Abstract
Fe-Ni-Mn alloys having appropriate value of stacking fault energy possess good damping characteristics at plastically deformed conditions.
5 types of the alloys containing 37 wt%Ni and 1115 wt%Mn were investigated with an intention of development of high damping ferrous materials. A transversal vibration method was used to examine their characteristics evaluated by a logarithmic decrement δ.
For a Fe-5 wt%Ni-15 wt%Mn alloy deformed by 15%, the highest δ, 1×10-2, was obtained at 4×10-5 as the maximun strain amplitude. The value is not enough for the practical use, but is was expected that the alloys would have more high damping potentials from the fact that the δ has been remarkably increased with increasing of strain amplitude on the specimen. Because of an unsufficient power of the apparatus used here, experiments were limited to a very small range of amplitude.
A model is proposed for the mechanism of energy consumption in the alloy where recombination of half dislocations to a perfect one is caused at the intersection of two different slip planes during vibration and vice versa.
