Abstract
In this work, the glass-forming ability of DyCoAl bulk metallic glass (BMG) was improved by microalloying Si element. Centimeter-level Dy-based BMG was prepared with the addition of 1 at% Si at the expense of Al element. Distinctions of crystallization behavior induced by Si addition for the Dy55Co20Al25 BMG were investigated in terms of isochronal and isothermal crystallization as well as time dependent crystallization. Compared with the Dy55Co20Al25 BMG, the nucleation process changes to a suppressed nucleation with 1 at% Si addition, and then to an explosive nucleation with 3 at% Si addition accompanying the precipitation of Si-containing phases. Meanwhile, the growth of crystalline particle is sluggish for Dy55Co20Al24Si1 BMG whereas turns to rapid for Dy55Co20Al22Si3 BMG. These distinctions of crystallization behavior are attributed to the interplay of driving force for crystallization and kinetic fragility of supercooled liquid. This work provides guidance to modulate the magnetocaloric effect of Dy-based BMGs through crystallization treatment.
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