EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

The extreme conditions of pressure and temperature during Ni/Ti alloys clads joining via the explosive welding process significantly influence the microstructure of the bonding zone, which has a direct impact on the quality and reliability of the connection. Thus, the detailed microstructural characterization of the welded zone is particularly important to design the optimal parameters of the welding process, such as the mutual location of the plates, the type of experimental setup, the distance between the plates, and the amount and type of explosive mixture. Moreover, due to the high-temperature working conditions of the final product, the correlation of the microstructural changes occurring in the neighborhood of the bonding zone after their exposure to elevated temperatures are crucial from the application point of view.
Therefore, the scientific objective of the study was a detailed characterization of the effect of the explosion welding process on the evolution of interface microstructure created between technically pure nickel (Ni201) and titanium (Ti Gr.1), together with the description of changes in chemical composition resulting from activated diffusion processes and the growth of the intermetallic phases in the interface zone, directly after EXW and after annealing process. The investigation of the microstructure of the Ni201/Ti Gr. 1 clads was carried out with variety of scanning and transmission electron microscopy techniques.

This research was financially supported by the Institute of Metallurgy and Materials Science of the Polish Academy of Sciences within the statutory work “The interface zone of the welds obtained with the use of explosion energy” Z-5/2021. The SEM, TEM research was conducted in the Accredited Testing Laboratories at the IMMS PAS.