Microstructure and Mechanical Properties of Ultrasound-Assisted Soldered Al-50 wt.%Si/Al-27 wt.%Si Joints for Automotive Applications
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Hypereutectic Al-27 wt.%Si alloy and hypereutectic Al-50 wt.%Si alloy have been soldered using a Zn-5 wt.%Al interlayer without flux at 420°C in air with ultrasound assistance. The influence of the ultrasound on the migration of Si particles and the microstructure of the solidified Zn-Al-based alloys was investigated. The effect of the distribution of Si particles and the microstructure of the solidified Zn-Al-based alloys on the shear strength is also discussed. As the duration of the ultrasound was increased, the distribution of Si particles became more uniform. The highest average shear strength of the joints reached 70.41 MPa, with fracture mainly occurring at the Si particulate-reinforced Zn-Al-based composite joint.
This research was sponsored by the National Natural Science Foundation of China (Grant No. 51504165), the Foundation of the State Key Lab of Advanced Welding and Joining (Grant No. AWJ-M16-09), the Tianjin Sci. and Tec. Project (Grant Nos. 16JCQNJC02600, 17JCTPJC52800), and the project funded by the China Postdoctoral Science Foundation (Grant No. 2016M601271).
Conflict of interest
No conflict of interest exist regarding the submission of this manuscript, and the manuscript is approved by all authors for publication. I declare on behalf of my coauthors that the work described is original and has not been published previously nor is under consideration for publication elsewhere, in whole or in part. All listed authors have approved the manuscript.