2aPAb14. Ultrasonic velocity and attenuation of nano-scaled copper measured by laser ultrasonic technique.

Session: Tuesday Morning, May 14

Time: 12:00

Author: Xiaorong Zhang
Author: Changming Gan
Author: Shiyi Zhang
Location: State Key Lab. of Modern Acoust. and Inst. of Acoust., Nanjing Univ., Nanjing 210093, China
Author: Yuying Hauny
Author: Dingchang Xian
Location: Lab. of Synchrotron Radiation, Inst. of High Energy Phys., Chinese Acad. of Science, Beijing 100039, China


The velocity and attenuation of an ultrasonic longitudinal wave for nano-scaled copper are determined by a laser ultrasonic technique. The nano-scaled copper samples are composed of super fine particles 10-nm in size, and are prepared by a suppressing and sintering technique under a vacuum, and different pressures are used in the experiment. These samples are of thicknesses between 125--300 (mu)m. The experimental results show that the velocity dispersions and attenuation spectra of nano-scaled copper depend on their fabrication technology conditions, which are different from those of conventional Cu. The attenuation of nano-scaled copper is proportional to the frequency of ultrasound, and some absorption peaks appear at the curves of attenuation versus frequency, but the attenuation of conventional Cu is proportional to the square of the frequency. The velocity of nano-scaled copper is lower than that of conventional Cu. The experimental system, measurement method, results, analyses and discussions are also presented.

from ASA 131st Meeting, Indianapolis, May 1996