多主元合金（也称为高熵合金）是一种超级固溶体合金，具有优良的综合性能，如超高强度、超高的断裂韧性，高的耐磨耐蚀性、较低的模量、高的高温硬度，没有明显的韧脆转变温度等。因而，高熵合金正受到越来越多的关注。然而，目前对多主元合金的相形成规律和变形机制的基本问题还不清楚。对此，本课题将进行以下的研究：（1）系统研究高熵稳定相的形成热力学和动力学基础问题，预测高熵稳定相的形成和进行多组元合金的成分设计；（2）通过实验和计算机模拟相结合的方法，在原子尺度研究高熵稳定相的结构演化规律，分析多组元合金中高混合熵对相形成的作用，从而了解高熵稳定相的形成机理和相形成规律；（3）系统研究多组元高熵合金在不同条件下的机械性能，并从应力-应变曲线（载荷-位移），应力-时间曲线上细致分析不同测试温度、加载速率、样品尺寸条件下其锯齿变形行为及影响因素；（4）结合实验数据和计算机模拟结果深入研究多组元高熵合金的变形及断裂机理。

In the past decade, multi-principal element alloys , i.e. high-entropy alloys (HEAs), has attracted attention by many research groups across the world owing to their tailorable microstructures and promising properties, such as high strength, low elastic modulus and surprising thermal stability. However, up to now, the phase formation rule and deformation mechanism in multi-component HEAs are still unclear, because of the absence of information about multi-component alloys in phase diagrams and mechanical behavior. In the project, (1) the basis of thermodynamics and kinetics of phase formation in typical HEAs will be investigated, and the stability of high-entropy stabilized solid solution will be predicted; (2) combining experimental and computer simulation results, microstructure development of solid solution phase in atomic scale and the relationship between entropy of mixing and phase stability will be study, and the phase formation rule and mechanism will be better understood; (3) the mechanical behavior (compressive properties, tensile properties, high-temperature creep, fatigue behavior, etc.) of multi-component HEAs will be investigated, we will explore the serration behaviors on the stress-strain curves and stress-time curves, and study the serration behaviors at different testing temperature, loading rates, sample size, etc. (4) combining modeling and experimental results, a deep understanding of deformation mechanism of HEAs would be expected.