Abstract
A distinct hump peak was observed at the scattering angle 2 θ ≈ 44° in the X-ray diffraction (XRD) pattern of rapidly quenched amorphous Al 87Co 10Ce 3 alloy. From the XRD patterns of amorphous Al–Co–Ce alloys with different compositions, it is found that the intensity of the hump peak increases as the Co/Ce atomic ratio increases, while the prepeak which characterizes the medium-range order (MRO) becomes weak. The hump peak has a close relationship with the glass forming ability in the Al–Co–Ce system. Furthermore, the crystallization behavior of Al 87Co 10Ce 3 alloy was investigated by the DSC and XRD methods. Compared with Al 87Ni 10Ce 3 alloy, Al 87Co 10Ce 3 alloy did not show a single process of grain growth for fcc-Al particle. The formation of a hump peak is presumed to be associated with the presence of pre-existing nuclei of fcc-Al and Co 2Al 9 in as-quenched amorphous Al 87Co 10Ce 3 alloy.
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