INFLUENCE OF Al-5Ti-1B MASTER ALLOY ON MICROSTRUCTURE AND DAMPING CAPACITY OF ZA27ALLOY
来源期刊：中国有色金属学报(英文版)1998年第3期
论文作者：Zhang Zhongming Wang Jinchen Lu Yili Song Guangsheng Yang Gencang Zhou Yaohe
文章页码：500 - 504
Key words：ZA27 alloy； Al-5Ti-1B master alloy； modification； damping capacity； damping mechanism
Abstract: The modification mechanism and damping capacity of conventional as-cast ZA27 alloy modified by Al-5Ti-1B master alloy were investigated. The cantilever beam technique was used for the measurement of damping capacity. As the experimental results showed, the commercial Al-5Ti-1B master alloy is a powerful modifier, it can decrease the grain size of Al-rich primaryαphase greatly and transform its dendritic structure to a fine petal-like one. Meanwhile, it can improve the damping capacity greatly, and the best modification effect and highest damping capacity can be obtained at 0.088% Ti content. It is believed that Ti(Al,Zn)3, TiAl3, TiB2are effective nucleators to ZA27 alloy, the damping mechanism of ZA27 alloy is associated with the viscous sliding or slipping of the grain boundaries and phase interfaces. The more the grain boundaries and interfaces, the higher the damping capacity of ZA27 alloy can be obtained.
