selected to conduct UVeFSW experiments. The effects of ultrasonic power levels on the welding load, the weld macrographs, the intermetallic compound layers and the tensile properties of weld joints are compared and analyzed. The results show that when the applied ultrasonic power is appropriate, the best synergistic effect can be obtained between the ultrasonic effect and the thermo-mechanical-material flow coupling mechanism of friction stir welding process itself. The effect of ultrasonic vibration in friction stir welding process is not always enhanced with the increase of ultrasonic power; only when the ultrasonic power is moderate, the effect of improving the welding process and joint structure and properties is the greatest. The experimental results are explained preliminarily in terms of sound softening effect, friction reduction effect and dislocation annihilation.

Key words: friction stir welding, ultrasound power, aluminum alloy, magnesium alloy, joint microstructure and property

中图分类号:

TG453

赵俊杰, 宿浩, 石磊, 武传松. 超声功率对UVeFSW铝-镁合金异质接头组织与性能的影响[J]. 机械工程学报, 2020, 56(6): 24-32.

ZHAO Junjie, SU Hao, SHI Lei, WU Chuansong. Effect of Exterted Ultrasonic Power on Microstructure and Properties of Dissimilar Al/Mg Alloys UVeFSW Joints[J]. Journal of Mechanical Engineering, 2020, 56(6): 24-32.

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超声功率对UVeFSW铝-镁合金异质接头组织与性能的影响

Effect of Exterted Ultrasonic Power on Microstructure and Properties of Dissimilar Al/Mg Alloys UVeFSW Joints

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