采用3m小型落管实现了Ag—28．1（质量分数，％下同）Cu共晶合金的微重力快速凝固，在高纯He和Ar的混合气氛中获得的合金小球直径在80—1000mm范围内．随着小球直径的减小，晶粒及层片共晶得到细化，凝固组织由层片共晶向不规则共品转变．TMK快速共晶生长理论的计算结果显示，Ag—28．1Cu层片共晶的最大生长速度、最小层片间距和最大过冷度分别为0．291m／s，0．017μm和193K．
Spherical particles of Ag-28.1Cu eutectic alloy with a wide range of diameters from 80 to 1000 μm were produced using a 3 m drop tube. It was revealed that a "lamellar eutectic → anomalous eutectic" transition occurred with decreasing drop diameter. The results of TMK model indicated that the maximum growth velocity, the minimum interlamellar spacing, and the largest undercooling of Ag-28.1Cu alloy for regular lamellar eutectic growth were 0.291 m/s, 0.017 μm and 193K respectively. A conspicuous grain refinement effect took place as droplet size decreased. The minimum measured eutectic interlamellar spacing was 0.092 μm, corresponding to a calculated eutectic growth velocity of 9.6 mm/s.
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