High damping capacity in a wide ambient-temperature range in hydrogen-doped and hydrogen-free Ti-45Pd-5Cr martensitic alloy

Alloys exhibiting high damping capacity in ambient-temperature range (250-400 K) are rare. Here it is reported that a martensitic alloy Ti-45Pd-5Cr shows twin-boundary-related high damping capacity over this temperature range. In the hydrogen-doped martensitic state, a relaxation-type high damping peak (Q(-1) approximate to 0.09) exists, extending over 305-370 K. In the hydrogen-free martensitic state, there is a fascinating high-damping plateau (Q(-1) approximate to 0.05) over 250-450 K. This work provides new insight into how to develop high damping alloys for the desired temperature range. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.