Interfacial plasticity of a TiB2-reinforced steel matrix composite fabricated by eutectic solidification

The interfacial property between TiB2 particles and the ferrite matrix in a steel matrix composite (SMC) fabricated by eutectic solidification was investigated by nanoindentation. The significant work hardening of TiB2/ferrite interface before interfacial debonding during deformation has been revealed for the first time in this new class of SMC. Such interfacial plasticity, proven by the high dislocation density generated and stored at the TiB2/ferrite interface, is responsible for the excellent ductility of this class of SMC.