Investigation on microstructure and internal friction for low density TiB2/ZL114 composites

doi:10.1016/S1006-7191(08)60091-5

Abstract

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 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 9.04x10^-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 mmx4 mmx2 mm, 40 mmx8 mmx2 mm and 40~mm$\times 25 mmx2 mm are 8.83x10^-3, 8.89x10^-3, and 8.93x10^-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

Wenmao HUANG,Haihong ZHAN,Lingyan XU,Zhengbing XU,Jianmin ZENG. Investigation on microstructure and internal friction for low density TiB₂/ZL114 composites[J]. Acta Metallurgica Sinica (English Letters), 2009, 22(3): 211-218.

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Investigation on microstructure and internal friction for low density TiB₂/ZL114 composites

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