The study of microstructure, corrosion resistance and mechanical properties of ultrasonic assisted welding-brazing of Ti-Mg

In order to refine microstructures, enhance corrosion resistance and mechanical properties of Ti/Mg joints, the ultrasonic vibration assistance (UVA) treatment were applied during the welding-brazing of Ti/Mg dissimilar metal. The specific impacts and mechanisms of UVA on the microstructure evolution and mechanical enhancement were investigated. The experiment results express that with the aid of UVA process, the coarse grains in weld zone were effectively refined attributed to ultrasonic induced acoustic streaming and cavitation effects. Meanwhile more tenacious and adherent protective layer of Mg(OH)(2) occurred and reduced corrosion rate of weld zone. Under the optimized ultrasonic parameter of 1.2 kW, the mechanical property of Ti/Mg joint was improved 11.4% to 225 MPa, compared with joints without the aid of ultrasonic treatment. (c) 2022 The Authors. Published by Elsevier B.V.

Automated summary

In this study, ultrasonic vibration assistance (UVA) treatment was applied to improve the microstructure, corrosion resistance, and mechanical properties of Ti/Mg dissimilar metal joints. The UVA process successfully refined the coarse grains in the weld zone, resulting in the formation of a more tenacious and adherent protective layer and a reduced corrosion rate. Under the optimized ultrasonic parameters, the mechanical property of the Ti/Mg joint was improved by 11.4% compared to joints without ultrasonic treatment.