Shape recovery behavior under thermo-mechanical loads in TiNi alloys

Teodor Breczko; Krzysztof Kus

doi:10.1117/12.676715

9 June 2006 Shape recovery behavior under thermo-mechanical loads in TiNi alloys

Teodor Breczko, Krzysztof Kus

Proceedings Volume 6253, Ninth International Workshop on Nondestructive Testing and Computer Simulations; 62530I (2006) https://doi.org/10.1117/12.676715
Event: Ninth International Workshop on Nondestructive Testing and Computer Simulations, 2005, St. Petersburg, Russian Federation

Abstract

The measurements of shape memory effect of the Ti_50.08Ni_49.92 alloy were conducted by observing the progressive changes in shape recovery with increasing number of thermo-mechanical cycles. Two different thermo-mechanical protocols were studied using a bending apparatus. In the first one, the temperature cycling was performed under bending deformation for cooling and subsequent heating without external load. After each heating path the shape recovery was evaluated as a result of reverse transformation. In the second protocol the temperature cycling was executed under bending deformation both for cooling and heating. Here, the shape recovery was measured under load and as the load was released right after heating. The results for the second protocol showed that the degree of shape recovery decreases continuously with thermo-mechanical cycling while in the first protocol it is observed to be high almost stable. It was found that the changes in shape recovery behaviour depend on the nature of the transformation cycle, in particular, on whether a stress is applied during transformation. The reverse transformation in the second protocol occurred under load; therefore, such a loading process may inhibit to some extent the shape recovery by an uncompleted transformation (retained martensite). The results also suggested that the microstructural changes in the actuated material are more pronounced for the thermo-mechanical cycling where the load was maintained during both cooling and heating in comparison to the cycling with heating under no load.

Citation Download Citation

Teodor Breczko and Krzysztof Kus "Shape recovery behavior under thermo-mechanical loads in TiNi alloys", Proc. SPIE 6253, Ninth International Workshop on Nondestructive Testing and Computer Simulations, 62530I (9 June 2006); https://doi.org/10.1117/12.676715

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available