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01.06.2015 | Ausgabe 2/2015

Shape Memory and Superelasticity 2/2015

Local Evolution of the Elastocaloric Effect in TiNi-Based Films

Shape Memory and Superelasticity > Ausgabe 2/2015
H. Ossmer, C. Chluba, M. Gueltig, E. Quandt, M. Kohl


Strain and temperature profiles of magnetron-sputtered ferroelastic TiNi-based films of 20 μm thickness are investigated during tensile load cycling with respect to strain, strain rate, and cycle number in order to assess their potential for elastocaloric cooling. Two different ferroelastic film specimens are considered, binary TiNi and quaternary TiNiCuCo films, which strongly differ regarding their phase transformation hysteresis and fatigue behavior. In situ digital image correlation and infrared thermography measurements reveal a correlated response of strain and temperature bands that is determined by mesoscale stress and temperature fields on the kinetics of phase transformation. In the case of binary TiNi films, this response is also strongly affected by cycling-induced fatigue causing vanishing band formation and decreasing elastocaloric effect size. In contrast, TiNiCuCo films show negligible fatigue and retain the local characteristics of the elastocaloric effect. Compared to TiNi films, they exhibit not only a reduced temperature change, but also a reduced work input for pseudoelastic cycling resulting in an improved material’s coefficient of performance of 15.

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