The Fracture Toughness and DBTT of MoB Particle-Reinforced MoSi_2 Composites

摘要

The room temperature fracture toughness and the high temperature DBTT of MoB particle-reinforced MoSi_2 composites were investigated using Vickers indentation technique and MSP testing method, respectively. Modified Small Punch (MSP) test is a method for evaluation of mechanical properties using very small specimens, and it's appropriate for the determination of strength and DBTT. It was found that the approximate fracture toughness of the composite is 1.3 times that of monolithic MoSi_2, and its DBTT is 100℃ higher than that of monolithic MoSi_2 materials. Cracks deflection is a probable mechanism responsible for this behavior.