期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 271, 期 -, 页码 75-84出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2019.03.013
关键词
Ultrasonic vibrations; Friction stir welding; Aluminum alloys; Microstructure; Mechanical properties
资金
- National Natural Science Foundation of China [51775143, 51435004]
- Defense Industrial Technology Development Program [JCKY2017203B066]
- Innovation Program of Chinese Welding Society
- Project to Create Research and Educational Hubs for Innovative Manufacturing in Asia, Osaka University of Special Budget Project of the Ministry of Education, Culture, Sports, Science and Technology
Friction stir welding assisted by ultrasonic vibrations on the bottom surface of workpieces (UVBS- FSW) is proposed. The aim of this study is to reveal the effect of ultrasonic vibrations on the microstructure and mechanical properties of the joint. For comparative purposes, another joint without the effect of ultrasonic vibrations was obtained using the same welding parameters. The morphologies of onion skin on the top surface are changed and the distance from the wave crest to the trough is directly reduced from 90 +/- 3 mu m to 67 +/- 3 mu m as a result of the ultrasonic vibrations. The macrostructures indicate that more material around the probe is softened and takes part in the plastic deformation due to the Blaha effect of the ultrasonic vibrations. A higher intensity of the texture and typical B/(B) over bar texture component in the stir zone (SZ) were detected in the UVBS-FSW joint. The hardness distributions are more homogeneous and the density of geometrically necessary dislocations, stored strain energy and residual stress in the joint are all reduced due to the application of the ultrasonic vibrations. Finally, the tensile property and fracture elongation of the joint are improved by UVBS-FSW.
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