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Issue J. Phys. Colloques
Volume 46, Number C10, Décembre 1985
Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids
Page(s) C10-409 - C10-412
DOI http://dx.doi.org/10.1051/jphyscol:19851092

Eighth International Conference on Internal Friction and Ultrasonic Attenuation in Solids

J. Phys. Colloques 46 (1985) C10-409-C10-412
DOI: 10.1051/jphyscol:19851092

INTERNAL FRICTION IN SONOSTON - A HIGH DAMPING Mn/Cu-BASED ALLOY FOR MARINE PROPELLER APPLICATIONS

I.G. RITCHIE1, K.W. SPRUNGMANN1 and M. SAHOO2

1  Atomic Energy of Canada Limited, Whiteshell Nuclear Research Establishment, Pinawa, Manitoba, Canada R0E 1L0
2  Physical Metallurgy Research Laboratories, CANMET/EMR, Ottawa, Ontario, Canada K1A 0G1


Résumé
On compare les changements dûs au frottement interne et au module de Young, dans l'éventail de température de 10 à 600°C, sur des échantillons coulés en laboratoire à partir du SONOSTON, un alliage binaire de Mn-Cu, et les échantillons prélevés d'une pale d'hélice de SONOSTON. L'état de frottement interne élevé, à la température ambiante, du SONOSTON dépend fortement de l'amplitude et les résultats obtenus sont semblables à ceux observés chez les alliages ferromagnétiques. On observe, chez le SONOSTON, un pic de relaxation ainsi que chez l'alliage binaire de Mn/Cu à ~ 400°C. Le pic de relaxation de 400°C est probablement une relaxation du type Zener mettant en jeu un arrangement ordonné régulier des atomes de Mn dû aux contraintes.


Abstract
Internal friction and Young's modulus changes over the range 10 to 600° C in laboratory cast samples of SONOSTON, a binary Mn-Cu alloy and samples cut from a 200-kg propeller blade cast from SONOSTON are compared. The high-damping state at room temperature in SONOSTON is very amplitude dependent, and the results are similar to those observed in ferromagnetic high-damping alloys. Besides the high-damping peak close to room temperature, there is a major relaxation peak in SONOSTON and in the binary Mn/Cu alloy at ~ 400°C. The 400°C peak is probably a Zener-type relaxation involving the stress-induced ordering of Mn atoms.





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