Reactive wetting of AgCuTi filler metal on the TiAl-based alloy substrate

► The wetting of AgCuTi on both polished and rough TiAl feature similar kinetics. ► Wetting kinetics within the main spreading stage features a power law of Rn ∼ t (n = 1). ► The reaction between the AgCuTi and TiAl controls the spreading process.