摘要
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。
Effects of heat treatment temperature（TH） and heat treatment time（tH） on damping capacity of Mg-6Zn-3Cu-0.6Zr alloy were investigated using SEM,EDS and dynamic mechanical analyzer（DMA）.The results show that with increasing the heat treatment temperature,grains of the alloy grow up,the amount of eutectic phase at grain boundaries decreases and the damping capacity increases.The amount of eutectic phase decreases,more granular precipitates are observed and the damping performance is improved with increasing heat treatment time for the alloy heat-treated at 300 ℃.After heat treatment at 400 ℃ for 2 h,the best damping capacity is obtained,which is more than twice damping capacity of as-cast alloy.Influences of different heat treatment processes on damping properties of the magnesium alloy are explained by the G-L theory.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2011年第5期6-10,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金委员会和中国工程物理研究院联合基金(11076019)
