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快速凝固是指在大于10~5~10~6度/秒的冷却速度下,金属或合金从液态转变为固态的过程.在铸造生产中,冷却速度对铸造合金的组织与性能有很大的影响,但是现有的铸造方法所提供的冷却速度一般不超过10度/秒.合金在极快的冷却速度下(＞10~5~10~6度/秒)凝固时,组织结构特征如何?本文是作者以透射电子显微镜为主要研究手段,对快速凝固的Al—18Cu合金(所标数字为原子百分比,下同)进行观察与分析的结果.
Rapid solidification refers to the process of the transformation of a metal or an alloy from a liquid state to a solid state at a cooling rate of more than 10 to 5 to 10 to 6 degrees per second In the casting production, the cooling rate has a great influence on the microstructure and properties of the cast alloy However, the cooling rate provided by the existing casting methods generally does not exceed 10 ° C. The microstructure characteristics of the alloy when it is solidified at a very fast cooling rate (> 10~5~10~6 degrees / sec) This article is the author of transmission electron microscopy as the main research methods, the rapid solidification of Al-18Cu alloy (the number is atomic percent, the same below) were observed and analyzed the results.