摘要
用喷雾沉积快速凝固技术制备了含硅 4 %的ZA2 7合金 ,并对其进行了热挤压。采用多功能内耗仪测试合金挤压前后的阻尼性能。结果表明 ,喷雾沉积ZA2 7 4 %Si合金挤压前后的阻尼性能随着温度升高而升高 ,随频率增大而减小 ,与应变振幅无关。与喷雾沉积态相比 ,挤压对合金室温阻尼影响不大 ,但在高于 5 0℃时可提高合金阻尼。如 10 5℃时 ,合金的阻尼可达 5 0 7× 10 - 2 ,比未挤压前相比提高了近 2 0 %。合金阻尼可用传统的界面阻尼理论和位错阻尼理论解释。
ZA27 alloy doped with 4% Si (named ZA27-4%Si ) was prepared by spray deposition technique, and then the alloy was hot extruded at 250°C. The damping behaviors of the alloy un-extruded and un-extruded were investigated using a multifunction internal friction apparatus. The experimental results show that the damping capacities of the alloy increase with decrease of vibrate frequency and increase of temperature, whereas vibration amplitude has no effect on the damping capacities of the alloy. Hot extrusion can improve damping capacity of the spray deposited ZA27-4%Si alloy above 50°C. For example, the damping capacity of the extruded spray deposited ZA27-4% Si alloy is 5.07 × 10-2 at 1 Hz and 105°C, which is higher 20% than that of the alloy un-extruded. The damping behaviors of the alloy can be explained with interface damping and dislocation damping mechanism.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2005年第1期28-31,共4页
Transactions of Materials and Heat Treatment
基金
航空科学基金 (0 2G530 52 )
教育部回国留学人员启动基金
凝固技术国家重点实验室开放课题资助项目
关键词
ZA27合金
喷雾沉积
挤压
阻尼
Damping
Extrusion
Microstructure
Sprayed coatings
Transmission electron microscopy
