Abstract
Cu-15%Co alloys have been synthesized by an induction furnace adopting electromagnetic stirring (EMS). The liquid-liquid separation behavior and the peritectic reaction under a forced melt flow were analyzed. The specimens were subjected to a conventional induction melting as well as enhanced melt stirring by a two-side electromagnetic stirrer. The stirred ingots showed a significant improvement in dispersivity and homogeneity of the Co-rich phase. Comparing the specimens subjected to different current intensities, we observed strong changes in the phase fraction, the degree of segregation, and the grain size. EMS had an effect of reducing the amount and size of Co-rich droplets and enhancing the amounts of small equiaxed dendrites and dendrite fragments, which led to a more dispersive distribution of α-Co phase and refined the grains of Cu-rich phase. We observed a considerable increase in the fraction of peritectic Cu-rich phase with increasing current intensity of EMS, indicating that the peritectic reaction was promoted by EMS. EMS also reduced the macrosegregation of Co-rich phase in both the vertical and radial direction of the ingot when the current intensity was appropriate.
Highlights
The solidification of immiscible alloys has always been a hard target for researchers because immiscible alloys are easy to form serious segregation, which is caused by a miscibility gap in the phase diagram
We have studied the effect of electromagnetic stirring (EMS) on the liquid-liquid separation and the peritectic reaction of
WeCu-Co haveimmiscible studied the effect on the liquid-liquid separation and the peritectic reaction of alloys, the of main conclusions can be summarized as follows: The EMSalloys, reduced themain amount and size of can liquid droplets as during solidification, and the
Summary
The solidification of immiscible alloys has always been a hard target for researchers because immiscible alloys are easy to form serious segregation, which is caused by a miscibility gap in the phase diagram. Because of the liquid-liquid separation, immiscible alloys are hard to be fabricated by conventional solidification. Since many immiscible alloys have good physical and chemical properties, these alloys have been studied for decades with different fabrication methods, such as the directional solidification [1,2], the rapid solidification [3,4], the solidification under microgravity in the space [5,6]. A homogenous structure was still hard to achieve in a bulk-size immiscible alloy by solidification, which limited its mass production and application. The melt-spun Cu100-x -Cox alloys showed granular structures consisting of magnetic particles after annealing [14]. Cu-Co thin films prepared by DC magnetron sputtering consisted of ultrafine Co-rich precipitate particles in a Cu-rich matrix [15]
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