| Numéro |
J. Phys. Colloques
Volume 46, Numéro C10, Décembre 1985
Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids
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| Page(s) | C10-375 - C10-378 | |
| DOI | https://doi.org/10.1051/jphyscol:19851084 | |
J. Phys. Colloques 46 (1985) C10-375-C10-378
DOI: 10.1051/jphyscol:19851084
INTERNAL FRICTION DAMPING IN A RAPIDLY SOLIDIFIED Al-Fe-Ce POWDER METALLURGY ALLOY
R.A. WINHOLTZ and W.N. WeinsDepartment of Mechanical Engineering, University of Nebraska, Lincoln, Nebraska 68588-0525, U.S.A.
Abstract
The low frequency internal friction behavior of a rapidly solidified Al-8.6Fe-3.8Ce powder metallurgy alloy was investigated over the temperature range of 77 K to 700 K and frequency range of .6 to 1.5 Hz. The alloy has a large high temperature background damping curve as well as a small internal friction peak at about 475 K with an activation energy of 150 KJ/mole (36 kcal/mole) which is believed to be related to a grain boundary relaxation phenomenon. Aging of this alloy for up to 100 hours at 400°C increases the magnitude of both the high temperature background and the 475 K peak as well as causing another possible peak to appear. These aging effects as well as changes in modulus as calculated from measured frequency changes are discussed and possible mechanisms are proposed.