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采用落管方法实现了Sb-24％Cu合金在微重力和无容器条件下的快速共晶生长.对自由落体条件下的晶体形核和共晶生长进行了研究,发现随着过冷度的增大,共晶生长由层片共晶向不规则共晶转变.实验中获得了 0～154 K的过冷度,最大过冷度达到 0.19TE.计算结果表明,金属间化合物 Cu2Sb是领先形核相;当过冷度大于40 K时,Sb枝晶的生长速度将超过共晶生长速度;此共晶体系的共生区强烈地偏向于Cu2Sb一方,其成分范围为23.0％～32.7％Sb.
The rapid eutectic growth of Sb-24% Cu alloy under microgravity and vessel-free conditions was achieved by drop-tube method.The crystal nucleation and eutectic growth under free-fall conditions were studied and found that with the undercooling And the eutectic growth changes from lamellar eutectic to irregular eutectic.In the experiment, the undercooling of 0 ~ 154 K was obtained and the maximum undercooling reached 0.19TE.The calculated results show that the intermetallic compound Cu2Sb is the leading form When the degree of undercooling is greater than 40 K, the growth rate of Sb dendrites will exceed the eutectic growth rate. The symbiosis zone of this eutectic system strongly favors the Cu2Sb side with the composition range of 23.0% -32.7% Sb.