Investigation on microstructure and internal friction for low density TiB2/ZL114 composites
来源期刊：Acta Metallurgica Sinica2009年第3期
论文作者：Haihong ZHAN Lingyan XU Zhengbing XU Jianmin ZENG Wenmao HUANG
Key words：LSM method; TiB2/ZL114 composites; Internal friction;
Abstract: TiB2/ZL114 composites with the density of 2.733 g/cm3 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 an-alyzer 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 9.04x10-3, 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 min×4 mm×2 mm, 40 mm×8 mm×2 mm and 40 mm×25 mm×2 mm are 8.83x 10-3, 8.89x 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.
Haihong ZHAN1，Lingyan XU1，Zhengbing XU1，Jianmin ZENG1，Wenmao HUANG1
(1.Key Laboratory of Nonferrous Materials & New Processing Technology,Ministry of Education,Guangxi University,Nanning 530004,China)
Abstract:TiB2/ZL114 composites with the density of 2.733 g/cm3 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 an-alyzer 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 9.04x10-3, 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 min×4 mm×2 mm, 40 mm×8 mm×2 mm and 40 mm×25 mm×2 mm are 8.83x 10-3, 8.89x 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.
Key words:LSM method; TiB2/ZL114 composites; Internal friction;
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