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中文摘要：
研究了Cu-Pb偏晶合金的急冷快速凝固和组织形成规律，并通过将金属熔体的热传导方程和Navier-StokeB方程相耦合，理论分析了合金熔体的冷却速率、液固相变时间等物理参量与液相分离之间的相关性．研究结果表明，在急冷快速凝固条件下，熔体的快速冷却对偏晶合金组织形成的影响要比熔体内部液相流动的影响更为显著．快速凝固使液相分离受到抑制，Cu-Pb偏晶合金均可获得均匀的微观组织结构．随着冷速的增大，晶粒尺寸明显减小，凝固组织显著细化，晶体形态由粗大枝晶向均匀细小的等轴晶过渡．提高冷却速率，缩短液固相变时间是重力场中抑制液相分离、获得均匀偏晶组织结构的重要条件．
英文摘要：
The rapid solidification and microstructui＇e formation of Cu-Pb monotectic alloy were investigated by melt spinning method. The relationship between liquid separation and physical parameters such as cooling rate and solidification time etc. was analyzed theoretically by coupling the heat transfer equation and Navier-Stokes equation. It is revealed that the rapid cooling of the melt has more remarkable effect on microstructure forming of the monotectic alloys than liquid flow under rapid solidification. The rapid solidification can suppress the liquid separation, which results in the formation of uniform microstructure for various Cu-Pb monotectic alloys. With the rise of cooling rate, the grain size clearly decreases, the microstructure was markedly refined and the microstructural morphology changes from coarse dendrite to uniform and fine equiaxial crystallites. Increasing the cooling rate and shortening solidification time are the essential conditions to suppress liquid phase separation and obtain the uniform monotectic microstructure in gravitv field.
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