High entropy alloys (HEAs) have attracted great attention due to their impressive properties induced by the severe lattice distortion in comparison to the conventional alloys. However, the effect of severe lattice distortion on the mechanical properties in face-centered-cubic (FCC) and body-centered-cubic (BCC) structured HEAs is still not fully understood, which are critically important to the fundamental studies as well as the industrial applications. Herein, an analytical model for predicting the solid-solution strengthening and the yield stress in FCC and BCC HEAs accounting for the lattice distortion is presented. Both the calculated solid-solution strengthening and the yield strength are compared to the experimental results, to verify the rationality of the built theoretical model. The numerical predictions considering the severe lattice-distortion effect agree well with the experimental results for both FCC and BCC HEAs, in terms of the yield strength and the solid-solution strengthening. Based on theoretical model, the constructed contour line of solid-solution strengthening can be used to evaluate the effect of elemental type on yield strength of HEAs, which provides guideline for discovering and screening the advanced HEAs. Furthermore, it has been identified the atomic-radius mismatch and solid-solution strengthening do not increase directly as the number of components increases in HEAs based on the theoretical analysis. In the Al_x-Cr-Co-Fe-Ni-Mn HEA system, the atomic-radius mismatch and shear-modulus mismatch induced by the added Al element govern the solid-solution strengthening, but this situation disappears in the Al_x-Hf-Nb-Ta-Ti-Zr HEA system. It is further confirmed that the effect of the atomic-radius mismatch on the solid-solution strengthening is obviously higher than effect of the shear-modulus mismatch, dominating the yield strength. These results provide an insight into the effect of severe lattice distortion on the yield strength, and demonstrate a theoretical framework for identifying the desired compositions to create the excellent HEAs.

与传统合金相比，高熵合金（HEA）由于严重的晶格畸变而引起了令人印象深刻的性能，因此备受关注。然而，严重的晶格畸变对面心立方（FCC）和体心立方（BCC）结构的HEA的机械性能的影响仍未完全了解，这对于基础研究和基础研究至关重要。工业应用。在此，提出了一种用于预测FCC和BCC HEA中固溶强化和屈服应力的分析模型，该模型考虑了晶格畸变。将计算得到的固溶强化和屈服强度与实验结果进行比较，以验证所建立理论模型的合理性。在屈服强度和固溶强化方面，考虑到严重的晶格畸变效应的数值预测与FCC和BCC HEA的实验结果非常吻合。基于理论模型，构造的固溶强化轮廓线可用于评价元素类型对HEA屈服强度的影响，为发现和筛选高级HEA提供指导。此外，基于理论分析，已经发现，随着HEA中组分数量的增加，原子半径失配和固溶强化不会直接增加。在铝 所建立的固溶强化轮廓线可用于评估元素类型对HEA屈服强度的影响，为发现和筛选高级HEA提供指导。此外，基于理论分析，已经发现，随着HEA中组分数量的增加，原子半径失配和固溶强化不会直接增加。在铝 所建立的固溶强化轮廓线可用于评估元素类型对HEA屈服强度的影响，为发现和筛选高级HEA提供指导。此外，基于理论分析，已经发现，随着HEA中组分数量的增加，原子半径失配和固溶强化不会直接增加。在铝_x -Cr-Co-Fe-Ni-Mn HEA体系中，添加的Al元素引起的原子半径失配和剪切模量失配决定了固溶强化，但这种情况在Al _x -Hf-Nb-中消失了。Ta-Ti-Zr HEA系统。进一步证实，原子-半径失配对固溶强化的影响明显高于剪切模量失配的影响，主导了屈服强度。这些结果提供了对严重晶格畸变对屈服强度的影响的洞察力，并证明了用于鉴定所需组成以产生优异的HEA的理论框架。