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采用扫描电镜(SEM)及能谱仪(EDS)、动态机械分析仪(DMA)研究了热处理温度和热处理时间对Mg-6Zn-3Cu-0.6Zr合金显微组织和阻尼性能的影响。结果表明:随着热处理温度升高,合金晶粒长大,晶界共晶体减少,合金阻尼性能提高;300℃热处理时,保温时间越长,晶界共晶体越少,晶内微小点状析出物越多,合金阻尼性能越好;当热处理工艺为400℃保温2 h时,合金阻尼性能最好,与铸态相比,其阻尼性能的提高超过一倍。不同热处理工艺对合金阻尼性能的影响规律可用G-L理论来解释。
The effects of heat treatment temperature and heat treatment time on microstructure and damping properties of Mg-6Zn-3Cu-0.6Zr alloy were investigated by scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and dynamic mechanical analyzer (DMA) The results show that as the heat treatment temperature increases, the grain size increases, the grain boundary eutectic decreases, and the damping properties of the alloy increase. When the heat treatment time is longer than 300 ℃, The better the damping property, the better the damping property of the alloy is. When the heat treatment process is 400 ℃ for 2 h, the damping property of the alloy is the best. Compared with the as-cast state, the damping performance of the alloy is more than doubled. The effects of different heat treatment processes on damping properties of alloys can be explained by G-L theory.