This paper reported the effect of Cr addition on microstructure, phase constitutes and mechanical properties of the Hf_0.5Mo_0.5NbTiZr refractory high-entropy alloy. The Cr_xHf_0.5Mo_0.5NbTiZr (x = 0.1, 0.2, 0.3, 0.4 and 0.5) alloys were composed of one BCC solid solution phase and one CrMoZr-typed Laves phase. This alloy system exhibited the typical dendritic structure after casting. The dendritic structure was refined with the Cr addition. The strength of Cr_xHf_0.5Mo_0.5NbTiZr alloys increased and the plasticity also was improved with small amount addition of Cr elements, the strength continued to increase while the plasticity decreased as the concentration of Cr element increased. The homogenization treatment promoted more formation of Laves phase, which significantly increased the strength.

本文报道了Cr的添加对Hf _0.5 Mo _0.5 NbTiZr难熔高熵合金的组织，相组成和力学性能的影响。Cr _x Hf _0.5 Mo _0.5 NbTiZr（x = 0.1、0.2、0.3、0.4和0.5）合金由一种BCC固溶体相和一种CrMoZr型Laves相组成。该合金体系在铸造后表现出典型的树枝状结构。通过添加Cr来细化树枝状结构。Cr _x Hf _0.5 Mo _0.5的强度随着Cr元素含量的增加，NbTiZr合金含量增加，塑性也得到提高，强度不断提高，而塑性下降。均质化处理促进了Laves相的更多形成，从而显着提高了强度。