<i>In situ</i> synthesis of dispersed boride-induced high-performance brazed DD5 superalloy <i>via</i> the formation of a novel sandwich-structured interlayer.

//[110] γ, corresponding to lattice mismatches of 15.3%, 7.3%, and 5.2%, respectively. The fracture mode transformed from brittle cleavage to a ductile-brittle mixed mode with abundant ductile dimples. This strategy provides a viable pathway for fabricating high-performance brazed single-crystal joints.