Title :
Ultrasonic attenuation peak during fatigue test of pure copper observed with electromagnetic acoustic resonance (EMAR)
Author :
Hirao, M. ; Ogi, H. ; Suzuki, N. ; Ohtani, T.
Author_Institution :
Grad. Sch. of Eng. Sci., Osaka Univ., Japan
Abstract :
Method of electromagnetic acoustic resonance (EMAR) has been applied to in situ monitoring of the microstructural change of polycrystalline copper in fatigue test. Continuous measurement of resonant frequency and attenuation coefficient reveals that the overall microstructural changes occur in a short interval between 20 and 30% of the total life. Ultrasonic measurement is interpreted in terms of dislocation mobility and rearrangement, which is supported by the replication and TEM observations
Keywords :
acoustic resonance; copper; crystal microstructure; dislocation motion; fatigue testing; ultrasonic absorption; ultrasonic materials testing; ultrasonic measurement; Cu; TEM observations; attenuation coefficient; dislocation mobility; electromagnetic acoustic resonance; fatigue test; in situ monitoring; microstructural change; microstructural changes; polycrystalline Cu; rearrangement; resonant frequency; ultrasonic attenuation peak; ultrasonic measurement; Acoustic measurements; Acoustic testing; Attenuation measurement; Copper; Electromagnetic measurements; Fatigue; Frequency measurement; Monitoring; Resonance; Ultrasonic variables measurement;
Conference_Titel :
Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE
Conference_Location :
Sendai
Print_ISBN :
0-7803-4095-7
DOI :
10.1109/ULTSYM.1998.762273
