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Abstract
The influences of undercooling rate and cooling rate on the microstructural evolution of ternary Cu45Zr45Ag10 alloy using single-roller melt spinning and drop tube are investigated. The rapidly quenched alloy ribbons achieve a homogeneous glass structure. The microstructure of the droplets transforms from the Cu10Zr7 dendrites plus (Cu10Zr7 + AgZr) eutectic into Cu10Zr7 dendrite with the decrease of droplet diameter. As the diameter decreases to 180 μm, the Cu45Zr45Ag10 alloy changes from crystal to amorphous structure, showing that the cooling rate is not the only influence factor and the undercooling play a certain role in the forming of the amorphous alloy at the same time under microgravity condition.
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