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.