The effect of cold rolling on the structure and mechanical properties of the HfNbTaTiZr refractory high‐entropy alloy with a single body‐centered cubic (BCC) phase structure is studied. The microhardness evolution during cold rolling to the thickness strain ε_th = 80% shows three distinct stages: an increase till ε_th ≈ 15%, a plato in the interval ≈15–40%, and again some increase at ε_th ≥ 40%. This behavior is found to be associated with an increase in dislocation density at the first stage, the formation of kink bands at the second stage, and the development of shear bands with fine lamellar internal substructure at the third stage. After cold rolling to 80%, the alloy demonstrates the yield strength of 1220 MPa, peak strength 1320 MPa, and elongation to fracture 3.4%. A short steady‐state flow stage is observed on the engineering stress–strain curve that can also be associated with kinking.

中文翻译：

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HfNbTaTiZr难熔高熵合金冷轧过程中的组织和力学性能演变

研究了冷轧对具有单心心立方（BCC）相结构的HfNbTaTiZr难熔高熵合金的组织和力学性能的影响。冷轧中的显微硬度演变到厚度应变ε_个 = 80只％示出了三个不同的阶段：增加直到ε_第 ≈15％，在区间≈15-40％一柏拉图，并再次增加一些在ε_第 ≥40％。发现此行为与第一阶段的位错密度增加，第二阶段的扭结带的形成以及第三阶段的具有精细层状内部子结构的剪切带的发展有关。冷轧至80％后，该合金的屈服强度为1220 MPa，峰值强度为1320 MPa，断裂伸长率为3.4％。在工程应力-应变曲线上观察到短暂的稳态流动阶段，也可能与扭结相关。