Al_2O_(3f)/Al复合材料的超声特性

ULTRASONIC CHARACTERISTIC OF THE Al_2O_(3f)/Al COMPOSITES

测量了体积含量Vf不同（5．4，9．1和13．6％）的Al2O3短纤维增强的铝基复合材料的纵波声速、横波声速和密度并由此得出它们的切变模量μ和杨氏模量E．结果发现，随Vf增加，纵波声速减小，横波声速增加；与纯铝相比，μ和E均明显增大．

The velocities of Iongitudinal and shear waves and the mean densities of three kinds of short fibre alumina (Al2O3) reinforced aluminum composites (Vf=5.4, 9.1 and 13.6%) were measured, from which the elastic moduli and the shear moduli were computed. The results show that the longitudinal velocities decrease and the shear velocities increase with the K increasing. Compare with pure aluminium, both of the shear moduli and the Young's moduli increase noticeably. The change of longitudinal sound velocity and attenuation as a function of temperature were given from 100 to 300K.The relationship between attenuation-temperature curve and intedece were discussed qualitatively.