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分析了载荷对Mo_5SiB_2合金压痕裂纹影响规律,观察了压痕裂纹形貌特征,表征了裂纹长度与载荷的关系,确定了压痕裂纹系统,选取不同的压痕方程计算了室温断裂韧性KIC值,探讨了压痕载荷以及压痕方程对KIC值的影响关系。结果表明,Mo_5SiB_2合金压痕裂纹系统属于中位裂纹,只要选择合适的压痕方程,载荷并不影响断裂韧性值。压痕法测定Mo_5SiB_2合金断裂韧性合适的经验方程为KIC=0.8193H~(0.5)E~(0.5)a~2c~(-1.5),测得的其KIC值为2.63 MPa·m~(1/2)。
The influence of load on the indentation crack of Mo_5SiB_2 alloy was analyzed. The morphology of indentation crack was observed, the relationship between crack length and load was characterized, and the indentation crack system was determined. The KIC value of room temperature fracture toughness The effect of indentation load and indentation equation on KIC was discussed. The results show that the indentation crack system of Mo_5SiB_2 alloy belongs to the central crack. The loading does not affect the fracture toughness value as long as the appropriate indentation equation is selected. The suitable empirical equation for the determination of fracture toughness of Mo_5SiB_2 alloy by indentation method is KIC = 0.8193H ~ (0.5) E ~ (0.5) a ~ 2c ~ (-1.5), and the KIC value is 2.63 MPa · m ~ 2).