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Microstructure Evolution in Rapidly Solidified Immiscible Alloys

机译:快速凝固的不混溶合金的微观结构演变

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We prepared Al-Bi alloys with our new aerogel counter gravity casting facility and Al-Pb alloys by simple mould casting with variable cooling rates. By counter gravity casting, it is possible to have directional solidification with flat isotherms and without forced melt flow during the casting process. Both methods allow studying the nucleation rate in liquid-liquid decomposition. The most important result is that a separation between monotectic and hypermonotectic particles is possible by using suitable cooling rates. The difference of the frequency maxima is a function, depending on cooling rate and starting composition. By casting experiments with variable cooling rates, we found that the average particle diameter is a function of the cooling rate, according to the theory of Ratke and Zhao, but the nucleation rate is higher than assumed in their theory.
机译:我们使用新的气凝胶反重力铸造设备制备了Al-Bi合金,并通过具有可变冷却速率的简单铸模法制备了Al-Pb合金。通过反重力铸造,可以在平坦的等温线下进行定向凝固,并且在铸造过程中没有强制的熔体流动。两种方法都允许研究液-液分解中的成核速率。最重要的结果是,可以通过使用合适的冷却速率来分离单晶和过单晶颗粒。频率最大值的差异是一个函数,取决于冷却速率和起始成分。根据Ratke和Zhao的理论,通过铸造具有可变冷却速率的实验,我们发现平均粒径是冷却速率的函数,但是成核速率高于其理论中的假设。

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