Abstract
The damping capacity of Co-Mn system which undergoes fcc → hcp martensitic transformation has been studied as a function of e volume fraction using an inverted torsional pendulum. The damping capacity increases linearly with increasing e volume fraction regardless of manganese content, and is represented by δ = 0.05 + 0.27 f e where δ is the damping capacity in logarithmic decrement of Co-Mn system and f e is the e volume fraction. The main damping mechanism of Co-Mn system containing e martensite is the movement of stacking fault boundaries in e martensite plates.
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