The shape memory effect (SME) and superelasticity (SE) behavior of homogenized Co35Ni35Al30 single crystals were systematically characterized along the ,  and  orientations under compression. The shape memory behavior of CoNiAl was found to be highly orientation and stress/temperature dependent. Maximum compressive recoverable strains were 3.98 % in , 3 % in  and 0.30 % in  orientations, respectively. The Co35Ni35Al30 demonstrated a very high superelastic temperature window of more than 350 °C along the  and  orientations. Moreover, two-way shape memory effect with very low thermal hysteresis of about 6 °C was observed along the  orientation. The large decrease of recoverable strain and hysteresis with stress (or temperature) was mainly attributed to the difference of elastic moduli of transforming phases.
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This work was supported in part by the KSEF-148-502-15-355 and NSF CMMI-1538665 programs.
Li, Peizhen; Karaca, Haluk E.; and Chumlyakov, Yury I., "Orientation Dependent Compression Behavior of Co35Ni35Al30 Single Crystals" (2017). Mechanical Engineering Faculty Publications. 59.