摘要
多孔Mg是一种新型高阻尼材料,在被动阻尼及冲击防护等领域有广泛应用前景。采用内耗的方法对其阻尼行为进行了试验研究。结果表明,多孔Mg的阻尼性能比之致密Mg有明显提高,随孔隙率增加或孔径减小,提高的幅度增加。此外,在温度-内耗谱上还发现一弛豫型内耗峰,该峰的激活能和指数前因子分别为1.21eV和1.23×10-15,与位错的滑移有关。
Porous Mg is a novel high damping material to be widely used in engineering fields such as passive damping and impact protection etc. The damping behavior of a porous Mg was investigated through internal friction measurements in the present study. It is found that the damping capacity of the porous Mg is significantly higher than that of the corresponding bulk material and the enhancement increases with increasing the porosity or decreasing the pore size. Moreover, a relaxational internal friction peak was observed at the temperature spectra with an activation energy of 1.21 eV and a pre-exponential factor of 1.23×10^-15. It is believed to originate from the sliding of dislocations.
出处
《铸造》
EI
CAS
CSCD
北大核心
2006年第3期242-244,共3页
Foundry
关键词
多孔金属
MG合金
阻尼性能
内耗
porous metals
Mg alloys
damping capacity
internal friction
