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The limited high‐strain‐rate strength of conventional titanium alloys restricts their application in impact‐resistant scenarios. While graphene‐reinforced titanium matrix composites (TMCs) offer a promising alternative, the role of solution–aging treatment in regulating their microstructure and dynamic strengthening mechanisms remains unclear. This study investigated the relationship between microstructure and dynamic compression properties of TMCs by varying aging temperature. The results show that solution‐aging treatment markedly optimizes dynamic mechanical properties, which vary nonmonotonically with temperature. Aging at 550°C achieves the optimal strength–ductility balance with a dynamic compressive strength of 2100 MPa and a fracture strain of 13.3%. Aging treatment promotes the precipitation of fine, multioriented secondary α‐Ti phase (α s ) from the metastable β‐Ti matrix, which impedes dislocation motion. As the aging temperature increases, the precipitation strengthening effect from the increased α s content is counteracted by the coarsening of α s . Furthermore, appropriately sized α s phases coordinate with TiC to activate dislocations during deformation, enabling high plasticity while maintaining high strength. This study not only deepens the understanding of the deformation mechanisms in TMCs under solution–aging treatment, but also provides important guidance for the heat treatment design of impact‐resistant TMCs.
Sun et al. (Tue,) studied this question.