摘要
对铸态ZA27合金在250℃进行了挤压比为7的热挤压,利用多功能内耗仪测试合金的阻尼。结果表明,挤压ZA27合金的阻尼随着温度升高而升高,随频率增大而减小,与应变振幅无关。挤压可提高合金阻尼,温度越高,提高幅度越明显。如25℃时挤压可使合金阻尼提高17%,而145℃时则提高了44%。热挤压使ZA27合金晶粒细化,位错增多,从而提高了合金阻尼。
The damping behaviors of hot extruded ZA27 alloy were studied by means of a multifunction internal friction apparatus. The experimental results showed that the damping capacities of the alloy increase with increasing of temperature or decreasing of vibrate frequency, whereas vibration amplitude has no marked influence on the damping level in this alloy at the range of vibration amplitude. Hot extrusion can improve damping capacities of as-cast ZA27 alloy. With increasing the temperature, the damping capacities of the hot extruded ZA27 alloy increases rapidly than that of the as-cast ZA27 alloy. For example, the damping capacities of hot extruded ZA27 alloy are respectively higher for 17 percent at 25°C and 44 percent at 145°C than that of as-cast ZA27 alloy. The hot extruded ZA27 alloy has more grain interfaces and higher dislocation densities than as-cast ZA27 alloy, so it possesses higher damping capacities than as-cast ZA27 alloy.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2005年第4期529-531,共3页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50075068)
航空科学基金资助项目(02G53052)
凝固技术国家重点实验室资助项目(200401)
关键词
ZA27合金
挤压
阻尼
Aluminum alloys
Damping
Dislocations (crystals)
Grain boundaries
Internal friction
Machine vibrations
Metal extrusion
