高强阻尼铝合金的阻尼性能和组织稳定性

采用时效处理实验,研究了快速凝固/粉末冶金工艺制备的X7093/5(Zn-30Al)高强度阻尼铝合金的阻尼性能和组织稳定性.将阻尼铝合金分别在50℃,100℃,120℃保温10?h,50?h,100?h后空冷,采用动态力学热分析仪(DMTA)和透射电镜(TEM)分别测试其阻尼性能和观察微观组织的变化情况.研究结果表明: 阻尼铝合金在时效过程中,组织结构由最初细碎杂乱的晶态结构转变为具有规则晶界的大晶粒结构,晶界对合金阻尼性能的贡献增强.在室温至250℃的温度范围内,合金阻尼值由4×10^-3增至3.0×10^-2.阻尼铝合金在120℃以下、100?h以内的时效处理中,时效温度和时效时间的不同对合金阻尼性能的影响不显著,材料的阻尼性能稳定性良好.

Stability on the damping capacity and microstructure of the high strength damping aluminum alloy

The stability on the damping capacity and microstructure of the X7093/5(Zn-30Al) high strength aluminum alloy prepared by rapid solidification and powder metallurgy process was investigated with aging treatment. The alloy was aged at 50℃,100℃,120℃ for 10?h,50?h,100?h separately and then air cooled. The damping capacity and microstructure variation was tested with dynamic mechanical thermal analysis(DMTA) and transmission electron microscope(TEM). The result shows that the microstructure of the alloy changed from fine crystals to large crystals with regular and sharp grain boundaries, the effect of grain boundaries on the damping capacity increased. From room temperature to 250℃, the damping capacity increased from 4×10^-3 to 3.0×10^-2. Aging time and temperature do not have significant effect on the damping capacity below 120℃ and 100?h and the alloy kept excellent stability.