Abstract. Due to their promising mechanical characteristics, copper-based shape memory alloys (SMAs) are crucial for numerous applications. This research inspects the outcomes of various quantities (0.4%, 0.8%, and 1.2% wt) of boron (B) additions on the resistance against corrosion and the microstructure of Cu-Al-Ni SMAs using SEM, EDS, XRD, and electrochemical tests in a solution of 3.5% NaCl. Numerous measurement baths were used for aged / unaged Cu-Al-Ni-xB SMAs. The electrochemical tests were performed over several periods to confirm the reliability of the corrosion-resistance property, after which the samples were verified using solutions of 3.5% NaCl. The experimental results demonstrated that adding 1.2% wt B followed by an aging process resulted in an improvement in the corrosion resistance in Cu-Al-Ni SMAs and a decrease in the corrosion rate by 58%.

Conclusion Sintering samples at 550 ? C for 120 minutes and 950 ? C for 180 minutes (with and without 0.4%, 0.8%, and 1.2% wt B) was an efficient method of preparing Cu-Al-Ni alloy structures. The sintered samples were heated at 850 ? C for 60 minutes, rapidly immersed in iced water, heated to 300 ? C for 1800 minutes, and put in the water again to age the intermetallic compound ( 2) and stabilize the martensite phase. The aging of Cu Al-Ni SMAs was enough to get ?? (coarse, martensite plate-like) and ?? (needle-like shape), whereas the B addition to Cu-Al-Ni SMA tended to refine ?? (coarse martensite plate-like). The electrochemical test displayed that the corrosion rate decreased from 14.95 mpy to 2.27 mpy when 1.2% wt B was added. Therefore, we conclude that an increase in boron leads to an improvement in the resistance of Cu-Al-Ni SMAs against corrosion.