The competition between plastic deformation mechanisms in FeCrCoNiAl_x high-entropy alloys is explored as a function of temperature by first-principle theory. Investigating the generalized stacking fault energy, we identify a strong interplay between the magnetic and chemical effects. At cryogenic conditions (ferromagnetic state), full-slip is accompanied by martensitic transformation, whereas increasing temperature towards room-temperature (paramagnetic state) changes the deformation mechanism to full-slip plus twinning. Alloying with Al reduces the susceptibility for stacking fault formation in the ferromagnetic state and promotes twinning in the paramagnetic state. The present advance in magneto-plasticity reveals new opportunities for tailoring the mechanical response in high-entropy alloys.

通过第一性原理研究了FeCrCoNiAl _x高熵合金中塑性变形机制之间的竞争与温度的关系。调查广义的堆垛层错能，我们确定了磁效应和化学效应之间的强烈相互作用。在低温条件下（铁磁状态），全滑动伴随马氏体相变，而向室温升高温度（顺磁状态）则将变形机制变为全滑动加孪晶。与Al合金化可降低在铁磁状态下堆积断层形成的敏感性，并促进在顺磁状态下孪晶。磁塑性的最新进展为调整高熵合金的机械响应提供了新的机会。