Abstract
A study was carried out of the effect of crystal structure on the two-way shape memory effect (TWSME) and its cyclic stability using ferromagnetic single crystals of the Co49Ni21Ga30 alloy (at %), oriented along the [001]-direction, after quenching (T = 1423 K, 0.5 h) and stress-free ageing (T = 623 K for 3 h). The TWSME in [001]-oriented single crystals of the Co49Ni21Ga30 alloy was manifested after training of samples during implementation of B2-L10 martensitic transformation (MT) in the cooling/heating cycle, with constant external stress |σext|. The value of the TWSME was found to depend on the structure of the crystals and the level of applied stress during training. The maximum TWSME value (εTWSME = –4.3(±0.2)%) was achieved after training at |σext| = 125 MPa in single-phase crystals and was equal to lattice deformation ε0 in MT for [001]-oriented single crystals under compression. Ageing lead to a decrease in the TWSME value compared with the single-phase state in three times. In [001]-oriented single crystals with γ′-phase particles, the value of TWSME εTWSME, the temperature hysteresis ΔTTWSME, and the start temperature of the forward MT Ms remained unchanged for 500 cycles, and in quenched crystals, up to 150 cycles.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
