| Numéro |
J. Phys. Colloques
Volume 42, Numéro C5, Octobre 1981
ICIFUAS-7Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids |
|
|---|---|---|
| Page(s) | C5-641 - C5-646 | |
| DOI | https://doi.org/10.1051/jphyscol:1981598 | |
Seventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. Colloques 42 (1981) C5-641-C5-646
DOI: 10.1051/jphyscol:1981598
HIGH DAMPING CAPACITY OF Mn-BASE γ-PHASE ALLOYS
K. Ito, M. Kobayashi et M. TsukishimaDepartment of Metallurgy and Materials Science, Faculty of Engineering, University of Tokyo, 113 Bunkyo-ku, Tokyo, Japan
Abstract
The damping capacity as well as Young's modulus has been measured by flexural vibration (220-310Hz) as a function of temperature (125 - 370K) for (Mn1- XFeX) 0.95 Cu0. 05 (X = 0-146 - 0.279) and Mn1 - XNiX (X = 0.096 - 0.240) alloys quenched from the γ-phase state. The temperature dependence of axial ratio of the metastable γ-phase has been determined and some alloys have been further examined by torsional vibration (l.2-1.6Hz). Provided that the fct/fcc critical temperature is high enough, the alloys show high damping capacity(Q-1 = 0.01- 0.02) at 250-350K which consists of at least two peaks. They have both the character of the relaxtion type damping with the almost equal activation energy 5x104 J/mol. The damping behaviour of the examined alloys is essentially the same as known for Mn-Cu alloys.