Evaluation of the functional properties of NiTi shape memory alloys by structural parameters of the austenite phase

Teodor M. Breczko; Krzysztof Kus

doi:10.1117/12.517982

10 October 2003 Evaluation of the functional properties of NiTi shape memory alloys by structural parameters of the austenite phase

Teodor M. Breczko, Krzysztof Kus

Author Affiliations +

Proceedings Volume 5127, Sixth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering; (2003) https://doi.org/10.1117/12.517982
Event: Sixth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, 2002, St. Petersburg, Russian Federation

Abstract

Structural characteristics of the austenite phase of a NiTi shape memory alloy (SMA) subjected to thermo-mechanical cycling under a constant applied load were studied. Progressive thermo-mechanical action of the external deformation results in both changes of the defect structure and, macroscopically, in memory shape effect degradation. The study was performed using the x-ray method of analysis. Two parameters have been determined to study the evolution of the austenite phase: root-mean-square (RMS) microstrains and coherent block size. the number of thermoa-mechanical loading cycles was varied either from 50 to 400 (for series) or from 1 to 5 for preliminary estimates. Experimental results show that the loading process depends on the changes in the structural cahracteristics. On this basis we propose some structural parameters helpful in the prediction of the memory shape effect degradation in the actuated SMA materials.

Citation Download Citation

Teodor M. Breczko and Krzysztof Kus "Evaluation of the functional properties of NiTi shape memory alloys by structural parameters of the austenite phase", Proc. SPIE 5127, Sixth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, (10 October 2003); https://doi.org/10.1117/12.517982

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