快速凝固共晶铝硅合金的组织特征及形成机理
Microstructures and Formation Mechanism of Rapidly Solidified
高雪刚,谢敬佩,王爱琴,任常飞
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作者单位：1.河南科技大学 材料学院，河南 洛阳 471003; 2. 河南省有色金属材料科学与加工技术重点实验室
中文关键字：快速凝固；微观组织；微纳米晶；共晶合金
英文关键字：rapid solidification; microstructure; micro-nanocrystal; eutectic alloy
中文摘要：利用单辊甩带方法制备Al-12.6Si多元合金快速凝固条带，采用扫描电镜、透射电镜和DSC技术，对合金组织形貌、相结构进行了表征。结果表明：快速凝固不仅使合金组织细化，形成微纳米晶，并能使组织和相结构发生变化, 形成了大量的α-Al等轴晶和少量的羽毛针列状共晶体组织。
英文摘要：The rapidly solidified alloys strips with Al-12.6Si were prepared by single roller melt-spinning method. The microstructures, phase and morphology characteristics of the strips were characterized by means of SEM, TEM and DSC technique. The results show that the grains refine after rapid solidification, and the micro-nanocrystals form, the morphology characteristics change; the microstructures of the strips are composed of primary micro-nanostructure α phase and feather-needles-like (α+Si) eutectic.