Abstract
In the present study, the crystallization behavior of (Al90Y10)100−xSix (x = 0, 1, 2, 2.5 and 3 at%) amorphous alloys were characterized by differential scanning calorimetry, X-ray diffraction and transmission electron microscopy. As Si is added to the Al90Y10 base amorphous alloy, the primary crystallization of α-Al is advanced to lower temperature, the precipitation of Al4Y in the residual amorphous phase is depressed but the crystallization of Al3Y is promoted. The Si addition stabilizes the α-Al3Y phase significantly, due to which both the as-cast ingot and the fully crystallized ribbon of (Al90Y10)98Si2 alloy consist of α-Al and α-Al3Y, whereas the corresponding products in Al90Y10 alloy are α-Al and β-Al3Y. The addition of 2.5 at% Si makes the crystallization of α-Al split into two stages with a temperature interval of 140 K between the two peaks. The reason is thought to be related with the enhanced concentration fluctuation in amorphous alloy and the slower diffusion of Y atoms in crystallization after the Si addition.
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