Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1574357 | Materials Science and Engineering: A | 2015 | 10 Pages |
Abstract
Shape memory alloys (SMAs) have attracted considerable attention for their high damping capacities. Here we investigate the damping behavior of Ti50(Pd50âxDx) SMAs (D=Fe, Co, Mn, V) by dynamic mechanical analysis. We find that these alloys show remarkably similar damping behavior. There exists a sharp damping peak associated with the B2-B19 martensitic transformation and a high damping plateau (Qâ1~0.02-0.05) over a wide ambient-temperature range (220-420Â K) due to the hysteretic twin boundary motion. After doping hydrogen into the above alloys, a new relaxation-type damping peak appears in the martensite phase over 270-360Â K. Such a peak is considered to originate from the interaction of hydrogen atoms with twin boundaries and the corresponding damping capacity (Qâ1~0.05-0.09) is enhanced by roughly twice that of the damping plateau for each alloy. Moreover, the relaxation peaks are at higher temperatures for the TiPd-based alloys (270-370Â K) than for the TiNi-based alloys (190-260Â K). We discuss the influence of hydrogen diffusion, mobility of twin boundaries and hydrogen-twin boundary interaction on the temperature range of the relaxation peak. Our results suggest that a martensite, with appropriate values for twinning shear and hydrogen doping level, provides a route towards developing high damping SMAs for applications in desired temperature ranges.
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Authors
Dezhen Xue, Yumei Zhou, Xiangdong Ding, Kazuhiro Otsuka, Turab Lookman, Jun Sun, Xiaobing Ren,