Rapid eutectic growth during free fall |
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Authors: | Wenjing Yao Xiujun Han Bingbo Wei |
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Institution: | (1) Laboratory of Materials Science in Space, Department of Applied Physics, Northwestern Polytechnical University, 710072 Xi’an, China |
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Abstract: | Rapid eutectic growth of Sb-24%Cu alloy is realized in the drop tube during the free fall under the containerless condition.
Based on the analysis of crystal nucleation and eutectic growth in the free fall condition, it is indicated that, with the
increase of undercooling, microstructural transition of Sb-24%Cu eutectic alloy proceeds from lamellar to anomalous eutectic
structure. Undercoolings of 0 –154 K have been obtained in experiment. The maximum undercooling exceeds to 0.19Te. Calculated results exhibit that Cu2Sb compound is the primary nucleation phase, and that the primary Sb dendrite will grow more rapidly than the eutectic structure
when undercooling is larger than 40 K. The eutectic coupled zone around Sb-24%Cu eutectic alloy leads strongly to the Cu-rich
side and covers a composition range from 23.0% to 32.7%Sb. |
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Keywords: | drop tube microgravity eutectic growth eutectic coupled zone high undercooling |
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