The damping capacity of the Fe- 12 mass percent Cr-6 to 30 mass percent Mn alloys has been investigated. Particularly the effects of microstructure composed of the phases of #alpha#, #alpha#', #gamma#, and #epsilon# on the damping capacity have been clarified. Various fraction of these phases were formed depending on the Mn content and cold work degree. The combination of 22 mass percent Mn and 50 percent cold rolling formed the largest volume fraction of e martensite and showed the highest damping capacity. The other phases of #alpha#, #alpha#' and #gamma# had very small effect on the increasing of damping capacity.
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