Stability of the structure corresponding to the prepeak and amorphous Al90Tm5Ce5 alloys

The stability of amorphous Al90Fe5Ce5 and Al90Ni5Ce5 alloys and the stability of the structure corresponding to the prepeak during annealing process were investigated. Also the ageing effects of these alloys were investigated. Both the amorphous Al90Fe5Ce5 and Al90Ni5Ce5 alloys crystallize by two stages. The crystallization onset temperature for amorphous Al90Fe5Ce5 alloys is much higher than that of the amorphous Al90Ni5Ce5 alloys. The structure corresponding to the prepeak for amorphous Al90Fe5Ce5 alloys is stable. However, it is not stable for amorphous Al90Ni5Ce5 alloys, even decomposes at room temperature. By ageing effects, fcc Al is easily precipitated from amorphous matrix for the amorphous Al90Ni5Ce5 alloys, whereas the amorphous Al90Fe5Ce5 alloys is stable at room temperature. The stability of the structure corresponding to the prepeak strongly relates to the stability of the amorphous alloys.