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