The influence of ultrasound on shape memory behavior

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 481; pp. 620 - 622
• Main Authors: Rubanik, V.V., Klubovich, V.V.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25-05-2008
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2007.02.134

The ability of ultrasonic vibrations (UVs) to influence the thermo-elastic phase transformation in TiNi alloys has been reported earlier. Particularly it was shown that preliminary ultrasound influence changes characteristic temperatures and transformation kinetics. Also UVs allow to realize a “sliding” shape memory effect (SME) when the reverse transformation occurs in certain areas. In the present paper it is shown that UVs determine a reversion of storage deformation at the temperature range of direct and reverse transformation of TiNi. UVs allow forming small thermal–mechanical hysteresis loops in the temperature range
M
s–
M
f. Besides UVs can initiate SME in full measure. At the same time the austenite finish temperature
A
f is reduced. On the whole the SME initiation with the help of UVs is caused by thermal as well as power effects.