对Al-Pb合金开展了高压气体雾化快速凝固实验，金相观察表明粉末表面具有一Pb富集层。建立了描述雾化液滴凝固组织演变的数学模型，模拟分析了液滴凝固过程，结果表明，富Pb表层的形成因为在液-液相变过程中富Pb液相在雾化液滴表面发生异质形核导致的。
High pressure gas atomization experiments were done with Al-Pb immiscible alloy. Powders with a Pb-rich shell on their surfaces were obtained. A model describing the microstructure evolution in Al-Pb atomized droplet was developed. The solidification process was calculated. The results indicate that the formation of the shell-type structure is due to the heterogeneous nucleation of the Pb-rich phase on the atomized drop surface.
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