难熔高熵合金研究进展

高熵合金是近年来的新兴领域,与传统合金不同,其一般是由五种或者五种以上主要元素组成,每种主元的含量在5%~35%(原子分数)之间,多种元素混乱排列却拥有简单的相结构,高熵合金的优点显著,发展空间巨大。以难熔金属元素为基础的难熔高熵合金近年来大受关注,含有3种及以上的难熔金属组成的高熵合金称为难熔高熵合金,由于难熔金属的熔点均较高,因此难熔高熵合金表现出了较好的高温力学性能和高温抗氧化性能以及耐腐蚀性能,受到大众欢迎,有望取代传统的高温合金。详细的阐述了难熔高熵合金的制备方法、相结构、力学性能、抗氧化性能与耐腐蚀性能,最后对难熔高熵合金的发展进行了展望。

Research progress of refractory high-entropy alloys

High entropy alloys are emerging field in recent years.Different from traditional alloys,they are generally composed of five or more major elements,with the content of each principal element ranging from 5%to 35%(atomic fraction).Many elements are disordered but have simple phase structure.High entropy alloys have obvious advantages and huge development space.Refractory metal based refractory high entropy alloys have great concern in recent years.Refractory metal alloy with three or more high entropy is called refractory high entropy alloys.Due to the high melting point of refractory metal,the refractory high entropy alloys show good high temperature mechanical properties,high temperature oxidation resistance and corrosion resistance,which are welcomed by the mass and expected to replace the traditional high temperature alloy.In this paper,the preparation method,phase structure,mechanical properties,oxidation resistance and corrosion resistance of refractory high entropy alloys are described in detail.Finally,the development of refractory high entropy alloys are prospected.