Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. IV France 06 (1996) C8-829-C8-832
Ultralow Temperature Anelasticity of Aluminum-Magnesium AlloysW. Duffy Jr.
Department of Physics, Santa Clara University, Santa Clara, CA-95053, U.S.A.
Results of internal friction measurements on the commercial aluminum-magnesium alloys 5052, 5086 and 5486 are reported here over the temperature range 50 mK to 300 K, and compared with published data on alloy 5056. Effects of heat treatment and explosive bonds on the internal friction are evaluated. The quality factor of proposed multi-layer aluminum-alloy spherical resonant-mass detectors of gravity waves is shown to be seriously degraded, if layer interfaces exhibit large-amplitude wavy explosive bonds. Shear modulus variations from 50 mK to 10 K are obtained from high-resolution frequency measurements.
© EDP Sciences 1996