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Proceedings Paper

Evaluation of the functional properties of NiTi shape memory alloys by structural parameters of the austenite phase
Author(s): Teodor M. Breczko; Krzysztof Kus
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Paper 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.

Paper Details

Date Published: 10 October 2003
PDF: 7 pages
Proc. SPIE 5127, Sixth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering, (10 October 2003); doi: 10.1117/12.517982
Show Author Affiliations
Teodor M. Breczko, Univ. Warminsko-Mazurski (Poland)
Krzysztof Kus, Univ. Warminsko-Mazurski (Poland)


Published in SPIE Proceedings Vol. 5127:
Sixth International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering
Alexander I. Melker, Editor(s)

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