Effect of Compression on the Crystallization Behavior and Corrosion Resistance of Al86Ni9La5 Amorphous Alloy

The effect of compression on the crystallization behavior and corrosion resistance of Al86Ni9La5 amorphous ribbons was investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and electrochemistry test. The XRD and TEM results reveal that the compressed Al86Ni9La5 ribbons spun with the circumferential speed (R) of 29.3 m/s are in fully amorphous state; however, the compressed ribbons spun with R=14.7 m/s have crystalline phases embedded in the amorphous matrix. The SEM images indicate that after compression, the toughness of the ribbons increases. Electrochemical results show that the compression decreases the stability of the passive film of the Al86Ni9La5 amorphous ribbons, because of the compression-introduced free volume, shear bands and crystalline phases; meanwhile, with R=14.7 m/s, the compression-induced crystalline phases in the Al86Ni9La5 ribbons increase the corrosion potential.