Fifth European Symposium on Martensitic Transformations and Shape Memory Alloys

J. Phys. IV France 11 (2001) Pr8-75-Pr8-79
DOI: 10.1051/jp4:2001813

30 MHz ultrasonic attenuation of TiNi single crystal associated with B2-B19' martensitic transformation and twin boundaries

X. Ren¹, X.L. Liang², K. Otsuka³, T. Suzuki⁴, H.M. Shen² and Y.N. Wang<sup>2

1</sup>  Materials Physics Group, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
²  Department of Physics, Nanjing University, Nanjing, China
³  Smart Structure Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
⁴  Tsukuba Institute of Science and Technology, Tsukuba, Japan

Abstract
Ultrasonic attenuation was measured for the first time at megahertz range (30MHz) for a TiNi single crystal, which undergoes B2-B19' (cubic-monoclinic) martensitic transformation. A sharp attenuation peak was found at transformation temperature region (two-phase region), which was associated with the structural transformation and drastic domain wall evolution in the two-phase region. Besides, a very broad peak below the transformation temperature (i.e., in martensite state) was also found, which can be ascribed to twin boundary motion at megahertz range. This broad peak has a high internal friction level of 0.0027. Considering that this alloy also has a high damping capacity at low frequency, we can deduce that TiNi martensite is an excellent high damping material in an extremely wide frequency range and wide temperature range.

© EDP Sciences 2001