共晶高熵合金研究进展

高熵合金(HEAs)打破了传统合金的设计理念,是以多种主要元素组成的一类新型合金,但大部分高熵合金通常流动性和可铸造性较差,成分不均匀,不利于高熵合金的规模化应用。共晶高熵合金(EHEAs)可同时具有高熵合金和共晶合金的特性,减少铸造缺陷,改善了铸造性能,设计和制备共晶高熵合金具有重要的意义。概述了国内外共晶高熵合金的研究进展,介绍了合金的相组成和性能,共晶形貌的生长特征及生长机理,概括了共晶高熵合金的相形成规律和共晶成分的设计方法,最后展望了未来共晶高熵合金的主要研究方向。

Research Progress in Eutectic High Entropy Alloys

High-entropy alloy(HEA),which breaks the design concept of traditional alloy,is a new type of alloy composed of multiple main elements.However,most high-entropy alloys usually have poor fluidity and castability as well as larger compositional unevenness,which is adverse to the large-scale industrial application.Eutectic high-entropy alloys(EHEAs)exhibit the characteristics of high-entropy alloys and eutectic alloys simultaneously,which can reduce casting defects and have unique advantages in high-temperature application.Therefore,it is of great significance to design and preparation of eutectic high-entropy alloys.The research progress of melting eutectic high-entropy alloys at home and abroad was reviewed.The phase composition and properties of the alloys as well as the growth characteristics and mechanism of the eutectic morphology were introduced.Subsequently,the phase formation law of eutectic high-entropy alloy and the design method of eutectic composition were summarized.Finally,the forward research direction of eutectic high-entropy alloy was prospected.