Fig. 1 Microstructures of quenched Ni44Fe19Ga27Co10 a, b and Ni39Fe19Ga27Co15 c, d single crystals: a, c—bright-field images and corresponding SADPs, matrix zone axis is [011]L21; b, d—dark-field images in < 111 >  L21 reflections

Fig. 2 σ(ε) response for quenched Ni44Fe19Ga27Co10 a and Ni39Fe19Ga27Co15 b crystals

Fig. 3 Temperature dependences of stress hysteresis a and critical stress b for quenched Ni44Fe19Ga27Co10 and Ni39Fe19Ga27Co15 single crystals. The circles indicate the conditions for cyclic tests

Fig. 4 σ(ε) response during 1-100 cycles for quenched Ni44Fe19Ga27Co10 a and Ni39Fe19Ga27Co15 b single crystals

Fig. 5 Dependences of critical stress σcr a, d of stress hysteresis Δσ b, e and strain hardening coefficient θ = dσ/dε c, f on the number of cycles for quenched Ni44Fe19Ga27Co10 a-c and Ni39Fe19Ga27Co15 d-f single crystals

Fig. 6 Estimation of elastic energy ΔGrev a, dissipated energy ΔGirr b and their ratio ΔGrev/ΔGirr c

Fig. 7 ε(T) curves before and after cyclic tests for quenched Ni44Fe19Ga27Co10 (100 cycles) and Ni39Fe19Ga27Co15 (18 cycles) single crystals

Fig. 8 σ(ε) response during cycling for quenched Ni44Fe19Ga27Co10 a and Ni39Fe19Ga27Co15 b single crystals at 298 K

Fig. 9 σ(ε) curves under compressive load for quenched Ni44Fe19Ga27Co10 and Ni39Fe19Ga27Co15 single crystals demonstrating the yield strength of L10-martensite at temperatures of 213 K and 373 K

Fig. 10 Optical metallography of the surface after 18 loading/unloading cycles a and after 25 cycles b; fractography of the fracture surface after 29 cycles c, d in Ni39Fe19Ga27Co15 single crystals, cycling temperature 203 K