Characterization of Mo/Mo2C interface in MoSiBTiC alloy

TiC-added Mo-Si-B alloys are stably composed of Mo ss , Mo 5 SiB 2 , (Ti, Mo)C, and (Mo, Ti) 2 C phases. In the alloys, interfacial cracking mainly occurred at the interface between Mo ss and Mo 5 SiB 2 (T 2 ). Thus, other interfaces such as between Mo ss , (Ti, Mo)C and (Mo, Ti) 2 C were investigated for understanding the mechanical properties. The above three kinds of the interfaces have special atomistic structures probably favorable to the mechanical properties. At the interface of Mo ss /(Mo, Ti) 2 C, (Mo, Ti) 2 C decomposes into Mo ss and (Ti, Mo)C, and then serrated, blade-shaped interfaces are formed. The Mo ss /(Ti, Mo)C interface has an orientation relationship of (110) Mo //(111) (Ti, Mo)C . The (Ti, Mo)C/(Mo, Ti) 2 C interface forms a ledge and terrace semi-coherent structure, and its orientation relationship is (111) (Ti, Mo)C //(100) (Mo, Ti) 2 C and [0 1 ¯ 1] (Ti, Mo)C //[010] (Mo, Ti) 2 C . Therefore, Mo ss , (Ti, Mo)C and (Mo, Ti) 2 C have good coherency in the MoSiBTiC alloy. (119 words)