Chemical short-range order (CSRO) plays an important role in the mechanical properties of high-entropy alloys (HEAs). However, the research on the effect of CSRO on the mechanical properties of HEAs only focuses on the single-phase systems, which limits the control of mechanical properties for more HEAs by adjusting CSRO. In this work, the different effects of CSRO on the strength and ductility of single-phase and dual-phase HfNbTaZr are studied by the atomic-scale simulations. The results show that there are differences in the CSRO between single-phase and dual-phase systems. The strength of the single-phase system and dual-phase system both decrease by increasing the CSRO, which was caused by the more severe lattice distortion and higher enrichment degree in the Hf-Zr-rich region. A small amount of HCP (Hexagonal Close Packed) structure plays a role in dispersion strengthening, so the dual-phase system with low CSRO has high strength. The distribution of the Hf-Zr-rich region and the proportion of HCP structure are important factors affecting the ductility. The system, with evenly distributed Hf-Zr-rich regions and a small amount of HCP structure, has better strength and ductility.

化学短程有序 (CSRO) 在高熵合金 (HEA) 的力学性能中起着重要作用。然而，CSRO对HEAs力学性能影响的研究仅集中在单相体系，限制了通过调节CSRO对更多HEAs力学性能的控制。在这项工作中，通过原子尺度模拟研究了 CSRO 对单相和双相 HfNbTaZr 强度和延展性的不同影响。结果表明，单相和双相系统的CSRO存在差异。单相体系和双相体系的强度均随着 CSRO 的增加而降低，这是由于富 Hf-Zr 区域晶格畸变更严重，富集程度更高所致。少量的HCP（Hexagonal Close Packed）结构起到弥散强化作用，因此低CSRO的双相体系具有较高的强度。富Hf-Zr区域的分布和HCP结构的比例是影响延性的重要因素。该体系富Hf-Zr区域分布均匀，HCP结构量少，具有较好的强度和延展性。