The Effect of Ceo2 Addition on Transformation Temperatures and Wear Resistance of Cu-Al-Ni Shape Memory Alloys


SMAs can switch from one crystallographic structure to another in response totemperature or stress stimuli. When SMAs are exposed to mechanical cyclicstress, they can absorb and discharge mechanical energy by experiencing areversible hysteretic shape change. SMAs are widely used for sensing, actuation,impact absorption, and vibration damping. This work studied the effect of CeO2addition on the transformation temperature and wear resistance of Cu-Al-NiSMAs. WhereCeO2 was added at different percent’s 0.5, 1, and 3 wt% to thebase alloy, followed by casting and homogenization at 900oC. Some tests werecarried out: Differential scanning calorimeter, Optical Microscope, ScanningElectron microscopy, Energy dispersion spectrometer, X-Ray Diffraction, andWear and Hardness tests. OM and SEM tests reveal that both phases ofmartensite β and γ are found. Also, the additions of CeO2 show a visible effect onphase formation and transformation temperatures. It was observed that increasingof CeO2 particles in Cu-based SMAs owing to improve interfacial bondingbetween matrix and reinforcement and also observed that the variants becomethicker with increasing in percent. Additions of different percentages of ceriumoxide increase the hardness of Cu-Al-Ni SMAs. Due to the addition of CeO2particles, the sample's wear rate decreases compared to pure SMAs.