期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.02.058
关键词
Shape memory alloys; Internal friction; Hydrogen; Twin boundary; Twinning shear
类别
资金
- National Basic Research Program of China [2012CB619401]
- National Natural Science Foundation of China [51201126, 51302209, 51320105014, 51431007, 51321003]
- 111 project of China [B06025]
- LDRD program at Los ALamos National Laboratory
- Grants-in-Aid for Scientific Research [26289245] Funding Source: KAKEN
Shape memory alloys (SMAs) have attracted considerable attention for their high damping capacities. Here we investigate the damping behavior of Ti-50(Pd50-xDx) 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 (Q(-1) similar to 0.02-0.05) over a wide ambient-temperature range (220-420 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 270-360 K. Such a peak is considered to originate from the interaction of hydrogen atoms with twin boundaries and the corresponding damping capacity (Q(-1) similar to 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 (270-370 K) than for the TiNi-based alloys (190-260 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. (C) 2015 Elsevier B.V. All rights reserved.
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