Reactions of $\left\{10\overline{1}1\right\}$ twin boundaries (TBs) with slip dislocations and evolution of associated steps at TBs in a Mg alloy were investigated and modeled, based on atomic-resolution observations and theory of interfacial defects. It was found that reactions between $\left\{10\overline{1}1\right\}$ TBs and low-angle grain boundaries composed of basal mixed $1/3〈11\overline{2}0〉$ dislocations (referred to as $〈{\mathbf{a}}_{60}〉$) could produce asymmetric tilt grain boundaries. Each $〈{\mathbf{a}}_{60}〉$-TB reaction created a step with a ${\mathbf{b}}_{\pm 3/\pm 2}$-type residual dislocation and a two-layer twinning dislocation (TD) gliding away. A one-layer step with a ${\mathbf{b}}_{\pm 1/\pm 1}$-type residual dislocation could be generated either by the reaction of an $〈{\mathbf{a}}_{60}〉$ or a $〈\mathbf{c}+{\mathbf{a}}_{\mathrm{s}}〉$ dislocation from one side of a $\left\{10\overline{1}1\right\}$ TB with another $〈{\mathbf{a}}_{60}〉$ dislocation from the other side, or through direct reaction with the $\left\{10\overline{1}1\right\}$ TB, emitting another $〈{\mathbf{a}}_{60}〉$ dislocation into the other side. Local atomic structures of steps at $\left\{10\overline{1}1\right\}$ TBs could be modified by either emission of or reaction with TDs, $〈{\mathbf{a}}_{60}〉$, $〈\mathbf{c}+{\mathbf{a}}_{60}〉$ or $1/6〈20\overline{2}3〉$ Frank partial dislocations, reducing local lattice strains at steps. Our experimental results may provide insights for understanding the plastic relaxation mechanisms at $\left\{10\overline{1}1\right\}$ TBs.

的反应 $\left\{10\overline{\mathrm{1个}}\mathrm{1个}\right\}$基于原子分辨观察和界面缺陷理论，研究和建模了具有滑脱位错的孪晶边界（TBs）和Mg合金中TBs的相关台阶的演化。发现之间的反应$\left\{10\overline{\mathrm{1个}}\mathrm{1个}\right\}$ TBs和低角度晶界由基础混合组成 $\mathrm{1个}/3〈11\overline{2}0〉$ 脱位（简称为 $〈{\mathbf{一种}}_{60}〉$）可能会产生不对称的倾斜晶界。每$〈{\mathbf{一种}}_{60}〉$结核病反应创造了一个步骤 ${\mathbf{b}}_{\pm 3/\pm 2}$型残余位错和两层孪晶位错（TD）滑移。一层的步骤${\mathbf{b}}_{\pm \mathrm{1个}/\pm \mathrm{1个}}$型残余位错可能是由于 $〈{\mathbf{一种}}_{60}〉$ 或一个 $〈\mathbf{C}+{\mathbf{一种}}_{\mathrm{s}}〉$ 从一个侧面脱臼 $\left\{10\overline{\mathrm{1个}}\mathrm{1个}\right\}$ 结核与另一个 $〈{\mathbf{一种}}_{60}〉$ 从另一侧脱臼，或通过与 $\left\{10\overline{\mathrm{1个}}\mathrm{1个}\right\}$ 结核病，正在散发另一个 $〈{\mathbf{一种}}_{60}〉$脱臼到另一侧。步骤处的局部原子结构$\left\{10\overline{\mathrm{1个}}\mathrm{1个}\right\}$ 可以通过排放或与TD反应来改变TB， $〈{\mathbf{一种}}_{60}〉$， $〈\mathbf{C}+{\mathbf{一种}}_{60}〉$ 要么 $\mathrm{1个}/6〈20\overline{2}3〉$弗兰克局部位错，逐步减少了局部晶格应变。我们的实验结果可能会提供一些见解，以了解在$\left\{10\overline{\mathrm{1个}}\mathrm{1个}\right\}$ 结核病。