Abstract: | In this study the relationship between Q-1 and the microstructural characteristics of SiCPCS/Al composites was investigated. Seven specimens made by various processes were divided into three groups and their Q-1-T spectra were compared. The temperature dependence of internal friction up to 500°C was measured by vacuum inverse torsional pendulum apparatus. For the SiCPCS/Al composite fabricated by the liquid infiltration method, Q-1 increased more and more rapidly with rising temperature when the extent of fiber-matrix interfacial reaction intensified. For hot-pressed plates fabricated from preform wires and Al(1050) foils, poor diffusion bonding between the preform wires and A1 foils was introduced; this new interface is primarily responsible for the temperature dependence of Q-1. |