摘要
利用多功能内耗仪对空气加压渗流法制备的通孔多孔铝的阻尼行为进行了研究,在20-400℃的温度范围内,在三个离散的低频率0.5,1.0和3.0 Hz下对试样的内耗和相对动力学模量进行了测量。结果表明：在多孔铝中宏观孔的大小是毫米量级,孔隙率达69%;在多孔铝试样的温度-内耗曲线上观察到了一个内耗峰,伴随着内耗峰的出现模量明显减小,该内耗峰的平均激活能为（1.39±0.03）eV。此内耗峰的机制为位错亚结构与晶界的相互作用导致晶界的粘性滑移受到限制造成的。
The damping behavior of commercially pure porous aluminum （FA） was investigated. The internal friction （IF） and relative dynamic modulus were measured at frequencies of 0. 5, 1. 0 and 3. 0 Hz over the temperature range of 20-400 ℃. The size of macroscopic pore is 1.0 mm and in large proportions up to 69 vol%. The measured IF show that the damping capacity of FA is enhanced in comparison with commercially pure bulk aluminum. Especially, an IF peak is found and corresponding to a rapid drop of relative dynamic modulus （vs temperature） in the FA specimen. The average value for the activation energy of the IF peak is （1. 395：0. 03） eV. TEM observations show that dislocation substructures exist near the grain boundaries. Accordingly. The intersecting of such substructures with grain boundaries result in the limittion of sliding process during the viscous sliding of the boundary.
出处
《机械工程材料》
CAS
CSCD
北大核心
2007年第1期43-46,共4页
Materials For Mechanical Engineering
基金
江西省自然科学基金资助项目(0550050)
江西省教育厅科研资助项目(13-3-B-04)
关键词
通孔多孔铝
阻尼
内耗
低频
porous aluminum
damping behavior
internal friction
low frequency
