Statistical analysis for the strength and thermal shock behavior of MoAlB

Abstract The statistical distribution for the strength as well as thermal shock behavior of high‐purity MoAlB, fabricated via self‐propagating high‐temperature combustion synthesis with hot pressing (SHS/HP), was investigated. Among the statistical distribution models, the three‐parameter Weibull (3P‐Weibull) method exhibited the best fit for the flexural strength of MoAlB, with the primary error in the low‐stress region. Notably, the 3P‐Weibull modulus of MoAlB fell between those of typical metals and ceramics, aligning with the trends in fracture toughness and thermal conductivity. Its critical thermal shock temperature ranges from 100°C to 200°C. The introduced pores did not only enhance thermal shock resistance across the entire temperature range, but also result in an abnormal strength recovery above 1000°C, which suggests that pores play a significant role in the abnormal strength recovery after water quenching, in addition to the established explanations such as the formation of oxide layer and grain kinking.