Synergistic Improvement of Mechanical Properties and Damping Capacities of Mg–Ti Interpenetrating‐Phase Composites via Metallurgical Bonding and Mechanical Interlocking Interface

Metal–metal interpenetrating phase composites (MMIPCs) have received increasing attention owing to their excellent mechanical and functional properties. However, a critical challenge in developing such materials lies in the design and fabrication of precursors that serve as structural skeletons. In this study, the mutually supported and interlocked Mg–Ti interpenetrating phase composites (MTIPCs) preforms are prepared by twisting, melting, and solidification. This method yields a unique architecture where the Mg alloy is spatially continuous while the Ti has a regular distribution characteristic. To further optimize the microstructure, the MTIPCs preforms undergo extrusion deformation, utilizing the synergistic interactions between the two components with different properties while maintaining the internal spatial layout. The resulting extruded MTIPCs (E‐MTIPCs) develop a reinforced‐concrete‐type heterostructure with a mixed bimodal structure. This nonuniform microstructure generates strain gradients during the plastic deformation process, thereby promoting the formation of geometrically necessary dislocations (GNDs) and further contributing to hetero‐deformation‐induced (HDI) strengthening and hardening. Moreover, the diffusion of the Al element and the deformation coordination between the two components facilitate metallurgical bonding and sawtooth mechanical interlocking at the Mg–Ti interface. Consequently, E‐MTIPCs exhibit synergistic enhancement in both mechanical properties and damping capacities.