Theoretical modeling of toughening mechanisms in the CrMnFeCoNi high-entropy alloy at room temperature

•Twinning-induced nanocrack initiation near a main crack tip is modeled.•A new model for crack bridging due to plastically elongated nanobridges.•A new model is suggested that describes the effect of GB structures on toughness.•Effect of crack deflection on stress field and crack growth is discussed.