**5. Conclusions**

Ti6Al4V was successfully welded with Al-1060 by explosive welding. The welded interface between Ti and Al was smooth and straight without any jet trapping. The maximum portion of the interfacial zone existed in the base side (Al-1060) where different phases of titanium aluminide were observed. Mechanical results, i.e., tensile test, bending test, shear test and Vickers hardness test, showed that welding quality was not highly affected by these titanium aluminides.

Heat treatment process stretched the interfacial zone with some titanium island/peninsula like shape. Due to this, strength of welded material was decreased as compared to the normal welded sample, but ductility was improved.

Numerical simulation depicted that impact pressure at all contact points had larger values than the yield strength of both welded materials, which is one of the basic requirements to meet the welding conditions. Furthermore, simulation results showed that in the interfacial zone, plastic deformation had values more than 5 and both materials obtained their melting points during impact. Melting of both materials provide a reason to form titanium aluminides. Since pressure, plastic deformation and temperature distribution for both materials (flyer and base) had different values, therefore, both materials had different interfacial thickness.

**Author Contributions:** Conceptualization, Y.M. and P.C.; explosive welding, Y.M. and Q.Z.; microstructure examination and mechanical tests, Y.M., A.A.B. and A.A.; numerical simulation, Y.M., K.D. and Q.Z.; writing–original draft manuscript, Y.M.; writing–review and editing, K.D. and P.C.

**Funding:** This research was funded by the National Natural Science Foundation of China (Grant No. 11521062) and State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology (Grant No. ZDKT18-01).

**Conflicts of Interest:** The authors declare no conflict of interest.
