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Large Anhysteretic Deformation of Shape Memory Alloys at Postcritical Temperatures and Stresses [in press]

Chernenko, Volodymyr A.; L'vov, Victor A.; Kabra, Saurabh; Aseguinolaza, Ivan R.; Kohl, Manfred; Hosoda, Hideki; Barandiaran, Jose M.

Abstract (englisch):
Magnetic and nonmagnetic shape memory alloys (SMAs) exhibit thermoelastic martensitic transformations (MTs) which are hysteretic due to their first-order nature. According to the thermodynamic Landau theory of phase transitions, which assumes ideal thermoelastic equilibrium at each point of the MT interval, the hysteresis is explained by the different limits of stability for austenite and martensite in the phase diagram. No interactions on the phase boundaries are taken into account. In the real alloys, the hysteresis of MT is related not only to the stability intervals of two phases but also to the processes of nucleation and growth of the resultant phase inside the parent phase. In turn, the features of these processes are related to the heights of energy barriers caused by the incompatibility of austenitic and martensitic lattices, crystal defects and some other physical factors. However, the defects, normally, play a minor role in the width of MT hysteresis if compared to the thermodynamic and crystallographic factors. A reduction of hysteresis of MT in SMAs, being crucial for technology, presents a challenging problem for scien ... mehr

Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.1002/pssb.201700273
ISSN: 0370-1972, 1521-3951
KITopen ID: 1000073662
HGF-Programm 43.22.01; LK 01
Erschienen in Physica status solidi / B
Seiten 1700273
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