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研究了Ｐｄ４０Ｎｉ４０Ｐ２０合金在重力（１ｇ）及微重力（μｇ）条件下凝固组织中溶质原子的分布．与重力条件相比，微重力条件下凝固的样品组织中，初生相的Ｐ含量较低，而Ｐｄ的含量较高；共晶区域内的平均Ｐ含量较高而平均Ｐｄ含量较低．深入分析初生树枝晶一次枝晶间距Ｌ与冷却率υ以及固液界面前沿液相中溶质综合输运系数Ｄ的相互关系，发现地面条件下的固液界面前沿液相中溶质综合输运系数Ｄ１ｇ比空间的Ｄμｇ大１７倍．这是造成显微组织中溶质分布差异的主要原因
The distribution of solute atoms in Pd40Ni40P20 alloy under the conditions of gravity (1g) and microgravity (μg) was investigated. Compared with the gravitational conditions, the content of P in the primary phase and the content of Pd in the solidified sample under the microgravity condition are relatively low, while the average P content and the average Pd content in the eutectic region are lower. In-depth analysis of the primary dendrite primary dendrite spacing L and cooling rate υ and solid-liquid interface in front of liquid phase solute transport coefficient D correlation found that the liquid-solid interface in front of the liquid solute transport coefficient D1g Df than space 1 7 times larger. This is the main reason for the difference in solute distribution in the microstructure