TiB2/ZL114 composites with the density of 2.733 g/cm^3 were fabricated through reaction of K2TiF4 and KBF4 （LSM method）. The composites were characterized by X-ray diffraction （XRD） and scanning electron microsco...TiB2/ZL114 composites with the density of 2.733 g/cm^3 were fabricated through reaction of K2TiF4 and KBF4 （LSM method）. The composites were characterized by X-ray diffraction （XRD） and scanning electron microscope （SEM）. The internal friction measurements were performed on DTM-II-J dynamic modulus damping analyzer and the mechanisms were investigated. Experimental results indicate that reinforced particles are well-distributed in the matrix and the internal friction value of TiB2/ZL114 composites is up to a maximum of 9.04×10^-3, almost twice that of ZL114. The internal friction results form dislocation vibration within the material, the sliding of grain boundary and phase interface, and together with the micro-plastic deformation caused by difference in coefficients of thermal expansion and elasticity modulus of various phases. The average internal friction values of samples with the sizes of 40 mm×4 mm×2 mm, 40 mm×8 mm×2 mm and 40 mm×25 mm×2 mm are 8.83 ×10^-3, 8.89 × 10^-3, and 8.93× 10^-3, respectively. Thus, the developed composites are of low density, high internal friction, and the sizes of samples have no relation to the internal friction behavior.展开更多
基金financial support from the National Natural Science Foundation of China (No.50864002)from the Innovation Project of Guangxi Graduate Education (No.2008105930805M076)
文摘TiB2/ZL114 composites with the density of 2.733 g/cm^3 were fabricated through reaction of K2TiF4 and KBF4 （LSM method）. The composites were characterized by X-ray diffraction （XRD） and scanning electron microscope （SEM）. The internal friction measurements were performed on DTM-II-J dynamic modulus damping analyzer and the mechanisms were investigated. Experimental results indicate that reinforced particles are well-distributed in the matrix and the internal friction value of TiB2/ZL114 composites is up to a maximum of 9.04×10^-3, almost twice that of ZL114. The internal friction results form dislocation vibration within the material, the sliding of grain boundary and phase interface, and together with the micro-plastic deformation caused by difference in coefficients of thermal expansion and elasticity modulus of various phases. The average internal friction values of samples with the sizes of 40 mm×4 mm×2 mm, 40 mm×8 mm×2 mm and 40 mm×25 mm×2 mm are 8.83 ×10^-3, 8.89 × 10^-3, and 8.93× 10^-3, respectively. Thus, the developed composites are of low density, high internal friction, and the sizes of samples have no relation to the internal friction behavior.
