Abstract
The work focuses on stress-induced transformation in single crystal NiTi alloys. Many of the basic features of these alloys are known but there are still a number of concepts that have not been fully understood and require further clarification. In this short paper, we focus on four issues, namely tension-compression asymmetry, crystal orientation effects on stress-strain response, the role of precipitates on transformation and slip resistance and elastic moduli measurements on austenite, martensite and the two-phase microstructure. We show that coherent precipitates lower the transformation stress at small strains while increasing the slip resistance of austenite and martensite domains at higher strains. Based on the resolved shear stress factors (RSSF), we identify hard and soft orientations explaining tension-compression asymmetry and crystal orientation dependence. Also, we note that the martensite modulus is significantly higher than the austenite modulus for the single crystal orientations studied.
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