Ambient-temperature high damping capacity in TiPd-based martensitic alloys

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:632

Article

Xue, Dezhen^1,3  Zhou, Yumei¹  Ding, Xiangdong¹  Otsuka, Kazuhiro²  Lookman, Turab³  Sun, Jun¹  Ren, Xiaobing^1,2 

[1] Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, Multidisciplinary Mat Res Ctr, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

[2] Natl Inst Mat Sci, Ferro Phys Grp, Tsukuba, Ibaraki 3050047, Japan

[3] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

关键词: Shape memory alloys;    Internal friction;    Hydrogen;    Twin boundary;    Twinning shear;   

DOI  :  10.1016/j.msea.2015.02.058

来源: Elsevier

【 摘 要 】

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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