High-cycle fatigue tests were performed on differently deep rolled conditions of the equiatomic high-entropy alloy (HEA) CoCrFeMnNi. Twinning in the near-surface layer of specimens deep rolled at cryogenic temperature is revealed by electron-backscatter diffraction. As internal failure mode and similar fatigue lives are found irrespective of the deep rolling temperature, these twins are not expected to significantly contribute to the fatigue properties of the surface treated HEA. S-N curves of the initial state and deep rolled conditions revealed a point of intersection at low stress amplitudes. This unexpected behaviour is explained based on the interplay of several characteristics of the near-surface layers.

在等原子高熵合金 (HEA) CoCrFeMnNi 的不同深轧条件下进行高周疲劳试验。电子背散射衍射揭示了在低温下深轧的试样近表面层中的孪晶。由于内部失效模式和类似的疲劳寿命与深轧温度无关，因此预计这些孪晶不会对表面处理的 HEA 的疲劳性能产生显着影响。初始状态和深轧条件的 SN 曲线显示在低应力幅度处有一个交点。这种意想不到的行为是基于近地表层的几个特征的相互作用来解释的。