Al-Co-Er三元体系液相面投影图

Liquidus surface projection for the Al-Co-Er ternary system

在经济快速发展的今天,全球变暖和能源问题受到越来越多的重视。材料的轻量化、高性能化可以很好地节约资源、保护环境,促进资源的可持续发展。铝及铝合金是国防、国民经济各部门以及人们日常生活所需的重要材料,在航空航天和交通运输领域有重要应用,有关体系的相图研究能为设计高强度铝合金提供重要的基础数据,对该类材料的研发具有重要意义。本工作采用X射线衍射(XRD)、扫描电子显微镜(SEM)和电子探针(EPMA)等方法,对一系列Al-Co-Er铸态合金的凝固组织和相组成进行系统研究,共测得10个三元化合物相,建立了多条合金凝固通道;以此为基础,并结合文献中已报道的边际二元系相图绘制出Al-Co-Er三元体系的液相面投影图;推断出25个四相平衡反应,其中8个为三元共晶反应,17个为包共晶反应。

Recently,global warming and energy issues have attracted more and more attention,with the rapid economic development.In order to promote the sustainable development of resources light weight and high performance of materials can save resources and protect the environment.Aluminum alloys have important applications in the field of aerospace and transportation.The study of phase diagrams of related systems can provide important basic data for the design of high-strength aluminum alloys.The liquidus surface projections of the Al-Co-Er system were studied by X-ray diffraction(XRD),scanning electron microscopy(SEM)and electron probe micro-analysis(EPMA)techniques.A total of 10 ternary compound phases were measured and a number of alloy solidification channels were established.On this basis,the projection of liquidus in Al-Co-Er ternary system was constructed by combining with the phase diagram of binary system reported in literature.In conclusion,25 four-phase equilibrium reactions were deduced,of which 8 reactions were ternary eutectic and 17 reactions were ectoectic.